The anatomical structure identified with the letter "R" in the figure above is the ____
a. pericardium
b. cardiac muscle
c. inferior vena cava
d. right atrium
e. heart apex
ANSWER: b
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Self-propagation and refractory periods (states) are typical of _____
A) action potentials B) graded hyperpolarizations C) excitatory postsynaptic potentials D) threshold potentials E) resting potentials
Natural selection operates directly on
(a) the genotype. (b) individual alleles. (c) the phenotype. (d) color only.
A cross of a true-breeding smooth pod and yellow pod plants results in all smooth pod offspring. This indicates that
A. yellow is dominant and smooth is recessive. B. smooth is dominant and yellow is recessive. C. yellow and smooth are not alleles. D. yellow and smooth are variants of the same gene. E. two of the answers are correct. Yellow and smooth are variants of the same gene, and smooth is the dominant trait.
If a patient has high blood sugar characterized with insulin resistance, they are diagnosed with
A. type 2 diabetes. B. goiter. C. hypoglycemia. D. diverticulitis.