Answer:
Missed and algae are the earliest plants that Dorminate Earth history.
The groups of animals are sponges, jawless fishes, evolution of amphibians, reptiles and early mammals.
Explanation:
Most animals and plants are classified as muiticellular Eukaryotics. They have many cells and nucleus in their organelles wy some animals or plants are classified as prokaryotics base on relative evolution history.
Both animals and plants owe their origin to endosymbiosis, a process whereby one cell ingests another but fail to digest it. Just like plants, animals evolved from the sea from history and that is why the remained for at least 600 million years.
All of the following help the cell regulate gene expression during Step 2 of protein formation EXCEPT
A. general factors that are required for the RNA polymerase to bind to the promoter
B. repressors binding to the operator preventing the RNA polymerase from progressing
C. specialty factors binding to the RNA polymerase, altering its specificity
D. tRNA that binds to the RNA polymerase in the presence of complementary mRNA
The cell regulates gene expression during Step 2 of protein formation, except for tRNA binding to the RNA polymerase in the presence of complementary mRNA.
Explanation:
The subject of this question is Biology and the grade level is High School.
All of the options listed in the question are examples of mechanisms that cells use to regulate gene expression during Step 2 of protein formation. However, option D, tRNA binding to the RNA polymerase in the presence of complementary mRNA, is not a correct example. tRNA is involved in protein synthesis, not gene expression regulation.
So, the correct answer is D. tRNA that binds to the RNA polymerase in the presence of complementary mRNA.
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The muscular and skeletal systems interact with one another to maintain
Answer:
Homeostasis
Explanation:
Skeletal muscles contribute to maintaining temperature homeostasis in the body by generating heat. Muscle contraction requires energy and produces heat as a byproduct of metabolism. ... In these individuals, a drastic increase in skeletal muscle calcium leads to sustained contractions and heat generation.
whats your biggest organ on the body
Answer:
The liver
Explanation:
Answer:
Your skin
Explanation:
The skin is body's largest and also the fastest-growing organ. Skin covers 22 square feet of the human body in a full grown adult.
Flexibility is _________.
a. best described as the ability to move without pain during strenuous exercise.
b. the ability of joints to move through their full range of motion.
c. sustained motion without resistance.
d. the ability to move rapidly during exercise.
Answer:
b
Explanation:
to become more flexible, you have to stretch your muscles. This allows your joints to move more freely by loosening what is keeping them tight.
Flexibility in physical fitness refers to the ability of joints to move through their full range of motion. It doesn't have to do with the speed or endurance during exercise, rather it concerns the joints' and muscle's allowance of movement into various positions without discomfort.
Explanation:In physical fitness, flexibility is most accurately defined as the ability of joints to move through their full range of motion. This means that when we say someone is flexible, they are capable of bending, twisting, and stretching their bodies into different positions without discomfort. Moreover, being flexible isn't necessarily connected to the ability to move rapidly during exercise—this is more related to agility. Also, while staying in motion without resistance pertains to endurance, flexibility specifically centers on the joints. Instead, a flexible person can perform activities such as touching their toes or doing a split because their joints and muscles allow for these movements.
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How many chromosomes are in the body cells of an organism that has a diploid number of 8
A. 4
B. 8
C. 16
Answer:
there are 16 chromosomes
Body cells of an organism with a diploid number of 8 will have 8 chromosomes. Diploid cells have twice the number of chromosomes as haploid cells, and meiosis produces four haploid offspring from a diploid cell. A gamete of an organism, which is haploid, would have half the number of chromosomes that a somatic cell has.
Explanation:The diploid number of an organism refers to the total number of chromosomes found in a normal somatic cell. This number is often represented as 2n, where 'n' stands for a single set of chromosomes. Therefore, in an organism with a diploid number of 8, it will have 8 chromosomes in its body cells.
Diploid cells have twice the number of chromosomes as their haploid counterparts.Meiosis typically produces four haploid daughter cells from a diploid cell.When a muscle cell of an organism has 32 chromosomes, being a diploid somatic cell, a gamete from the same organism (which is haploid) would have half the number of chromosomes, meaning 16 chromosomes.
