The _______ cycle begins with the weathering of rock.
A. phosphorus
B. nitrogen
C. water
D. energy
E. carbon
Ans: A. phosphorus
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A scientist wants to perform a test that will indicate whether a nucleic acid sample is composed of RNA or DNA. Testing for the presence of which of the following is most appropriate in this situation?
A) phosphate B) nitrogen C) guanine D) uracil E) thymine
One would predict that bacteria that lack the enzyme photolyase would be more sensitive to what kind of mutagen?
A) intercalating agents B) alkylating agents C) reactive oxygen species D) UV light E) base analog
Why do more marine mammal offspring survive to adulthood than other animals? a. They expend high amounts of energy
b. They have a high metabolic rate. c. They give a high level of parental care. d. They have fewer offspring.
How often does the replacement of the epidermis occur?
A) only once in a person's lifetime B) every 4-6 years C) every 4-6 weeks D) every 4-6 days