____ is a drastic reduction in population size
brought about by severe pressure.
a. A bottle neck
b. Mutation
c. A founder effect
d. Gene flow
e. Genetic drift
A
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__________ can reveal the order of nucleotide bases in a fragment of DNA. Fill in the blank(s) with the appropriate word(s)
The best explanation for the phenotypic differences between humans and chimps despite the great similarities in their gene-coding sequences is
A. the vast differences in exons between their genomes. B. the "junk" DNA of humans contains important sequences not present in chimps. C. the vast differences in the introns between their genomes. D. differences in gene expression between species.
Siderophores:
A. Are used to detoxify oxygen intermediates in bacterial growth medium B. Are proteins that can form chelating complexes to obtain iron for an organism C. Are non-reusable forms of iron produced by the liver D. Aid in energy retention in the electron transport chin E. Control the breakdown of various organic substances
A nucleotide sequence that usually contains 5?-TAT1 . T-3? is called the
a. –35 region. b. alternative start site. c. Pribnow box or –10 region. d. transcriptional start site.