The presence of cholesterol in the plasma membranes of some animal cells _____
A) enables the membranes to stay fluid when cell temperature drops
B) enables the cell to remove hydrogen atoms from saturated phospholipids
C) enables the cell to add hydrogen atoms to unsaturated phospholipids
D) makes the cell membrane less flexible, allowing it to sustain greater intracellular pressure
E) reduces mutations to genetic material inside the cell
Answer: A
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Copies of chromosomes linked together at their centromeres at the beginning of meiosis are called ____ chromatids
a. mother b. daughter c. sister d. homologous e. duplicated
What might happen to your red blood cells if you were suddenly unable to regulate the solute concentration of your blood and it began to rise?
A. Your blood cells would shrivel because water would move out of the cells via osmosis. B. Your blood cells would stay the same size. C. Your blood cells would enlarge and could rupture because water would move into the cells via osmosis. D. We do not have enough information to answer this question.
Answer true or false. Okazaki fragments are synthesized during DNA replication of the lagging strand. This mode of replication is necessary because the direction of DNA synthesis on the lagging strand is opposite to the direction of movement of the replication fork.
a. true b. false
Which of these hormone-action pairs is mismatched?
A. Oxytocin-suckling B. Cortisol-glucose regulation C. Aldosterone-sodium reabsorption D. Atrial natriuretic peptide-muscle contraction E. Testosterone-secondary sex characteristics