Which statement ,begin emphasis,best,end emphasis, describes how an external factor can produce a genetic mutation?
Answer options with 4 options
A.
Ultraviolet light causes a change to a nucleotide base that is copied when DNA replicates.
B.
Bacteria in polluted water rearranges nucleotide base pairs within DNA to produce new traits in a population.
C.
Solar radiation changes the DNA of an individual, resulting in the following generation becoming a new species.
D.
Strong chemicals penetrate cell membranes and dissolve nucleotide bases within the DNA, resulting in a new type of cell.
A. Ultraviolet light causes a change to a nucleotide base that is copied when DNA replicates.
Why is the number of producers usually much greater than the number of other organisms in an ecosystem?
Answer options with 4 options
A.
Producers have access to more nutrients than other organisms do.
B.
Competition for resources is greater for other organisms than for producers.
C.
Producers need to provide enough energy to satisfy the needs of other organisms.
D.
Available energy decreases as it is transferred from producers to other organisms.
C. Producers need to provide enough energy to satisfy the needs of other organisms.
Which relationship is an example of commensalism?
Answer options with 4 options
A.
Deer and dogs are hosts to ticks that suck out small quantities of blood for nourishment.
B.
Plants produce brightly colored flowers with nectar, which attract insects to pollinate them.
C.
Acacia ants live on and protect the acacia tree, and they eat the nectar provided by the tree.
D.
Cattle egrets follow livestock and eat insects that are disturbed by the livestock's movement.
D. Cattle egrets follow livestock and eat insects that are disturbed by the livestock's movement.
Not all mutations are passed on to offspring. Mutations in somatic cells can affect the organism and are not passed on.
What is the relationship between mutations in the somatic cell and the cell cycle?
Answer options with 5 options
A.
The cell cycle fixes the mutations and makes exact copies of the original cell.
B.
The cell cycle duplicates every gene except the mutated genes involved with cell function.
C.
The cell cycle becomes stuck in the first stage of the cycle, preventing the cell from duplicating.
D.
The cell cycle produces more of the proteins that the cell needs to function due to the mutation.
E.
The cell cycle makes exact copies of the mutated cells, which can cause cancer, among other problems.
E. The cell cycle makes exact copies of the mutated cells, which can cause cancer, among other problems.
Which scenario shows evidence that competition for limited resources affects the population of a species?
Answer options with 4 options
A.
A population of grasshoppers destroys large fields of crops.
B.
The mouse population in an area increases as the fox population decreases.
C.
The deer population on an island rises steadily and then levels out for many years.
D.
The population of geese in an area decreases when they migrate south for the wint
A. A population of grasshoppers destroys large fields of crops.
To determine the "best" statement that describes how an external factor can produce a genetic mutation, you need to evaluate the accuracy and plausibility of each option.
A. Ultraviolet light causes a change to a nucleotide base that is copied when DNA replicates.
Explanation: This statement describes how ultraviolet (UV) light can induce a change in the nucleotide bases of DNA during replication, leading to a mutation. UV light is a known mutagen, and its effects on DNA are well-documented. When DNA is replicated, any changes to the nucleotide bases can be inherited by the new copies, potentially resulting in a mutation.
B. Bacteria in polluted water rearranges nucleotide base pairs within DNA to produce new traits in a population.
Explanation: This statement suggests that bacteria in polluted water can directly rearrange nucleotide base pairs within DNA, leading to the emergence of new traits in a population. While bacteria can transfer genetic material through horizontal gene transfer, it is less likely that they can rearrange base pairs directly within the DNA of another organism. This option seems less plausible when compared to others.
C. Solar radiation changes the DNA of an individual, resulting in the following generation becoming a new species.
Explanation: This statement implies that solar radiation can cause changes in the DNA of an individual, leading to the subsequent generation becoming a new species. While radiation can cause genetic mutations, such as DNA damage, it is unlikely that a single individual's DNA change would result in the formation of an entirely new species in the subsequent generation. This option appears unlikely.
D. Strong chemicals penetrate cell membranes and dissolve nucleotide bases within the DNA, resulting in a new type of cell.
Explanation: This statement suggests that strong chemicals can penetrate cell membranes and dissolve nucleotide bases within DNA, leading to the emergence of a new type of cell. While certain chemicals can cause DNA damage, it is less likely that they can dissolve nucleotide bases within the DNA molecule entirely. This option also seems less plausible compared to the others.
Based on the evaluation, option A, "Ultraviolet light causes a change to a nucleotide base that is copied when DNA replicates," is the best description of how an external factor can produce a genetic mutation. This statement accurately reflects that UV light can cause changes to nucleotide bases that are then replicated during DNA replication, leading to genetic mutations.