Question 25
4 pts
Artificially transported sand is associated with which type of stabilization?
A. groin
B. seawall
C. beach nourishment
D. relocation
Answer:
C. Beach nourishment
Explanation:
Beach nourishment the process by which sand lost through erosion or longshore drift is replace by other sources.
Its also known as beach renourishment or replenishment.
The separation of the sister chromatids occurs in:
la- anaphase I
b- metaphase I
c- anaphase I and anaphase II
d- mitotic anaphase and anaphase II
(jusitfy your answer)
On-center cells: A. are excited by light that falls in the periphery of their receptive field. B. are excited by light that falls in the center of their receptive field. C. are inhibited by light that falls in the center of their receptive field. D. are excited by light that falls across their entire receptive field.
Answer: B) are excited by light that falls in the center of their receptive field.
Explanation:
There are two types of bipolar cells present in the retina which are differentiated on the way the centres of their receptive fields respond to light. The names of bipolar cells are ON-centre and OFF-centre.
If a light fall at the centre of the receptive field of a bipolar cell, it will experience an exciting effect on that cell, resulting in it being depolarized, it is an ON-center cell.
Hence, the correct option is B.
Final answer:
On-center cells are excited by light that falls in the center of their receptive field. These cells are part of the retina's ganglion cells, which are connected to the photoreceptors through the bipolar cells and contribute to visual contrast and sharpness.
Explanation:
A student asked whether on-center cells are excited by light that falls in the periphery of their receptive field, in the center of their receptive field, or across their entire receptive field, or if they are inhibited by light that falls in the center of their receptive field. The answer to this question is: B. are excited by light that falls in the center of their receptive field.
In the visual system, particularly the retina, there are photoreceptors like rods and cones that respond to light. These photoreceptors connect to bipolar cells, which in turn connect to ganglion cells. These ganglion cells have receptive fields with distinctive on-center and off-center characteristics. On-center cells become excited when light stimulus is applied to the center of their receptive field and become inhibited when the light stimulus is applied to the periphery of the receptive field. This process is part of a complex neural circuitry including photoreceptors, horizontal cells, bipolar cells, and amacrine cells, which helps to enhance the visual contrast and sharpness of the image.
What is NOT a way in which bacteria are beneficial to humans ?
Answer: Some bacteria are harmful to human body considering it can get you ill by killing cells in you body.
A cross section of a seed is shown.
Which is represented by the letter X?
embryo
seed coat
stored food
leat
S
IL
Answer:
The correct answer is embryo
Explanation:
A sample of DNA from an unknown organism is analyzed and found to contain histone proteins, more than 2 billion base pairs, and large segments of noncoding DNA. From this information, one can conclude that the organism is:
Answer:
The correct answer is an eukaryote.
Explanation:
The DNA present in eukaryotes comprises chromosomes bundles, these bundles contain molecules of linear DNA, which is wrapped around the protein, that is, alkaline known as histones. These histones help the DNA to turn into a more composite composition.
The DNA present in a eukaryote may comprise more than two billion base pairs, and because of the linear characteristic, the DNA within a eukaryote comprises sequences of non-coding DNA known as telomeres found on each terminal of the chromosomes.
What are the most common symptoms of
musculoskeletal diseases and disorders?
Answer:
Common symptoms of musculoskeletal disorders include pain, weakness, stiffness, joint noises, and decreased range of motion. Inflammation may cause pain, swelling, warmth, tenderness, impaired function, and sometimes redness of the overlying skin.
Includes Diseases: Rheumatoid arthritis
Explanation:
Answer:
Common symptoms of musculoskeletal disorder includes pain, stiffness, weakness, swelling, and motion range decreases.
Explanation:
Musculoskeletal disorder is combination of Muscles and skeleton.
It is a disorder that affect the body movement.
For e.g. tendon strain (disease) is an example.
BRAINLY please help
Which of these cell types is NOT an immune cell?
