________ occurs as ________ builds up in the system if Enzyme A is nonfunctional because of an inherited mutation. 
A. albinism; melanin
B. androgen insensitivity; tyrosine
C. xeroderma pigmentosum; tyrosine
D. phenylketonuria; phenyalanine
Answer: D
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The genotype of an organism constitutes its observable characteristics
A. true B. false
The utricle is especially sensitive to what type of movements?
A. up and down B. standing upright C. bending over D. back and forth E. spinning around
During a stressful interval, _____
A) thyroid-stimulating hormaon (TSH) stimulates the adrenal cortex and medulla to secrete acetylcholine B) the alpha cells of islets secrete insulin and simultaneously the beta cells of the islets secrete glucagon C) adrenocorticotropic hormone (ACTH) stimulates the adrenal cortex, and neurons of the sympathetic nervous system stimulate the adrenal medulla D) the posterior pituitary gland secretes more growth hormones E) the calcium levels in the blood are increased due to actions of two antagonistic hormones, epinephrine and norepinephrine
Which of the following damaged templates encountered by a replication fork is repaired by double-strand break repair?
A. The replication fork encounters a lesion and translesion synthesis occurs. B. The replication fork encounters a lesion and stalls. C. The replication fork encounters a lesion and bypasses it, restarting synthesis on the other side of the lesion. D. The replication fork encounters a lesion at which repair has been initiated and the fork collapses. E. The replication fork encounters heteroduplex DNA.