Insulin helps regulate blood sugar at homeostatic levels by
A) stimulating alpha cells of the pancreas to produce more hormones.
B) promoting the entry of glucose into cells.
C) stimulating the breakdown of glycogen to glucose.
D) activating hormone production in the posterior pituitary gland.
E) promoting the breakdown of fat.
B
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Cleavage divisions proceed at approximately the same rate in the embryo of _______, reflecting
uniform distribution of yolk.
a. bird b. human c. sea urchin d. frog e. sea urchin and human
The accepted explanation for the disappearance of the dinosaurs is _____
a. the result of an asteroid impact b. the loss of food sources c. competition by mammals d. gas emissions from volcanoes e. giant tsunamis caused by earthquakes
Which of the following depicts the correct sequence of protein activity in clot formation?
a. thrombin ? prothrombin ? fibrinogen ? fibrin b. prothrombin ? thrombin ? fibrinogen ? fibrin c. prothrombin ? thrombin ? fibrin ? fibrinogen d. prothrombin ? thrombin ? fibrin e. prothrombin ? thrombin ? fibrinogen ? erythrocytes
Translation proceeds in a series of steps in the active site of the ribosome. Which of the following are important steps in polypeptide formation?
A. The incoming aminoacyl-tRNA forms a covalent bond with the RNA in the A site. B. The hydrogen bonds formed between ribosomal RNA and tRNAs position the aminoacyl-tRNAs to catalyze peptide bond formation. C. The tRNA holding the growing polypeptide moves from the P site to the A site after peptide bond formation. D. The RNA in the P site makes hydrogen bonds with the 3' end of the aminoacyl-tRNA.