One of the reasons that pufferfish are a good species to compare to humans is because
A. they are so distantly related that it's easy to distinguish mutually conserved sequences.
B. it is so easy to hybridize the two and investigate the consequences.
C. they have been separated for so many millions of years and yet the gene sequence is almost identical.
D. of the rapid response time in pufferfish to artificial selection.
E. the introns are often identical.
Answer: A
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On which of the following infections would antibiotics most likely be effective?
1.chlamydia 2.HPV 3.syphilis 4.gonorrhea
Active immunity may be produced by
a) having a disease b) receiving a vaccine c) receiving gamma globulin injections d) both a and b e) both B and C are correct
Why does conjugation with an Hfr donor result in a much higher rate of gene transfer than conjugation with an F+ donor?
A) An F+ donor makes fewer pili. B) An F+ donor's T strand is slow to reach the pilus. C) The Hfr donor transfers genes from the chromosome and not the plasmid. D) The Hfr donor segment must undergo recombination in the recipient. E) The F+ donor segment must undergo recombination in the recipient.
DNA is separated, and then duplicated, during cellular reproduction. Which process results in cells that contain slightly different combinations of genes compared to the parent cell?
A) meiosis B) mitosis C) fertilization D) cytokinesis