In red blood cells, carbon dioxide binds directly to the
a. heme group.
b. iron atom.
c. oxygen molecule.
d. the globin chains.
e. magnesium atom.
D
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In regions where malaria is prevalent, individuals who are _____ for the S (sickling) allele have a selective advantage
A. heterozygous for the S (sickling) allele B. homozygous for the S (sickling) allele C. heterozygous for the A (nonmutant) allele D. homozygous for the A (nonmutant) allele
An organism isolated from a sputum sample that has a "hockey puck" consistency would have which of the following biochemical profiles?
a. Glucose-positive, maltose-positive, and lactose-positive b. Glucose-positive, maltose-positive, and lactose-negative c. Glucose-positive, maltose-negative, and lactose-negative d. Glucose-negative, maltose-negative, and lactose-negative
The class of neurotransmitters that most commonly acts as a modulator of postsynaptic cell response are the
A. amino acids. B. gases such as nitric oxide. C. neuropeptides. D. biogenic amines. E. acetylcholine.
Which of the lakes in the accompanying figure may have a thermocline?
a. 1 b. 2 c. 4 d. 1 and 3 e. 2 and 4