The temperature of the lower atmosphere has risen the most in the last ____
a. 60 years
b. 70 years
c. 100 years
d. 125 years
e. 150 years
ANSWER: b
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What would happen if an enzyme inhibitor for the enzyme photodiesterase (PDE) was applied to a vertebrate eye?
A) The opsins found in cones would not be differentiated into the red, blue, and green proteins, causing the animals to be color blind. B) The cGMP-gated sodium channels would remain open, glutamate would be continuously discharged at the synapses, and the brain would not detect light absorbed by the rod cells. C) The lens could not be appropriately adjusted to focus light on the retina, resulting in either nearsightedness or farsightedness. D) All of the listed responses are correct.
Dr. John Doe, a research microbiologist for a university medical center, has been accused of sending Bacillus anthracis, the causative agent of anthrax, through the mail to the President. You, as a public health official with the CDC, have to determine if it is the same strain as the two strains of B. anthracis found cultured in his lab. Which method of identification would you use to compare these three bacterial samples?
A. Pulse-field gel electrophoresis B. Biochemical test identification C. Serological testing using agglutination D. Gram staining
When Ellison and Gotelli manipulated concentrations of nutrients available to pitcher plants, what was the independent variable?
A. number of insects fed to each plant
B. ratio of the pitcher opening to pitcher length
C. ratio of the keel width to total width
D. amount of nitrogen or phosphorus added to the pitcher of each plant
E. amount of nitrogen or phosphorus added to the roots of each plant
Which statement is true?
a. The hydrogen bonding of cytosine to guanine is an example of complementary base pairing. b. Adenine always pairs up with guanine in DNA, and cytosine always teams up with thymine. c. Each of the four nucleotides in a DNA molecule has the same nitrogen-containing base. d. When adenine base pairs with thymine, they are linked by three hydrogen bonds. e. In the DNA of all species, the amount of cytosine never equals the amount of guanine.