How many electrons are involved in a triple covalent bond?
A) 3
B) 6
C) 9
D) 12
Ans: B) 6
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The photosynthetic pigments bacteriorhodopsin and proteorhodopsin are present in ________ and ________, respectively
A) Archaea / Bacteria B) Bacteria / Archaea C) Bacteria / Bacteria D) Bacteria / Eukarya
How does the RecA protein contribute to the increased expression of SOS genes?
A. RecA protein competes with LexA protein for binding to the operator sequences. B. RecA protein binds to LexA protein bound to the operator, directly lowering the affinity of LexA protein for DNA. C. RecA protein binds to free LexA protein, mediating the self-cleavage of the repressor. D. RecA protein binding to the promoter region recruits RNA polymerase.
Stress increases the risk of heart disease because unused fat cells released during the stress response may _____.
A. erode the muscles of the heart B. force the heart to beat too rapidly C. be deposited on and block coronary arteries D. increase HDL cholesterol levels
The lymphocytes of adaptive immunity called ________ mature in the red bone marrow
A) T cells B) B cells C) NK cells D) dendritic cells E) macrophages