Answer:
The correct answer is a. the photosynthetic part of a lichen.
Explanation:
Lichen is a symbiotic association in which the algae and fungi are associated with each other. Fungus can not make there own food so they are not photosynthetic like algae or plants and in lichens algae are the photosynthetic part while fungus plays the role of absorbing nutrients for the algal partner.
Lichens are found all over the world and they absorb industrial pollution very quickly so are also referred to as pollution indicators of the environment as they do not grow in a polluted area.
Therefore the photosynthetic part of lichen is algae, not fungus so the correct answer is a.
which best describes food when it reaches the stomacg
Answer:
The polysaccharides have been broken down.
Explanation:
The polysaccharides have been broken down in to monosaccharides by the process of hydrolysis to make them small particles which can be easily absorbed by the body .
Parents with the dominant phenotype cannot have offspring with the recessive phenotype.
Answer:
False, they can have recessive phenotype
Explanation:
A phenotype is a viable characteristic an individual presents as a consequence of the interaction between its environment and its genotype.
This doesn’t necessarily means that the individual’s aleles are both dominant (homozygotes), they could have one dominant and one recessive gen (heterozygotes), meaning that, if the another parent is homozygote with both recessive aleles the offspring could heritage homozygote recessive aleles that will result in a recessive phenotype.
You can observe in the image I added a punnet square that exemplifies the scenario. You can see that the offspring has 1/2 probability to have recessive phenotype.
I hope you find this information useful and interesting! Good luck!
Answer:
75% and 25%
Explanation:
Which of the following correctly displays the sequence of developmental milestones?A) blastula → gastrula → cleavageB) cleavage → gastrula → blastulaC) cleavage → blastula → gastrulaD) gastrula → blastula → cleavage
Cleavage → blastula → gastrula correctly displays the sequence of developmental milestones
Explanation:
In first step of developmental milestone, the zygote undergoes cell cleavage to form a spherical balls of cells, that are known a blastula. This blastula are filled with fluid called blastoderm at the centre. Later the balausta arranges itself in double layer out of which the inner one becomes the zygote and the outer one is placenta. After this stage the blastula folds itself into several layers i.e. germ layers which will give rise to the internal structure of living being. These germ layers are ectoderm, endoderm, mesoderm.
C) The sequence of developmental milestones in embryonic development is cleavage, blastula, and then gastrula.
Initially, the cleavage is the series of mitotic cell divisions of a fertilized egg, or zygote, that leads to a multicellular stage. After cleavage, these cells rearrange to form a hollow ball of cells known as the blastula. The blastula then undergoes a process known as gastrulation, where it folds inward to form a three-layered structure called the gastrula, which will further differentiate into various tissues and organs during the subsequent stages of development.
During embryonic development, unique cell layers develop and differentiate during a stage known as the gastrula stage. These layers, termed germ layers, give rise to the different organs and tissues in the body.
Thirty people are selected for a long-term mission to colonize a planet many light-years away from Earth. The mission is successful and the population rapidly grows to several hundred individuals However, certain genetic diseases are unusually common in this group, and the group's gene pool is quite different from that of the Earth population they have left behind. Which of the following phenomena has left its mark on this population?a.founder effectb.adaptive effectc.high rates of mutationd.natural selection
Answer:
The correct answer will be Option- founder effect
Explanation:
The founder effect is the effect observed in a population caused by the loss of the genetic variation. The genetic variation is lost as a result of the establishment of the new population caused by the migration of the few numbers of individuals from a larger population.
This loss of genetic variation leads to variation in the genotype and phenotype of the newly established population.
Since in the given question the gene pool of the new population on the new planet is different from the parent population leads to a phenomenon called founder effect.
Thus, the founder effect is the correct answer.
Lymph found only when there is a pathological condition that allows it to leak from capillaries ____.
a. is excess interstitial fluid.
b. is filtered by the spleen.
c. is synthesized by the lymphoid organs.
d. All of the choices are correct.
Answer: All of the choices are correct.
Explanation:
Schamberg's disease is the pathological condition that allows lymph to leak from the blood capillaries, it causes no other symptoms beside skin discoloration and itching. The condition is caused by inflammation of capillaries near the surface of skin and subsequent leaking of blood cells into surrounding tissues.
