The event directly before the beginning of
DNA replication is
a. the S phase.
b. cytoplasmic division.
c. the G1 stage.
d. the G2 stage.
e. mitosis.
C
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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.
Which of the following occurs during alternative RNA splicing?
a. Multiple protein products are produced by one gene. b. An enzyme replaces an RNA primer with a DNA nucleotide. c. DNA is uncoiled and loosened from nucleosomes. d. RNA is transcribed and translated into protein.
What does sampling error refer to?
A) the difficulty in accurately measuring results that are incalculable B) the differences between a group of experimental subjects and the population as a whole C) the experimental results that do not support the hypothesis being tested D) the intentional biases on the part of researchers
Which of the following does not change gene frequencies in populations?
A) migration B) diet C) mutation D) selection