What type of noncoding DNA comprises the largest portion of multicellular eukaryotic genomes?
a) introns
b) pseudogenes
c) transposons
d) gene regulatory sequences
e) centromeric sequences
Answer: c) transposons
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David Pribnow studied the base sequences of promoters in bacteria and bacterial viruses. He found two conserved regions in these promoters (the -10 box and the -35 box). These two regions of the promoter _____
A) signal the initiation site B) bind the sigma subunit that is associated with RNA polymerase C) attach the correct nucleotide triphosphate to the template DNA strand D) separate the two DNA strands
You observe a microbiologist examining two plates and notice the pattern of colonies are nearly identical with the exception of a few colonies that are absent on one of them. The plates likely were produced by
A) positive selection culturing. B) replica plating. C) pour plating. D) streak plating. E) the Ames test.
All of the following are correct about helminths except
A. they are not all parasites, although some are. B. as parasites, their reproductive organs are their most developed organs. C. they generally make only a few eggs per day. D. tapeworms and pinworms are two examples. E. their eggs and larvae are vulnerable to heat.
Which of the following is NOT a unique characteristic of chordates at some time in their life history?
Select one: a. a dorsal notochord b. a ventral hollow nerve cord c. pharyngeal pouches d. gill clefts e. a postanal tail