So, the Lymph found in this patholgical condition is a fluid that circulates the entire body in the lymphatic system. The lymphoid organs include (the spleen, lymph nodes, bone marrow, thymus and lymph tissue) . These lymph nodes are small, bean-shaped structures which produce and store cells, specialized in fighting infections.
In the spleen (an organ in the upper left abdomen, filtration of these blood and disposal of worn-out blood cells occurs ), Hence, provides a reserve supply of blood.
However, Fluid in the spaces between the tissues are called interstitial fluid (tissue fluid). They provides the cells of the body with nutrients (via the blood supply) and a means of waste removal.
As such, Lymph is formed when the interstitial fluid is collected through tiny lymph capillaries, which are located throughout the body. It is then transported through lymph vessels to lymph nodes, which clean and filter it. Lymph then flows on to the lymphatic ducts, before emptying into the right or the left subclavian vein, where it mixes back with blood.
How does a gastrovascular cavity differ from an alimentary canal? The gastrovascular cavity __________.
a. absorbs food molecules but does not produce digestive
b. enzymes has only a single opening
c. stores food but does not digest
d. it is the location for extracellular digestion
Answer:
The answer is C.
Explanation:
Some characteristics of DNA are shared between all living organisms, whereas other characteristics of DNA differ between organisms. Classify DNA characteristics as either being a universal attribute of DNA or an attribute of DNA that is unique to particular individuals or species.
Explanation:
Universal: made up of nucleotides (A T C G), forms codons of three nucleotides, each encodes an amino acid
Species or Individual: size of the genome, sequence of DNA
The nucleus is a large membrane-bound organelle that houses the genetic information, DNA, in the cell. Sequences of DNA make up genes which can have different forms called alleles and comprise the genotype. DNA is transcribed into mRNA and later translated into amino acids which are linked together by rRNA to form proteins. These proteins, when expressed, are referred to as an organism's phenotype.
Further Explanation:
All the genetic information within the eukaryotic cell is stored within the nucleus as helical DNA. This DNA is tightly wound around histones as chromosomes. Chromosomes within the nucleus is unwound, unzipped and read by enzymes in a complex series of steps known as transcription. The message on DNA, called genes is copied by RNA polymerase, to form mRNA complementary sequence to that of the DNA strand. These are then translated into proteins in ribosomes.
Large chains of monomers form biological macromolecules which carry out many essential functions in the body these can include nucleic acids, carbohydrates, proteins and lipids. These are organic molecules, meaning they're ringed or long-chain Carbons bonded to the elements oxygen (O), hydrogen (H), nitrogen (N) and phosphorus (P).
Proteins are structural support molecules comprised of long chains of amino acids joined via peptide (CONH) bonds; these are 20 specific units that are arranged into several macromolecules. Amino acids are absorbed through digestion and are incorporated into the body’s cells to make up organs muscles signal molecules and an alternative energy source.
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For a science fair project, two students decided to repeat the Hershey and Chase experiment, with modifications. They decided to label nitrogen of the DNA, rather than the phosphate. They reasoned that each nucleotide has only one phosphate and two to five nitrogens. Thus, labeling nitrogens would provide a stronger signal than labeling phosphate Why won't this work?A) There is no radioactive isotope of nitrogen.B) Radioactive nitrogen has a half-life of 100,000 years, and the material would be too dangerous for too long.C) Avery, MacCloud and McCarty already did this.D) Although their are more nitrogens in a nucletotide, labeled phosphates actually have 16 extra neutrons; t Shift Ctrl herefore, they are more radioactive.E) Amino acids (and thus and proteins proteins
Final answer:
Labeling nitrogen instead of phosphate in DNA would not work because radioactive nitrogen is not practically detectable like phosphorus-32 used in the Hershey and Chase experiment, and nitrogen does not exclusively mark DNA over proteins.