A.
leukocyte
B.
phagocyte
C.
lymphocyte
D.
erythrocyte
Answer:
D
Explanation:
A is incorrect because leukocyte is a colorless cell that circulates in the blood and body fluids and is involved in counteracting foreign substances and disease; a white (blood) cell.
B is incorrect because phagocytes are a type of cell within the body capable of engulfing and absorbing bacteria and other small cells and particles.
C is incorrect because lymphocyte are a form of small leukocyte (white blood cell) with a single round nucleus, occurring especially in the lymphatic system.
D is correct because erythrocyte are a red blood cell that (in humans) is typically a biconcave disc without a nucleus. Erythrocytes contain the pigment hemoglobin, which imparts the red color to blood, and transport oxygen and carbon dioxide to and from the tissues.
the importance of biodiversity in chimps
inhibition is a mechanism of succession in which Group of answer choices the arrival of one species at a site affects the subsequent colonization of other species. one species decreases the probability that a second species will become established. one species increases the probability that a second species will become established. the probability that a species can become established depends on the presence of another species.
Answer:
option B: one species decreases the probability that a second species will become established
Explanation:
Inhibition as a mechanism of succession occurs when some early species which could also include pioneer species make the site less suitable for the development of other species and do not allow them to become established and grow. When eventually these early species die, other species that were hindered will subsequently grow and become established gradually giving rise to a climax community.
LISA
Biography
Editorial
All of this is nothing, however, against Enrique's
longing for his mother, who left him behind
eleven years ago. Although his efforts to survive
often force her out of his mind, at times he thinks
of her with a loneliness that is overwhelming. He
remembers when she would call Honduras from
the United States, the concern.
-Enrique's Journey,
Sonia Nazario
Use the drop-down menus to choose whether each
statement describes the biography, the editorial, or
both
The passage presents the idea that lives are in
danger
The text uses third-person point of view to express
feelings
The text presents an opinion about the topic of
immigration
Answer:
The passage presents the idea that lives are in danger.
✔ both
The text uses third-person point of view to express feelings.
✔ the biography
The text presents an opinion about the topic of immigration.
✔ the editorial
Explanation:
The first statement describes both an editorial and a biography. The second statement describes the biography. The third statement describes the editorial.
A biography is simply an account of a person’s life. It can be about a living person, a person who lived hundreds of years ago, a person who is world-renowned, a forgotten hero, or a group of people.
An editorial, a leading article, or a leader is an article that is written by the editor-in-chief of a newspaper (or magazine). The article is usually not signed. Editorials are often referred to as “opinions”.
To learn more about the editorial, refer to the link:
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Which feature on microscope did Anton van Leeuwenhoek add that enabled him to magnify organisms about 250 times?
•drop of water
•light from oil lamp
•tubes that extend
•polished lenses
Answer: Polished lenses
Explanation:
I did the quiz
Answer:
polished lenses
I got it right :D
The atrial cells and ventricular cells are connected to each other using gap junction so that the wave of depolarization can directly spread from the atrium to the ventricle without the AV node.a.true b.false.
Answer:
The given statement is true.
Explanation:
The atrial cells and ventricular cells are connected to each other using gap junction so that the wave of depolarization can directly spread from the atrium to the ventricle. This is true.But, not without using the AV nodes. Through myocytes, the depolarizing waves pass much slower than the atrioventricular cells. AV nodal cells conduct them much faster than the atrial and ventricular cells. This system works as a standby. If there is some problem with the AV node, the atrial and ventricular cells will be able to spread the depolarizing waves with the help of gap junctions and without bothering the AV node.Where does blood go after it leaves the right side of the heart
Answer: Blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs.
Explanation:
Consider a hypothetical locus with two segregating alleles (A and B). Population size is small, mutation is absent, and neither of the two alleles has a selective advantage. After a long period of time (many generations), what will occur?a) The population will eventually become monomorphic for one of the two alleles.b) Allele frequencies will cycle over time.c) Balancing selection will maintain both alleles.d) Allele frequencies will change over time, but both alleles will remain.e) Allele frequencies will remain constant.
