Which of the following statements about cellulose is false?
(a) Cellulose synthase enzyme complexes are integral membrane proteins.
(b) An array of microtubules guides the cellulose synthase complex as it moves in the membrane.
(c) The sugar monomers necessary for the synthesis of a cellulose polymer are transported across the plasma membrane.
(d) Microtubules are directly attached to the outside surface of the plasma membraneto form tracks that help orient the cellulose polymers.
(d) In plants, the microtubules are directly attached to the plasma membrane inside the cell to form tracks that guide the movement of cellulose synthase and thus affect the orientation of the cellulose polymers outside the cell.
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In HIV, RNA is transcribed to DNA by:
A. matrix. B. reverse transcriptase. C. surface glycoprotein. D. capsid. E. integrase.
In humans, ability to roll the tongue (R) is dominant to being unable to roll (r). Having freckles (F) is dominant to having no freckles (f)
If a woman heterozygous for both traits married a man with no freckles who couldn't roll his tongue, what is the probability that they would have a freckled, tongue-rolling child? A. 9/16 B. 3/16 C. 1/16 D. 3/4 E. 1/4
The semilunar valves prevent blood from moving:a
from the atria back into the veins. b. from the ventricles back into the atria. c. from the arteries back into the ventricles. d. moving backwards in the capillaries. e. moving backward in the arteries.
Sperm are formed originally in the ________
A) vas deferens B) bulbourethral glands C) seminiferous tubules D) prostate gland