Explanation:
The idea for the student's science fair project is based on modifying the Hershey and Chase experiment, by labeling the nitrogen atoms in DNA instead of phosphate to provide a stronger signal. However, labeling nitrogen would not provide the desired outcome for several reasons. First and foremost, there is a radioactive isotope of nitrogen (¹⁵N), as demonstrated by Meselson and Stahl's experiment, but it is not used because its radiation is not detectable by the same means used for phosphorus-32. In the Hershey and Chase experiment, radioactive phosphorus (³²P) was used to label DNA because phosphorus is a component of DNA but not protein, and its radioactivity can be easily detected. Secondly, using ¹⁵N would not differentiate between DNA and protein because amino acids also contain nitrogen atoms.
What general statement can be made about the areas a radius vector for these satellites covered in each one hour period?
The speed of satellite is constant and it is able to cover equal distance in each 1-hour period.
Explanation:
Satellite is artificial or natural body which revolves around any planet. Our earth has a natural satellite known as moon. There are a lot of artificial satellites which revolve around the earth continuously. The time period of all the satellites are fixed. They are designated and designed to have uniform circular motion around the earth.
This satellite is very useful for the earth as it transmits signals from one corner of the earth to the other corner. some of the satellite are known as geostationary satellite which revolves around the earth with the same speed as of the earth.
Azotobacter is a genus of bacteria that live in soil and have the following characteristics: a. They are bacilli. b. They are gram-negative. c. They are obligate aerobes. d. They can fix nitrogen. (Unlike some other nitrogen-fixing bacteria, which associate with the roots of plants, Azotobacter species are free-living.)
Answer:
The correct answer will be- all options are correct.
Explanation:
Azotobacter is a genus or a group of bacteria which are involved in the process of nitrogen fixation.
The bacteria can be easily identified by their rod-shaped form and gram staining. Gram staining results show that they are gram-negative bacteria as they stain pink in color due to the thin peptidoglycan layer.
They require oxygen to perform cellular respiration so are called obligate aerobes. Also, they can fix the atmospheric nitrogen by converting it into ammonia.
Thus, all the options are correct.
The nasal cavity is divided into left and right portions by the
Answer:
The correct answer will be- nasal septum
Explanation:
The nasal cavity is the hollow space or cavity connected to the two nostrils which allow the inhalation and exhalation of the air into the nose.
The nasal cavity is divided into left and right portion by a cartilaginous bony structure called nasal septum. The nasal septum lies in the central position and divides the nasal cavity into symmetrical portions.
Thus, the nasal septum is the correct answer.
The nasal cavity is separated into left and right parts by a structure known as the nasal septum, composed of a plate of the ethmoid bone, the vomer bone, and septal cartilage. Other key elements of the nasal cavity include the conchae and nasopharynx.
Explanation:The nasal cavity is divided into left and right portions by the nasal septum. This is a flat, midline structure that is comprised of the perpendicular plate of the ethmoid bone, the vomer bone, and septal cartilage. It separates the left and right nasal cavities. The nasal cavity features three bony projections, the superior, middle, and inferior nasal conchae which increase the surface area of the nasal cavity and disrupt the flow of air as it enters the nose. Lastly, the internal nose opens into what is known as the nasopharynx, an airway portion of the pharynx flanked by the conchae and oropharynx.
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During evolution of the myosin superfamily different myosins diverged in such a way that each is adapted to the specific task that it carries out. In lecture we discussed three properties of myosin motors that vary among family members that underwent adaptation. What are those properties?
Answer:
Three properties of myosin motors are a step size, duty ratio, and tail interactions.
Explanation:
Myosin is an actin motor protein. The primary function of the myosin is to convert ATP to energy. Duty is the fraction of ATP cycle to actin. Step size means displacement during 1 ATP cycle. Step size of myosin was found out by measuring the velocity of different filament size of myosis. Muscles contraction, chemo taxis, cytokinesis is some function that can be related with among the family.Wheat production W in a given year depends on the average temperature T and the annual rainfall R. Scientists estimate that the average temperature is rising at a rate of 0.15°C/year and rainfall is decreasing at a rate of 0.1 cm/year. They also estimate that, at current production levels, δW/δT = -2 and δW/δR = 8. Estimate the current rate of change of wheat production, dW/dt.