Answer:
The preferable option will be - A.
A. The population will eventually become monomorphic for one of the two alleles.
Explanation:
The population will eventually become monomorphic for one of the two alleles because -
Here mutation is absent. No other allele is allowed to get involved here. The population size is small. As allele A and B are fixed for that population after many generations the population will become monomorphic for that two alleles.When a substance moves across the plasma membrane along a concentration gradient at a rate faster than would be expected by simple diffusion alone but without the expenditure of metabolic energy, the process is best described as:
A. Facilitated diffusion
B. active transport
C. pinocytosis
D. the work of an ion pump
E. Osmosis
Answer:
A. Facilitated diffusionExplanation:
The plasma membrane is an important membrane that is present in the cell and plays an important role in the exchange of the materials across the cell. This membrane is made up of phospholipid bilayers and some other components. Movement of the substances across the membrane takes place by two methods such as an active process in which the energy required and the other is the passive process in which energy is not required.Diffusion, osmosis, and facilitated diffusion are an example of passive diffusion. Facilitated diffusion is such type of passive movement in which the membrane proteins helps in the transport of the substances across the membrane and thus the is faster than other passive processes. In this process no energy is required and movements take place along the concentration gradient.
Molecules are moved over the membrane using one of two methods: an active process that requires energy, or a passive mechanism that does not.
The process is best described as a form of passive diffusion (Facilitated diffusion) option A.
Facilitated diffusion is a sort of passive movement in which specific transmembrane integral proteins aid in the transport of molecules across the membrane.This result in a faster process than other passive processes.There is no need for energy in this particular transport process and movements are made along the concentration gradient.
Learn more about facilitated diffusion: https://brainly.com/question/910990
If you had a sample organism and wanted to measure its rate of cellular respiration, which of the following methods would provide useful information? Study the equation for cellular respiration to have a clear sense of what is consumed and what is produced before answering the question?
Explanation:
Aerobic cellular respiration is the process by which the cells of a living being separate nourishment and transform it into the energy they have to play out their essential functionsThe most importance of aerobic respiration in living things can't be belittled Without this process, no living thing would survive Oxygen is a critical component of Aerobic respiration in many animalsThe motivation behind the oxygen is so significant is on the grounds that it assumes a critical job in the mitochondria, the powerhouses of the cellThe mitochondria has two layers. On the inward layer, 4 gatherings of protein structure the Electron Transport ChainBiological transmission differs from mechanical transmission in that biological transmission
Answer:
Biological transmission involves the reproduction or propagation of agent or pathogens within the arthropods vectors before transmission begins.while mechanical transmission involves just transfer of pathogens/agents from an infected host,to another suspectable host directly(direct mechanical transmission) or when anthropoids transmits pathogens obtained from from a contaminated source.(indirect mechanical transmission).
The two mechanisms represented mode of transmission of diseases.
The presence of a mutualist spider in a certain area improves the survival of an herbaceous shrub by reducing the impact of herbivorous insects. These spiders are preyed on by lizards, and lizards are eaten by birds. An increase in the density of lizards would most likely have a _______ direct effect on spiders and a _______ effect on the plant.
Answer:
An increase in the density of lizards would most likely have a negative direct effect on spiders and a negative indirect effect on the plant.
Explanation:
Many animals modify their environments, apparently to reduce predation risk .Scincid lizards are included or excluded from 21 replicated plots, and spiders therein are classified as exposed or sheltered, depending on whether they are uncovered in their web or hidden in cocoons, leaves/debris, or burrows. Exposed spiders are greatly affected by the presence of predatory scincid lizards, whereas sheltered spiders are not. More specifically, lizards, which forage close to the ground, reduce the abundance of exposed spiders by two-thirds but have no effect on the abundance of sheltered spiders. Sheltered spiders are able to avoid predation and share space with lizards, suggesting that shelter construction is a mechanism for reducing predation risk and has important population consequences.
