What type of cells do not undergo mitosis?
A) All cells of the body except gametes (i.e., only somatic cells)
B) Gametes
C) Both somatic cells of the body and gametes
D) Neither somatic cells of the body nor gametes
B
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A hormone binds a receptor and activates the cAMP signal transduction pathway ultimately leading to the cell response. If you wanted to develop a drug to block this pathway, the drug would need to inhibit _____
A. hormone release from the receptor. B. adenylyl cyclase. C. protein phosphatases remove phosphates from proteins initially activated by protein kinase A. D. GTP on the alpha subunit of the G protein being hydrolyzed to GDP. E. phosphodiesterase.
As the polypeptide is elongating in translation,
what is the ribosome doing?
a. removing incorrectly added amino acids. b. moving along the mRNA transcript bonding amino acids to each other. c. travelling back and forth between the nucleus and the growing polypeptide with information on which amino acids to add. d. removing the non-coding introns. e. doing more than one of these functions
The nucleoside triphosphate molecules in DNA are linked together in the 5'?3' by a(n) ________ bridge
A) phosphate B) covalent C) phosphodiester D) peptide E) phosphatidyl
Circulating antibodies are produced by
A. all cells in the immune system. B. phagocytes alone. C. B cells. D. T cells alone. E. macrophages.