Answer:
-1.1
Explanation:
Data provided in the question:
Average temperature is rising at a rate, [tex]\frac{dT}{dt}[/tex] = 0.15°C/year
Rate of change rainfall, [tex]\frac{dR}{dt}[/tex] = - 0.1 cm/year
[tex]\frac{\delta W}{\delta T}[/tex] = -2
[tex]\frac{\delta W}{\delta R}[/tex] = 8
Now,
we need to calculate [tex]\frac{dW}{dt}[/tex]
since,
The wheat production (W) is dependent on the rainfall (R) and the Temperature (T)
thus, Using the chain rule , we have
[tex]\frac{dW}{dt}[/tex] = [tex]\frac{\delta W}{dT}\times\frac{dT}{dt}[/tex] + [tex]\frac{\delta W}{dR}\times\frac{dR}{dt}[/tex]
on substituting the respective values, we get
[tex]\frac{dW}{dt}[/tex] = -2 × 0.15 + 8 × (-0.1)
or
[tex]\frac{dW}{dt}[/tex] = -0.3 - 0.8
or
[tex]\frac{dW}{dt}[/tex] = -1.1
What were the first hominins? What was the evolutionary fate of the first hominins?
Drag the descriptions to the appropriate hominin lineages.
A) Pre-australopithecinerobust.
B) Australopithecinesgenus Homo.
Answer:
A) Pre-australopithecinerobust.
B) Australopithecinesgenus Homo.
Explanation:
Pre-australopithecinerobust.
The few findings indicate that he walked with his back straight, but the shape of the foot, with the big toe directed inward (as in the hands) instead of being parallel to the others, indicates that he should walk leaning on the outside of his feet and he couldn't travel great distances
Australopithecinesgenus Homo.
The first hominids that are certain that they were completely biped are the members of the Australopithecus genus, this type of hominin thrived in the wooded savannas of East Africa between 4 and 2.5 million years ago with remarkable ecological success, as evidenced by the radiation he experienced, with at least five different species scattered from Ethiopia and Chad to South Africa.
What is a second messenger?
A. A substance that reacts with a first messenger.
B. A small substance generated in response to receptor binding that activate or inactivate specific proteins.
C. A substance that reacts with a hormone or other ligand
D. A substance released into the intracellular space.
Answer:
The correct answer is B. A small substance generated in response to receptor binding that activate or inactivate specific proteins.
Explanation:
An example of second messengers are AMPcyclic, Ca2 + ion. In the case of cAMP, the enzyme adenylate cyclase is synthesized from ATP (this is found within the cell membrane). The AMPC is involved in cell signal transduction pathways before external and / or internal stimuli, (example: adrenaline hormone), being able to activate the enzyme called protein kinase A (PKA), which phosphorylates its target and thus the signal is transmitted.
Gail Lewis is a 48-year-old woman who has worked as a legal secretary for a high-powered defense attorney for the last 12 years. She has never been married, and she lives alone. She has been experiencing a burning sensation in her stomach for the last few months, which is now worsening. Gail finally makes an appointment with her healthcare provider (HCP) to find out what is causing the stomach pain.
Which information is most significant when assessing a client suspected of having a peptic ulcer?
Answer: The person`s use of Aspirin
Explanation:
Gail has been experiencing a burning sensation in her stomach for the last few months.This symptom is most significant information to ask her if she has frequently been using Aspirin or products containing aspirin. Gail´s hearburn can be caused by Aspirin which is known to stress the lining of the stomach.
The most significant information for diagnosing a peptic ulcer is the abdominal pain description, the potential presence of Helicobacter pylori, and the patient's NSAID use. Endoscopic examination and H. pylori testing are essential for a definitive diagnosis.
Explanation:The most significant information when assessing a client suspected of having a peptic ulcer is the detailed description of the abdominal pain, its pattern, relation to meals, and any accompanying symptoms such as belching, vomiting, weight loss, and poor appetite. In Gail Lewis's case, a burning sensation worsening over a few months is a key symptom. It is also crucial to consider the possible presence of Helicobacter pylori, a bacterium strongly associated with the development of peptic ulcers. Additional factors to consider include the patient's use of nonsteroidal anti-inflammatory drugs (NSAIDs), as these can contribute to ulcer formation.
