During muscle contractions,
a. the sarcomeres shorten.
b. the actin filaments slide over the myosin
filaments.
c. the actin filaments move toward the middle
of the sarcomere during contraction and
away on relaxation.
d. the muscle fibers thicken.
e. all of these occur
E
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An anticodon of sequence 5? GUA 3? will recognize the codon sequence
A) 5? GTA 3?. B) 5? UAC 3?. C) 5? CAU 3?. D) 5? AUG 3?. E) None of the codon sequences are correct.
Which of the following chromosomal
conditions is treated with testosterone injections?
a. XXX b. trisomy 21 c. XO d. XXY e. XYY
Weakened bones, kidney stones, and malfunctioning muscles are symptoms of
a. hyperthyroidism. b. Grave's disease. c. acromegaly. d. hyperparathyroidism. e. Wilson's disease.
One species of plant contains several different groups. Each group is slightly different from the others and capable of sexual reproduction. These groups are called
A. subspecies. B. clones. C. species. D. mutations.