The molecule in the accompanying figure is mannose, an example of a ____ sugar
a. triose
b. hexose
c. pentose
d. heptose
e. tetrose
ANSWER: b
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Suppose you recreate Jagendorf and Uribe's chloroplast experiment with one small change: after
placing the chloroplasts (in the dark) in an acidic medium to fill the thylakoid membrane with protons, you move the chloroplasts to a stronger acid rather than the basic solution used in the original experiment. What would be the outcome of your experiment?
a. ATP synthesis would still occur because a proton gradient was created. b. ATP synthesis would occur but at a slower rate because of the strength of the acid. c. ATP synthesis would not occur because the protons would reach equilibrium on both sides of the thylakoid membrane and, thus, be unable to drive the activity of ATP synthase. d. ATP synthesis would not occur because the acid is too strong and would rupture the thylakoid membrane. e. ATP synthesis would occur, but only until the protons reached equilibrium.
Which element is NOT characteristic of the primary structure of proteins?
a. carbon b. hydrogen c. phosphorus d. sulfur e. nitrogen
The nucleotide sequence of a gene is ____
a. made from amino acids b. found in the DNA backbone c. found on both sides of the DNA molecule d. the code for the sequence of amino acids for a polypeptide e. larger than a chromosome
Which phenomenon is a likely consequence of thinning of the ozone layer?
A) more occurrences of skin cancer B) greater escape of heat from Earth C) global warming D) smaller flying insect populations