Confirmation of a peptic ulcer typically requires an endoscopic examination, which allows direct visualization of the ulcer, and confirmation of H. pylori infection which may necessitate an antibiotic treatment, along with acid-reducing medication.
Explain how aggregation is likely to result in a greater likelihood of survival for schooling fish in the presence of a predator.
Answer:
Aggregation is a mechanism developed by a group of fish called shoal that stay together for social functions. Schooling in shoal is an aggregation technique whereby shoaling fish swim together in a coordinated manner in the same direction. Defense against predators is one of the benefits derived from aggregation which increases the chance of survival of schooling fish. This helps in detecting predators and in reducing the chance of individual capture.
For example, schooling fish that are of the same size and silvery in appearance, through aggregation, would make it difficult for a predator that is visually oriented to pick an individual out of the group as a result of “confusion effect” created by the schooling fish.
Aggregation in schooling fish also helps the group to easily scan for predators around as there are bound to be “many eyes” on the look out for predators. This helps in reducing the chance of predatory attack on the group and increasing the chance of survival of schooling fish.
The larger the number of the schooling fish in aggregation, the higher the chance of survival against predators.
Aggregation or schooling in fish is a survival strategy where forming a group confuses predators and dilutes the risk of predation for individual fish. In addition, a larger school offers greater genetic variation which is essential for the survival of future generations.
Explanation:Aggregation or schooling behavior in fish is a classic example of defensive behavior in biology where individuals come together to form a group, making it difficult for predators to single out and target any one individual. When a predator approaches a school of fish, the school acts as a single entity and performs evasive maneuvers. The predator, confronted with the appearance of a larger creature or a confusing mass of individuals, often hesitates while trying to select a target, giving the fish an opportunity to escape.
The increase in a school's size, or aggregation, provides better protection by diluting the risk of predation. This phenomenon, known as the 'confusion effect', has provided survival benefits to prey species and has been a driving force behind its evolution. To put it another way, it's harder to catch one individual in a large moving group than it is to catch a lone individual.
Aggregation also has the effect of genetic variation in the school of fish. The larger and more diverse the school, the richer the genetic pool, which is fundamental to the survival of future fish generations. This factors in the ability to adapt to environmental changes, including the presence of predators.
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Which term describes a blood transfusion reaction in which an antigen-antibody reaction in the recipient is caused by an incompatibility between red blood cell antigens and antibodies?
Answer:
The correct answer will be- Hemolytic transfusion reaction
Explanation:
Transfusion reactions are called the adverse events which are caused by the transfusion of either one component of the blood or the whole blood.
The transfusion reactions which occur due to the incompatibility reactions of the recipient and the transfused product are called immune-mediated transfusion reaction.
When the incompatibility between the donor red blood cells and the recipient antibodies is observed in the organism, the condition is known as Hemolytic transfusion reaction as it destroys the red blood cells of the donor. This can produce adverse effects on the patient.
Thus, Hemolytic transfusion reaction is the correct answer.
The concentration of ions in the chemical environment surrounding the neurons must be tightly regulated for neurons to function properly. Which of the following cells is most responsible for this?A) satellite cellsB) astrocytesC) Schwann cellsD) oligodendrocytes
Answer:
B) astrocytes
Explanation:
Cells other than neurons that play an important role in the normal functioning of nervous system are called Neuroglia or glial cells.
Satellite cells, astrocytes, schwann cells and oligodendrocytes are all examples of glial cells.
⇒Satellite cells provide protection and nutrition to cells in peripheral nervous system ( peripheral nerves and ganglia).
⇒Astrocytes play an important role in central nervous system (brain and spinal cord). They provide protection to neurons, scavenge ions, form the blood-brain barrier and also maintain extracellular environment suitable for neuronal functioning.
⇒Schwann cells are found in the peripheral nervous system and myelinate the axons of neurons.
⇒Oligodendrocytes are found in central nervous system and produce myelin sheath which myelinates (insulates) axons of neurons. Their function is similar to schwann cells but in the central nervous system.