A species of a large brown bear lived in Siberia about a million years ago. Over time, the northern population became white-colored and acquired heavier fur as it blended into the snowy landscape. The southern population acquired lighter, darker-colored fur as it adapted to forest ecosystems. Eventually, they could no longer reproduce with each other. Which of these terms describes this transition?
a. transmofrification
b. coincidence
c. providence
d. lost in translation
e. speciation
Answer:
e. speciation
Explanation:
The definition of speciation is: the evolutionary process by which populations evolve to become distinct species.
In this scenario, the bears that were once of the same species evolved in order to adapt to their environment. Once they evolved, they could no longer produce with each other, as they are now different species.
Describe the role of Cyanobacteria in charging Earth's early atmosphere
Cyanobacteria, through photosynthesis, played a crucial role in transforming Earth's early anoxic atmosphere by producing oxygen. This led to the Great Oxygenation Event, which allowed for the evolution of aerobic organisms and ultimately paved the way for the diversity of life that we see today.
Explanation:Role of Cyanobacteria in Earth's Early AtmosphereThe role of cyanobacteria, often referred to as blue-green algae, was instrumental in transforming Earth's anoxic early atmosphere. These organisms are known for their ability to perform photosynthesis, a process that results in the production of oxygen. Initially, Earth's atmosphere had no molecular oxygen, and anaerobic organisms were the only forms of life able to survive. Cyanobacteria evolved from early phototrophs, and their emergence around 2.5 billion years ago sparked a significant change known as the Great Oxygenation Event.
Through their photosynthetic activities, cyanobacteria began releasing substantial amounts of oxygen into the atmosphere. This not only changed the atmospheric composition but also led to the first-known mass extinction, as many anaerobic organisms could not withstand the presence of oxygen. However, this event also paved the way for the evolution of aerobic life forms, including multicellular organisms, and the development of more efficient oxygen-utilizing catabolic pathways. The oxygenation also contributed to the formation of the ozone layer, which protects living organisms from harmful ultraviolet radiation.
Furthermore, the rise of cyanobacteria and the subsequent oxygenation of the atmosphere is thought to have been a driving force behind the evolution and increased colonization of land by more complex life forms. Hence, cyanobacteria played a crucial role in shaping Earth's atmosphere and the direction of evolutionary history on the planet.
Any change in the normal nucleotide sequence that codes for an amino acid is called a
Answer:
mutation
Explanation:
I'm not sure, but it can be.
Any change in the normal nucleotide sequence that codes for an amino acid is called a - mutation.
Amino acids are composed of two functional groups the amnio group, and the carboxyl group. They join together to make a polypeptide chain resulting in the formation of a protein.
In a living cell, DNA is composed of four bases adenine (A), thymine(T), guanine (G), and cytosine (C), while in RNA, the T is replaced by uracil (U).DNA is transcribed to mRNA, and three bases in mRNA together form a codon.One amino acid is formed from one codon - for instance bases A, U, G form a codon AUG and encode methionine (amino acid).Therefore, if any change occurs in the normal base sequence of the DNA is considered as mutation (Point mutation)The mutation will be carried to its mRNA, leading to defective amnio acids.Sickle cell hemoglobin is one such exampleThus, any change in the normal nucleotide sequence that codes for an amino acid is called a - mutation.
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What term means change over time?
Answer:
Evolution
Explanation:
evolution is what happens over a long periods of time
Which characteristic is found in liquids and gases?
particles stay in a fixed position
takes the shape of the container
has a fixed volume
no particle movement
Answer:
Takes the shape of the container
In which direction is air pressure exerted
Answer:
depends
Explanation:
Answer:
Air pressure is exerted in all directions.
A mammalian skull is found in a forest. The skull has incisors, small canines, and many large premolars and molars with prominent surface ridges. Based on this information, what conclusions can be drawn about the feeding behavior of this organism?
