The nuclear envelope's structure is a
A. solid single-layered membrane.
B. solid double-layered membrane.
C. single-layered membrane with pores.
D. double-layered membrane with pores.
Answer: D
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What is the role of calcium ions in muscle contraction?
A) form hydroxyapatite crystals B) reestablish glycogen stores C) bind to regulatory sites on troponin to remove contraction inhibition D) increase levels of myoglobin
Tissues damaged by myocardial infarction are replaced by new contractile cardiac muscle.
a. true b. false
Increased risk of infection with stress is due to.
A) vasoconstriction. B) depressed inflammatory response. C) increased cortisol secretion. D) b and c are correct.
The change in size of the bone marrow (where blood cells are produced) as an infant matures is an example of ________, whereas the transformation of blood stem cells into white blood cells is an example of ________.
A. development; differentiation B. growth; differentiation C. growth; development D. differentiation; growth E. differentiation; development