Originally, HIV was thought to be restricted to transmission during homosexual contact between gay men. List other ways in which HIV is currently known to be transmitted
What will be an ideal response?
HIV can be transmitted by heterosexual sex, oral sex, needle sharing, transfusion with contaminated blood products, other unsafe medical procedures, childbirth and breast-feeding.
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A potassium ion gradient is set up in insect Malpighian tubules through an active transport process. As a result, potassium concentration is higher in the lumen of the tubules than in hemolymph. How would the potassium gradient affect water movement?
A) Water would be forced out of the lumen of the Malpighian tubules through an osmotic gradient. B) The potassium gradient would have no effect on water movement. C) There would be a net movement of water into the lumen of the tubules. D) Water would be conserved, forming a hypertonic solution in the Malpighian tubules.
Which of the following pairs of traits are homologous?
a. butterfly wings and bat wings b. the surface areas of bird and bat wings c. the bones of bird and bat wings d. butterfly wings and bird wings e. bird wings and bat wings
In estimating the effect of price on sales, what is likely to be a confounding factor that one would at best have only a proxy variable for?
A. Brand awareness B. Month C. Sales D. Price
What are the products made during glycolysis?
A) 2 pyruvic acid B) 4 ATP (net gain of 2 ) and 2 NADH and 2 pyruvic acid C) 2 NADH D) 4 ATP (net gain of 2 ) and 2 NADH E) 4 ATP (net gain of 2 )