The ability of a postsynaptic cell to respond to a neurotransmitter depends upon:
A. an action potential in the presynaptic cell.
B. release of neurotransmitter from the
presynaptic cell.
C. presence of receptors on the postsynaptic
cell.
D. All of the answer options are correct.
D
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A) interphase B) prophase C) metaphase D) anaphase
The practice of breeding plants and animals for desirable traits, such as high crop yield, is called natural selection
Indicate whether the statement is true or false
Which of the following is a protein activated during apoptosis?
A. chimeric gene B. transposase C. caspase D. growth factor E. oncogene
Imagine two populations of snails that are polymorphic for sexual reproduction. In each of the two popula-tions, several asexual lineages and a panmictic, sexually reproducing subpopulation of snails are living in the same environment
Several years ago, a new pathogen was detected in the first population. This pathogen is predominantly transmitted between parents and their offspring, but on occasion it is also transmitted horizontally between unrelated individuals. The pathogen is now infecting both sexual and asexual individuals. Since the introduc-tion of the pathogen, the formerly stable ratio of sexual vs. asexual snails has shifted significantly in favor of the sexually reproducing individuals. The second population became at the same time infected with a patho-gen that is almost always transmitted horizontally. In the second population, no shift in the ratio of sexuals vs. asexuals has been observed. Speculate on why the difference in transmission between the two pathogens may have shifted the proportion of sexual reproduction in the first but not in the second population. Limit your answer to one to two sentences. What will be an ideal response?