What emerging science studies environmentally induced modifications of a gene's activity that do not involve a change in the gene's DNA code?
a. gene modification theory
b. epigenetics
c. geneticology
d. modified genetics
e. intragenetics
b
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Platelets participate in hemostasis by
A. secreting nitric oxide and releasing chemicals that promote vasoconstriction. B. aggregating to form a plug and manufacturing fibrinogen. C. aggregating to form a plug and releasing chemicals that promote vasoconstriction. D. secreting tissue plasminogen activator (t-PA) whenever they come into contact with collagen. E. secreting prostacyclin, which prevents platelet aggregation on blood vessel endothelium.
The right atrioventricular valve (tricuspid) regulates the opening between the ________ and the ________.
A. right atrium; left atrium B. left ventricle; right ventricle C. right atrium; left ventricle D. left atrium; left ventricle E. right atrium; right ventricle
Certain cells in the liver ingest bacteria and debris from damaged cells by a process called ________.
A. biocytosis B. pinocytosis C. phagocytosis D. exocytosis E. diffusion
After the nephron loop, where in the renal tubule would a urea molecule drain into next?
A) Vasa recta B) Proximal tubule C) Distal tubule D) Glomerulus