When Nitrobacter utilizes nitrite produced from ammonia by Nitrosomonas to obtain energy by converting the nitrite to nitrate, the relationship between the two organisms is
A. mutual.
B. commensal.
C. amensal.
D. parasitic.
Answer: B
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A researcher lacked the necessary equipment to measure methane production so instead monitored CO2 concentration as the unknown archaeon grew and produced methane. Why might CO2 NOT decrease but methane still increase?
A) An alternative carbon source such as methanol was used. B) CO2 is not a carbon source used by methanogens. C) CO2 was used an electron donor but not as a carbon substrate. D) Methanogenic Archaea containing carboxysomes likely made measuring small losses of CO2 difficult to conclude.
________ are the units of muscle contraction. a. Actin b. Myofibrils c. Myosin d. None of these choices
e. Sarcomeres
Which of the following develops into a seed?
a. megaspore b. ovary c. egg d. ovule e. anther
After several generations of selectively breeding mice in a laboratory, Ted Garland and his colleagues established populations of mice that voluntarily chose to run great distances on exercise wheels
The process of establishing these populations of mice is termed ________. A) natural selection B) artificial selection C) population selection D) experimental selection E) random selection