"Double fertilization" produces nutrient tissue
by the union of
a. two egg nuclei and one sperm nucleus.
b. two sperm nuclei and one egg nucleus.
c. two sperm nuclei and two egg nuclei.
d. one sperm nucleus and endosperm mother
cell nuclei.
e. two sperm nuclei and one endosperm
mother cell nucleus
D
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At 4:00 p.m. a closed flask of sterile broth is inoculated with 10,000 cells. The lag phase lasts 1 hour. At 9:00 p.m. the log phase culture has a population of 65 million cells. The mean generation time is approximately
A. 10 minutes. B. 40 minutes. C. 20 minutes. D. 30 minutes.
What stops the rapid depolarization that occurs as the "upsweep" of membrane potential peaks during the action potential?
A. Closing of the voltage-gated Na+ channel activation gate. B. Closing of the voltage-gated Na+ channel inactivation gate. C. Opening of the voltage-gated K+ channel gate. D. Both opening of the K+ channel gate and closing of the Na+ channel inactivation gate. E. Both opening of the K+ channel gate and closing of the Na+ channel activation gate.
Which of the following organisms is a prokaryote?
A) seaweed B) a slime mold C) an amoeba D) a bacterium
The conversion of amino acids to carbohydrates is an example of
A) amination. B) gluconeogenesis. C) substrate-level phosphorylation. D) beta-oxidation. E) electron transport.