Where is the central pacemaker that controls circadian rhythm found in many animals?
a. in the suprachiasmatic nucleus
b. in the eye
c. in the skin
d. in the optic nerve
Ans: a. in the suprachiasmatic nucleus
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Outside a host cell a virus is called a(n):
a. capsid. b. virion. c. nucleocapsid. d. envelope. e. glochidia.
Daylight in the Southern Hemisphere is longest during the winter solstice in December
Indicate whether the statement is true or false
During primary growth, auxin causes transport proteins to pump hydrogen ions from cytoplasm into the cell wall, which increases ________ and softens the cell wall.
Fill in the blank(s) with the appropriate word(s).
In the structure of ATP synthase, where do H+ ions cross the mitochondrial membrane?
A. along the stem formed by the b subunit B. through the rotating gamma subunit C. between the catalytic beta subunits D. between the transmembrane a and c subunits