A typical human cell contains 46 chromosomes. After mitosis and cell division, each of the two new cells formed for the original cell:
A. gets 23 new chromosomes
B. a grows new chromosomes from
existing DNA
C. gets a complete set of 46 chromosomes
Answer:
gets 23 new chromosomes
how did receptors in the nose and on the tongue help our ancient ancestors survive?
Answer:Our ancestors’ perception of taste was important for survival and thriving. Now researchers are trying to produce food with reduced calories or salt that remains palatable
Explanation:
Evolution of taste
Our ancestors had to seek out their food from the environment, and their perception of taste was important for survival and thriving. ... They work with foods that are being produced in a manner that reduces calories or salt or adds ingredients with potential health benefits from plants
Answer:
Helped them find food that would provide energy and nutrients.
Explanation:
Our ancestors had to find their food from the environment, and their perception of taste was important for survival and thriving. The sense of smell plays a decisive role in human societies, as it is linked to our taste for food, as well as our identification of pleasant and unpleasant substances.We have around 4 million smell cells in our noses, divided into about 400 different types. There is a large genetic variability within and between populations for our ability to detect odours. Each smell cell carries just one type of receptor for us to understand.
While many factors affected there choice of food and how we perceive its taste. When food meets our taste senses, raised bumps on our tongue called the papillae react. the ability to assess the calorie intake and the nutrient value of the food, helped them detect dangerous or poisonous foods (which would tend to be bitter or sour). It also helped distinguish foods that appeared in new environments.
Do turtles fly?...................................
Answer:
They fly in the water
Explanation:
In the sierra nevada mountains of california there are many populations of the checkerspot butterfly, euphydryas editha. you notice that females of one population (population
a.lay their eggs near the tip of a plant's stem. females of another population in the same area (population
b.lay their eggs at the base of the stem on a different type of plant. the young hatch out as caterpillars; they live on the host plant and eat its leaves.
Answer: partitioning of the butterfly due to available resources leading to a reduction in population in a particular location.
Explanation:
What happen here is a reduction in population due to a reduced sharing of resources.
Two species of an Organism can not successfully occupy a space due to competition for available resources.
Here, the one population of checker spot is near the stem tip while the other population of checker spot butterfly is at the base of the stem to avoid competition for available resources and space. Hence, they live separately in the different position on the stem.
Which process produces two genetically identical somatic cells?
Answer:
Mitosis
Explanation:
In single-cell organisms, mitosis is the only form of cellular reproduction. One round of mitosis yields two genetically identical cells. In multi-cellular organisms, like ourselves, mitosis only occurs in somatic cells, which comprise all cells in an organism excluding germ cells
The outer most layer of the interior
Constant high pressure in an area in summer will MOST LIKELY cause a
Constant high pressure in an area in summer will most likely cause stable and dry weather conditions.
Constant high pressure in an area during summer typically leads to stable and dry weather, with clear skies and higher temperatures due to sinking air that inhibits cloud formation. High-pressure systems are generally associated with sinking air, which inhibits cloud formation and leads to clear skies. Moreover, the sinking air increases in temperature as it descends, which can cause higher temperatures in the affected region. Since there are fewer clouds, there will be more sunlight reaching the ground, contributing to the warming effect. Furthermore, high pressure tends to divert storm systems, keeping the region dry. These weather conditions can persist for an extended period if the high-pressure system remains stationary.
What part of the food web do these images represent? EXPLAIN YOUR ANSWER!!
Answer:
Producer.
Explanation:
They're plants. Plants are producers, and they get eaten by consumers.
Answer:
Decomposers
Explanation:
These are producers, however, they're slowly rotting and decomposing themselves because they aren't good to eat anymore.
Police discover a badly decomposed body buried in an area where a man disappeared some years before. the case was never solved, nor was the victim´s body ever recovered. as the lead investigator, you suspect that the newly discovered body is that of the victim. what is your main challenge in using dna typing to determine whether your suspicion is correct? how would you go about using dna technology to test your theory? explain, please.
Final answer:
The main challenge in using DNA typing to determine whether the newly discovered body is that of the victim is the state of decomposition. To test the theory, the lead investigator can collect DNA samples from the remains and send them to a forensic laboratory for analysis.