From the above discussion it is clear that the answer is B) Astrocytes as these maintain a suitable chemical environment for the neurons.
Your objective is to design an observational study to help answer the question_______.What was the determining factor for areas that escaped the worst impacts of the fire, compared to areas that were severely burned?
Muscle cells and nerve cells in one species of animal owe their differences in structure to
Answer: Different genes being expressed.
Explanation:
The differences in the structure of the muscle and the nerve cells is due to the gene expression or gene expressed in the cell and the gene silenced to achieve the desired organisation of cells.
When pink sweet peas were self-pollinated and the sceds were collected and sown, the following flower colors were obtained
Red 34
Pink 76
White 40
Use a chi-squared test to determine whether these results are consistent with the hypothesis that pink flowers are heterozygous for a single pair we predict for our null hypothesis?
A. 9:3:4
B. 3:1:0
C. 1:2:1
D. 1:4:1
The proportions 1:2:1 are consistent with thenull hypothesis that the pink flowers are heterozygous for a single pair.
Option C
Explanation:
Chi square test is used to
(i) Find significant difference in two or more than two proportions
(ii) The goodness of fit between the observed and expected frequency. [tex]X^{2}=\frac{\sum(O-E)^{2}}{E}[/tex]
[tex]X^{2}=\left[\frac{(34-37.5)^{2}}{37.5}\right]+\left[\frac{(76-75)^{2}}{75}\right]+\left[\frac{(40-37.5)^{2}}{37.5}\right][/tex]
= 0.3266 + 0.0133 + 0.1666 = 0.506
5% Critical value = 5.991
Degree of freedom = 2
To see patterns in the data from an experiment like this, it is helpful to graph the data. A bar graph is used instead of a line graph because each type of liver cell was independent of the others. But first, you must determine which variable should go on each axis of the graph.
What variable did the researchers intentionally vary in the experiment, and what are the units for this variable?
Answer:
From the information you provided, the information intentionally varied is the type of liver cells and there should not be any units for this variable unless the liver cells were categorised by a quantitative feature. The y axis would be the axis of the dependent variable measured and the x axis would be the axis of the independent variable measured.
Explanation:
One character in peas that Mendel studied was yellow versus green seeds. A cross between a homozygous yellow line (YY) and a homozygous green line (yy) will result in F1 plants that are heterozygous (Yy) for this trait and produce yellow seeds.
Answer:
The statement is true.
Explanation:
Gregor Mendel, the Father of Genetics, used pea plants as a model to study inheritance for several reasons, but mainly because they possess a diversity of phenotypic traits, such as different colors and shapes.
Mendel analyzed the inheritance patterns of parental genes in regard to how these genetic traits appeared in the phenotype of the offspring, he categorized these traits as dominant (two capital letters; AA) or recessive (two low-case letters; aa). To test this in the experiments, he selected yellow and green pea plants.
When he crossed yellow and green pea plants, he observed that the first generation exhibited the yellow phenotype. This indicated that the color yellow (YY) was the dominant one, while the green (yy) was, consequently, recessive.
Therefore, if we cross a homozygous yellow line (YY) with a homozygous green line (yy), the result of the First Generation (F1) will result in heterozygous plants with a yellow phenotype as demonstrated in the Punnett Square below:
Y Y
y Yy Yy
y Yy Yy
YY: Yellow
yy: Green
Yy: Yellow
Biologists have found more than 500 species of fruit flies on the various Hawaiian islands, all apparently descended from a single ancestor species. When this ancestor colonized the island chain, it found few competitors: Many insect and fly families present in other regions are absent from the isolated Hawaiian Islands. This example illustrates _____.
Answer:
Adaptive radiation
Explanation:
Adaptive radiation occurs when an ancestral species move to a new environment that has various resources that are necessary for survival and also has environmental conditions that would ensure its offspring adapt well over time. In this new environment, the ancestral species would produce offspring with different traits and behaviors that will allow them to survive in this new environment while occupying their various niches. Over a relatively short time, different species arising from the common ancestor would occupy the new environment.
