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.
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
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