Explanation:
The main challenge in using DNA typing to determine whether the newly discovered body is that of the victim is the state of decomposition. If the body is badly decomposed, it can affect the quality of the DNA and make it more difficult to obtain a usable sample. Additionally, if the body has been buried for several years, the DNA may have degraded to a point where it is no longer viable for analysis.
To test the theory, the lead investigator can begin by collecting DNA samples from the remains. This can be done through bone or teeth samples, as well as any soft tissue that may still be present. Once the samples are collected, they can be sent to a forensic laboratory for DNA analysis.
The DNA analysis process involves extracting the DNA from the samples, amplifying specific regions of the DNA using polymerase chain reaction (PCR), and comparing the amplified DNA to known reference samples. If the DNA from the remains matches the DNA from the reference samples, it would provide strong evidence that the newly discovered body is that of the victim.
To test the theory, forensic experts would extract DNA from the remains and attempt to amplify it using Polymerase Chain Reaction (PCR).
The main challenge in using DNA typing to confirm the suspicion lies in the state of decomposition of the body. Decomposition can degrade DNA, making it difficult to obtain viable samples for analysis.
However, if any DNA remains intact, comparison with reference samples, such as those from the victim's family or personal effects, can provide crucial evidence.
Next, they would compare the obtained DNA profile with reference samples, looking for matches in specific regions of the genome. If a match is found, it would strongly support the hypothesis that the newly discovered body is indeed that of the missing person.
Additionally, advanced techniques like mitochondrial DNA analysis could be employed to overcome challenges posed by degraded DNA.
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Many nonscience careers require a knowledge of science because workers must
O
A. develop new scientific laws and theories.
O
O
B. use materials and processes that follow scientific principles.
O
O
C. use the process of scientific inquiry.
O
D. keep up with new developments in science.
Answer:
D
Explanation:
Advancements in the science field often have an impact on other careers
The major role of absorption in the ileum is to reclaim bile salts to be recycled back to the liver. True or False
Answer:
The correct answer is "True".
Explanation:
It is true that the major role of absorption in the ileum is to reclaim bile salts to be recycled back to the liver. The ileum is the final part of the small intestine, serving as the terminator of the ileocecal sphincter. The ileum is the final step of absorption in the small intestine and while most nutrients are absorbed in the jejunum, the ileum absorbs the bile salts and some vitamins, like vitamin B12.
What is the best definition of an allele?
Answer:
An allele is one of a pair of genes that appear in a particular location on a particular chromosome and control the same characteristic, such as blood type or color blindness.
Explanation:
Answer:
One of alternative forms of the same gene
Lupus, a condition in which the body attacks its own cells, is an example of
Answer:
Lupus is an example of an autoimmune disease.
Explanation:
in a population of 900 pea plants, 530 are homozygous purple, 250 are heterozygous purple, and 120 are homozygous white. Purple (P) is dominant and white color (p) is recessive. determine the genotypic frequency in the population for PP, Pp, and pp individuals.
The genotypic frequencies for PP, Pp, and pp in the specified pea plant population are 58.8%, 27.7%, and 13.3% respectively. These frequencies can be used to study the genetic structure of the population and predict the distribution of phenotypes in future generations.
Explanation:The genotypic frequency in a population is determined by the number of individuals with a specific genotype in comparison to the total number of individuals. In this case, we are looking at the frequencies of
PP
,
Pp
, and
pp
pea plants. Genotypic frequency is calculated as the number of individuals with a specific genotype divided by the total number of individuals.
For the homozygous dominant (PP) : 530/900 = 0.588 or 58.8% are homozygous dominant.
For the heterozygous (Pp): 250/900 = 0.277 or 27.7% are heterozygous.
For the homozygous recessive (pp): 120/900 = 0.133 or 13.3% are homozygous recessive.
By summing up these frequencies, we should get 1 (or 100%), confirming that we have accounted for all the pea plants in the population. The data will help to understand the genetic structure of the population and can be used to predict future generations' genotypic frequencies, providing insight into the distribution of phenotypes.
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Final answer:
The genotypic frequencies for PP, Pp, and pp in a population of 900 pea plants are approximately 58.89%, 27.78%, and 13.33%, respectively.
