Which of the following controls fluid balance by reabsorption of water and sodium?
A) aldosterone
B) antidiuretic hormone
C) osmoreceptors
D) chemoreceptors
Answer: A) aldosterone
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Histamines
a. are produced by phagocytes to cause mucous production. b. are produced by mast cells to cause prostaglandin production. c. are produced by complement to attract phagocytes. d. are produced by mast cells to cause capillary dilation. e. are produced by complement to cause capillary constriction.
In the biology lab, you observe animal cells under a microscope. In one slide you see the nucleus with two nucleolus areas of compact chromatin. The value in packaging DNA in tighter forms of chromatin is for
A. regulation and protection of the DNA during transcription. B. ensuring that sister chromatids will be attached prior to replication. C. mobility and protection of the DNA molecule during mitosis. D. prevention of ligase enzyme action during replication. E. Both DNA mobility and protection and regulation in mitosis and transcription.
What is the association between tropomyosin and troponin molecules in resting striated muscle fibers?
A. Tropomyosin holds the troponin in place on the actin. B. There is no known association. C. Troponin holds the tropomyosin in place on the actin. D. Troponin holds the tropomyosin in place on the myosin. E. Tropomyosin holds the troponin in place on the myosin.
Why does the activation of a protein kinase that acts on initiation factor eIF2 block protein synthesis?
a) Phosphorylated eIF2 denatures. b) Phosphorylated eIF2 cannot exchange its GDP for GTP, which is required for eIF2 to participate in another round of translation initiation. c) Dephosphorylated eIF2 cannot exchange its GDP for GTP, which is required for eIF2 to participate in another round of translation initiation. d) Phosphorylated eIF2 is hyperactivated, blocking further translation. e) Phosphorylated eIF2 cannot exchange its GTP for GDP, which is required for eIF2 to participate in another round of translation initiation.