RNA splicing provides an opportunity for regulating gene expression because:
A. the same exons may be spliced together in
different sequences to produce different
proteins from the same primary transcript.
B. the same introns may be spliced together
in different sequences to produce different
proteins from the same primary transcript.
C. a spliceosome in one cell can "see" as an
intron what another spliceosome in another
cell "sees" as an exon, allowing different
proteins to be produced from the same
primary transcript.
D. methylation of spliceosomes controls how
rapidly primary transcripts are processed and
sent to the cytoplasm.
E. methylation of the polyA tail controls how
rapidly the primary transcript can be broken
up and spliced back together again.
C
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When the chromosomes do not separate properly it is called ________
a. nondisjunction b. polyploidy c. monosomic d. trisomic e. aneuploidy
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Choose the letter of the best match: A. third trimester of pregnancy B. second month of pregnancy C. first month of pregnancy D. second trimester of pregnancy E. third month of pregnancy
In a certain breed of chicken, an incomplete
dominant gene controls color. The homozygous black, when crossed with the homozygous splashedwhite, produces an intermediate gray color pattern referred to as blue. A second gene controls the shape of the comb. The dominant allele (R) produces rose, whereas the recessive allele (r) produces single. Give the F1 and F2 genotypic and phenotypic ratios of a cross between a pure-breeding black single and a pure-breeding splashed-white rose. What will be an ideal response?
The complement cascade and its by-products contribute to
A) attracting phagocytes to sites of infection. B) triggering inflammation. C) triggering release of interferons. D) triggering inflammation and release of interferons. E) both triggering inflammation and attracting phagocytes to sites of infection.