Explanation:
To determine the genotypic frequency in the population of pea plants for PP, Pp, and pp individuals, one must divide the number of individuals with each genotype by the total population size. In this population of 900 pea plants, we are given that 530 are homozygous purple (PP), 250 are heterozygous purple (Pp), and 120 are homozygous white (pp).
For PP: The genotypic frequency is 530 / 900 = 0.5889 (or about 58.89%).For Pp: The genotypic frequency is 250 / 900 = 0.2778 (or about 27.78%).For pp: The genotypic frequency is 120 / 900 = 0.1333 (or about 13.33%).These frequencies are important to know as they provide insights into the genetic structure of the population and can predict phenotypic ratios for future generations if the population is closed and Mendelian inheritance applies.
What annotations help how can survive a hurricane?
(use your own words)
A researcher is testing a new antiviral agent that reduces the severity of a highly contagious strain of the flu virus. She has found that the antiviral agent only it administered within 48 hours of the onset of symptoms. This information would lead the researcher to believe the virus
Answer:virus is at its infant stage for the first 2days and develop into adulthood afterwards hence the virus becomes resistant to the antiviral agent.
Explanation:
A series of strong storms opened a stream channel between two lakes. The western lake contains a large, diverse population of a species of minnow. The eastern lake has never been populated by fish. When the channel opened, a small group of fish migrated to the eastern lake. Soon after, the stream channel dried up and was never opened again. The fish in the eastern lake thrived and continued to reproduce, building a large population over time. Compared with the fish in the western lake, what characteristics would you expect the population in the eastern lake to exhibit?
Answer:
Minnow from the eastern lake will exhibit characteristics similar to the small group of migrants
Explanation:
The principle of inheritance indicates that related individuals will have similar phenotypes to their ancestors because they have the same genes
Which of the following are NOT correctly matched?
A. severe combined immunodeficiency syndrome (SCID): genetic defect resulting in a shortage of B and/or T cells
B. multiple sclerosis: autoimmune disorder
C. immediate hypersensitivity: allergic contact dermatitis
D. AIDS (acquired immune deficiency syndrome): helper T cells are destroyed by a virus
Answer: immediate hypersensitivity: allergic contact dermatitis
Explanation:
How is a generic embryonic cell different from a differentiated cell?
Choose 1 answer:
Choose 1 answer:
(Choice A)
A
A differentiated cell has a specific structure to perform a particular function.
(Choice B)
B
A generic embryonic cell can only be found in later stages of development.
(Choice C)
C
A generic embryonic cell undergoes meiosis while a differentiated cell undergoes mitosis.
(Choice D)
D
A differentiated cell is diploid, while a generic embryonic cell is haploid.
Answer:
How is a generic embryonic cell different from a differentiated cell?
differentiated cell has a specific structure to perform a particular function.
Explanation:
Answer:
A differentiated cell has a specific structure to perform a particular function.
Explanation:
During development, cells become more and more different from one another so they can be specialized for specific functions
Climate change may cause the populations of some species to increase and expand their range of distribution. Explain why this change can be positive for the species but negative for the ecosystems it invades.
Answer:
Here’s one possible answer:
An increase in the population of a species increases the chances of survival for that species. The species will be able to survive severe changes such as diseases and disasters. However, if the species moves into a new area, competition will increase for the species already in that area. The increased competition will negatively affect these other species.
Explanation:
What would be a likely outcome to the nitrogen cycle, if the population of nitrifying bacterial severely decreased?
An increase in the production of nitrites would occur
An increase in production of nitrates would be formed
An increase in the amount of ammonium present in the soil
An increase in the population size of denitrifying bacteria
If the population of nitrifying bacteria severely decreased, there would likely be an increase in the amount of ammonium present in the soil. Therefore, option (C) is correct.
What is nitrogen cycle?The nitrogen cycle is the process by which nitrogen is converted into different chemical forms as it circulates through ecosystems. Nitrifying bacteria change ammonium (NH4+) into nitrite (NO2-) and then into nitrate (NO3-), which plants can use to make DNA and amino acids, which are important biomolecules.
