Organisms such as lizards that need to maintain body temperature through external means do so by
A. running frequently to warm up.
B. sunbathing.
C. swimming in geothermal pools.
D. eating large meals to provide calories for heat production.
E. shivering to produce heat.
Answer: B
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For a science fair project, two students decided to repeat the Hershey and Chase experiment, with modifications. They decided to label the nitrogen of the DNA, rather than the phosphate. They reasoned that each nucleotide has only one phosphate
and two to five nitrogens. Thus, labeling the nitrogens would provide a stronger signal than labeling the phosphates. Why won't this experiment work? A) There is no radioactive isotope of nitrogen. B) Radioactive nitrogen has a half-life of 100,000 years, and the material would be too dangerous for too long. C) Although there are more nitrogens in a nucleotide, labeled phosphates actually have sixteen extra neutrons; therefore, they are more radioactive. D) Amino acids (and thus proteins) also have nitrogen atoms; thus, the radioactivity would not distinguish between DNA and proteins.
Reinforcement refers to the development of ________-zygotic factors and is typically more rapid in species living in __________
A. pre; allopatry B. pre; sympatry C. post; allopatry D. post; sympatry
The ability of a postsynaptic cell to respond to a neurotransmitter depends upon:
A. an action potential in the presynaptic cell. B. release of neurotransmitter from the presynaptic cell. C. presence of receptors on the postsynaptic cell. D. All of the answer options are correct.
A plant tissue that protects against water loss is the
a. epidermis. b. fibers. c. parenchyma. d. xylem