Answer:
The animal was most likely an omnivore.
Explanation:
From the dentition, the animal is most likely an omnivore. Carnivores have large and sharp canines for tearing of flesh while most herbivores lack canines altogether.
Answer:
The feeding behavior of this organism is omnivorous.
Explanation:
Omnivorous are those organisms which feed on both plants and animals for the uptake of energy. There are various types of teeth are present in the jaw of omnivorous organisms such as incisors, canines, premolars and molars. Every teeth have a specific function i . e. incisors helps in cutting of food, the canines helps in tearing and the molars and premolars is responsible for crushing the food materials.
Enkephalins and endorphins are peptides that act like morphine. True or False
Answer:
True.
Explanation:
Enkephalins and endorphins are endogenous peptides while morphine is an exogenous peptide.
Enkephalins and endorphins are powerful analgesics 18 to 500 times more than morphine. Hence, morphine is less analgesic than enkephalins and endorphins.
Enkephalins and endorphins act on the mu, kappa , delta receptors and morphine also acts on the same receptors. All of them has same effects on the body.
Hence, Enkephalins and endorphins are peptides that act like morphine.
Answer:
True
Explanation:
Endorphins are hormones of the body that are internally derived. They are opioid neuropeptides produces in humans and some other animals and are able to bind to opiate receptors. These endogenous peptides are similar to opiod drugs e.g morphines, they help to relieve pain and stress. It can also be referred to as the happy hormone.
Also, enkephalins are endogenous hormones produced in the body. They are opioid pentapeptides and are similar to morphines as they are able to bind opiate receptors. They also help in relieving stress.
A man with the autosomal recessive disorder phenylketonuria (PKU) and a woman without PKu heve a son named Peter, who does not have PKU. Peter is curious about whether hs mother is a carrier for PKiu Which fact would allow him to know Peter's matemal grandmother does not have PkU.
1. Peter's maternal grandfather does not have PkU
2. Peters maternal grandfather has PKu
3. Peter submits his own blood semple to a local genotyping lab, which establishes that he is a carrier for Pku
4. Peter's own daughter has PKU
Answer:
2. Peter's maternal grandfather has PKU.Explanation:
Such type of the genetic disorder in which two copies of a gene must be mutated at a time is called autosomal recessive disorder such as sickle cell anemia, phenylketonuria, and some other diseases. When a sing copy of a gene is mutated in a person then this disorder is not appeared and the person is called a carrier. So when a child is born by two carrier parents then there is a chance that a child will be affected if both the parents donate mutated genes. In the case of Peter, since peter does not show this defect this means his maternal grandfather was affected by this disorder.Which systems work together so oxygen can be distributed to the cells of your body? How do these two systems work together to accomplish this task?
Answer: The human respiratory and circulatory systems
Explanation: The human respiratory and circulatory systems work together to supply the body with oxygen and get rid of waste carbon dioxide. While the former deals with air and the latter with blood, they work together seamlessly by coordinating the functions of the many parts of each system.
( Edit ) Please mark as brainliest :)
Answer:
The respiratory and circulatory systems work together to bring oxygen to the cells in the body. The respiratory system takes oxygen from the air to the lungs, where the oxygen is transferred to the blood. The circulatory system transports the blood, which delivers oxygen to the cells in the body.
Explanation:
Sample Answer
How does the loss of bicarbonate due to diarrhea increase the protons in the blood?
Answer:
Increase of protons (H+) in the blood causes acidosis. These effects decrease hemoglobin’s affinity for oxygen and weakens its capacity to bind and increasing the haemoglobin dissociation.
Loss of bicarbonate stores by diarrhoea or tubular renal waste results in a state of metabolic acidosis leads increased concentration of plasma chloride and decreased concentration of plasma bicarbonate. Decrease in plasma bicarbonate leads to increase in H+ ions causing acidosis.