In a trait with multiple alleles, an individual carries ____________________ (how many?) alleles of
the gene. Fill in the blank(s) with the appropriate word(s).
ANS: 2
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Viruses are not considered "living" by some biologists because they
a. have no metabolism. b. do not reproduce. c. cannot move. d. contain protein.
Some athletes use "blood doping," adding additional red blood cells to the blood, to achieve a competitive edge. What will the extra red blood cells do in the body?
A) make the heart beat faster B) increase O2 delivery to muscles C) decrease blood pressure D) change the blood type
A genetic signature for positive selection is
A) a gene sequence present in humans and other primates, but with at least one amino acid difference in the encoded protein in humans. B) a gene that is unique to humans. C) a gene sequence present in humans and other primates, but with no amino acid sequence differences. D) a gene that encodes a protein that makes the individual more sexually attractive.
Assuming resting conditions at sea level, what is the partial pressure of oxygen in pulmonary veins?
A) 160 mm Hg B) 46 mm Hg C) 80 mm Hg D) 40 mm Hg E) 100 mm Hg