If there were less nitrifying bacteria, it would take longer for ammonium to turn into nitrite and nitrate. This would cause ammonium to build up in the soil. This could make plants and other living things sick, and if the extra ammonium gets into nearby bodies of water, it could change the way aquatic ecosystems work. Nitrifying bacteria would not cause more nitrites or nitrates to be made if they were killed off in large numbers, because these compounds are the end result of the nitrification process. Lastly, the number of denitrifying bacteria may grow, but this would not be a direct result of the number of nitrifying bacteria going down.
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Evolution can be described as the change in ___ frequencies of a ___ over time. The process of natural selection acts on specific ____ and causes a change in the frequency of the alleles that produce them. A population of organisms with similar phenotypes that interbreed is defined as a ___. Note that ___ evolve, not individuals.
Evolution can be described as the change in the allele frequencies of a gene pool over time. The process of natural selection acts on specific phenotypes and causes a change in the frequency of the alleles that produce them. A population of organisms with similar phenotypes that interbreed is defined as a species. Note that species evolve, not individuals.
Explanation:
Evolution is the gradual change in species over time due to selective response processes.
Natural selection of species leads to overproduction of species, variation or habitability of heritable characteristics, selection of inherited traits or phenotypes which aid the species to better suit to their environment, and to enhance and maintain the species fitness to survive and thrive in their environment.
Natural selection leads to genetic drift or shift in the gene pool to develop favorable phenotypes under random circumstances through bottleneck or founder effects.
The frequency distribution of phenotyes follows a bell curve due to either directional, stabilizing, or disruptive natural selection processes. The group or population with similar type of traits or phenotypes which can interbreed among themselves are collectively called as species.
The evolutionary changes are exhibited or observed in the species as a whole and not in an individual organism due to evolutionary processes like co-evolution, divergent and convergent evolution.
Explain why excess nitrogen in the water can lead to fewer fish and shrimp
Answer:
Excess nitrogen can cause over-stimulation of growth of aquatic plants and algae. Excessive growth of these organisms, in turn, can clog water intakes, use up dissolved oxygen as they decompose, and block light to deeper waters. So few organisms live in these conditions or even can suffocate and die.
Final answer:
Excess nitrogen in aquatic ecosystems from fertilizer runoff and sewage leads to algal blooms, which deplete dissolved oxygen when the algae die and decay. This oxygen depletion causes the death of aquatic organisms like fish and shrimp, resulting in fewer of these animals in water bodies affected by these pollutants.
Explanation:
Excess nitrogen in the water can lead to fewer fish and shrimp because it causes the overgrowth of algae, a phenomenon often referred to as an algal bloom. When these algae die, they are decomposed by bacteria, a process that depletes the water of dissolved oxygen. This reduction in oxygen levels can suffocate aquatic life, leading to the death of organisms such as shellfish and finfish. As oxygen levels continue to fall, these areas can become 'dead zones' where most aquatic life cannot survive, resulting in significant decreases in fish and shrimp populations.
This process is exacerbated by excessive amounts of phosphorus and nitrogen that enter waterways through fertilizer runoff and sewage discharge, enhancing the growth of microorganisms and leading to the decline of ecosystem fauna. These nutrient-rich pollutants promote the algae's growth, which in turn triggers the deoxygenation of the water as the algae die and decay, creating a negative impact on aquatic ecosystems, particularly during the warmer summer months.
5. How could you increase the power of a wave in a spring?
Answer:
A. Increase the amplitude. B. Increase the frequency. C. Increase the tension on the spring.
Explanation:
all of the above
Final answer:
To increase the power of a wave in a spring, increase its amplitude as power is proportional to the amplitude squared. Increasing rigidity, such as by holding a ruler at its midpoint, also affects wave properties. For resonant frequency, altering the length of the air column by adding water increases the frequency.
Explanation:
To increase the power of a wave in a spring, you can modify several variables that affect the energy of the wave. Power in a wave is directly proportional to the square of the amplitude, so increasing the amplitude of the wave can significantly increase its power. Moreover, to exemplify the concept, if we want to increase the rigidity of a simple experiment like bending and releasing a ruler, one way is to hold the ruler at its midpoint instead of the end. This modifies the length of the oscillating part and makes the system more rigid, which would effectively alter the wave properties. Additionally, you could change the material of the ruler to one with a higher Young's modulus, which would also increase rigidity.
A solar and wind power challenge is that it is