Gender role socialization... is the process by which social institutions shape expectations of acceptable behaviors for men and women. makes anti-discrimination and equal pay legislation more effective. results in men preparing for non-traditional jobs for men. None of the above.
Answer:
gender role socialization is the process by which social institutions shape expectations of acceptable behaviours for men and women
Gender role socialization is the process by which societal expectations of acceptable behaviors for men and women are shaped, involving agents like family and media. It enforces stereotypes and limits personal freedom, but understanding it can lead to more inclusive societies.
Gender role socialization is the process by which social institutions shape expectations of acceptable behaviors for men and women. This includes how individuals are taught to behave, perceive, and interact within their societal roles based on their gender. The primary agents of gender socialization are family, education, peer groups, and mass media, each reinforcing gender roles and creating normative expectations for gender-specific behavior. This process begins early in life, leading individuals to often subconsciously conform to these roles, believing their actions to be natural rather than the result of societal constructs.
Gender socialization plays a critical role in shaping the lives of individuals by dictating the behaviors, attitudes, and opportunities deemed appropriate based on one's gender. Unfortunately, this often enforces stereotypes and limits personal freedom and expression, contributing to a cycle of gender-based discrimination and inequality. Understanding and challenging these constructed roles can lead to more inclusive and diverse societies, where individuals are valued for their unique abilities rather than their adherence to prescribed gender roles.
What are the reasons for the several day delay in a primary response. Infection______. A. transport to secondary lymphoid tissue B. antigen processing and presentation C. small initial # of lymphocytes specific for the antigen D. proliferation and differentiation.
Answer:
The correct answer is D. proliferation and differentiation.
Explanation:
Primary immune response occurs due to the first exposure of an antigen to the immune system. The primary immune response is generally delayed by many days because it takes time for B and T cells to become cloned and to proliferate and differentiate.
Then after several days of proliferation and differentiation of activated T and B cells, T cells become effector T cells and B cell becomes plasma cells which then eliminates the antigen. Memory B and T cells are also produced during this process which helps in generating a quick immune response during the second and subsequent exposure of that antigen.
So the correct answer is D. proliferation and differentiation.
Compare the two theories regarding the evolution of dinosaurs and then consider the cladogram above. Although the two theories differ on the evolutionary path of dinosaurs, they agree that
Answer:
they agree that dinosaurs, reptiles, and birds had belong to common ancestor.
Explanation:
The reptilians initially emerged before the dinosaurs, but after they never appeared less, the dinosaurs managed to take up the top niches in the food chain. On the other hand, the birds are in fact an evolutionary product of dinosaur diversification. The birds evolved from small bipedal dinosaurs that began to take on a new way of life and appearance in the course of time.
The dinosaurs have not evolved as a separate phylum that does not have close relationships with other animals, but rather shares a common ancestor with reptiles and bird likes.
What type of arthropod appendage is comprised of a single series of segments attached end-to-end
Answer:
The correct answer is - uniramous.
Explanation:
The appendages are present on each body segment of all arthropods. Each segment generally has a pair of end to end appendages. The appendages of the arthropods may be either uniramous or biramous depending on their number of branches in segments.
Uniramous appendages are the appendages that comprise the single series of the end to end attached together, whereas biramous appendages have two branches and each branch has a series of the end to end segments.
Thus, the correct answer is - Uniramous appendages.
An elephant and a mouse are running in full sunlight, and both overheat by the same amount above their normal body temperatures. When they move into the shade and rest, which animal will cool down faster?
A. The elephant will because it has the higher surface-area-to-volume ratio.
B. The elephant will because it has the lower surface-area-to-volume ratio.
C. The mouse will because it has the higher surface-area-to-volume ratio.
D. They will cool at the same rate because they overheated by the same amount
Answer:
The mouse will because it has the higher surface-area-to-volume ratio.
Explanation:
The living organisms maintain their homeostasis by maintaining their internal constant environment as external environment changes. These organisms are known as exothermic animal.
The surface area to volume ratio in case of living organisms plays an important role. The small species has high surface area to volume ratio as compared to the larger species. The diffusion, cooling and other process is faster in the small size species. The mouse body will get cool faster than elephant species.
Thus, the correct answer is option (3).