Which of the following is not true of the reactions that methylate the 5' end of the primary mRNA transcripts?
A. The reaction occurs after the entire transcript is synthesized.
B. The methyl groups are derived from S-adenosylmethionine.
C. The enzymes that catalyze the reactions are guanylyltransferases.
D. The enzymes that catalyze the reactions are associated with the C-terminal domain of RNA polymerase II.
A
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Which of the following characteristics are shared by all worm phyla?
A. Displaying bilateral symmetry B. Being heterotroph C. Having tissues D. All of the above are characteristics shared by all worm phyla
How does the digestive system respond when food enters the small intestine?
1.Increasing salivary secretions 2.Increasing stomach contractions 3.Decreasing release of insulin 4.Increased release of cholecystokinin
Sometimes domesticated plants and animals are released into the wild, where they breed, survive, and populate. Which of the following statements is true?
A. Because populations are heavily monitored by humans for disease there are few deleterious alleles found in most domesticated populations. B. They tend to perform very well as often the traits chosen for by humans have created bigger, stronger, and healthier populations that outcompete wild ones. C. There appears to be little difference between long-term survival of domesticated and wild species when both are left in the wild. D. Because domestic populations often come from a few individuals, deleterious alleles are allowed to drift to a high frequency which inhibits their ability to survive in the wild.
A class of mutations that results in multiple contiguous amino acid changes in proteins is likely to be which of the following?
A) transition B) transversion C) base analog D) recombinant E) frameshift