Photosynthesis and cellular respiration are both complementary and relatively balanced, but early history of life on Earth showed increasing oxygen concentrations. This indicates that
a. both photosynthesis and respiration were occurring at approximately the same levels.
b. neither photosynthesis nor respiration were occurring.
c. the amount of photosynthesis occurring exceeded the amount of cellular respiration.
d. the amount of cellular respiration occurring exceeded the amount of photosynthesis.
Ans: c. the amount of photosynthesis occurring exceeded the amount of cellular respiration.
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a. anaphase. b. metaphase. c. interphase. d. prophase. e. telophase.
The genes of a single operon are all regulated by the same repressor, operator, and promoter.
Answer the following statement true (T) or false (F)
Two linked genes, (A) and (B), are separated by 36 m.u. A man with genotype Aa Bb marries a woman who is aa bb. The man's father was AA BB. What is the probability that their first child will be Aa bb?
A. 18% B. 9% C. 25% D. 36% E. 50%
The outermost layer of a virion fulfills which of the following functions of the virus?
A. protection B. recognition C. replication D. both protection and recognition E. both recognition and replication