____ is NOT a product of the Kreb cycle.
A. Pyruvic acid
B. ATP
C. NADH2 and FADH2
D. CO2
A. Pyruvic acid
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A cage containing male mosquitoes has a small earphone placed on top, through which the sound of a female mosquito is played. All the males immediately fly to the earphone and go through all of the steps of copulation
What is the best explanation for this behavior? A) The males learn to associate the sound with females. B) Copulation is a fixed action pattern, and the female flight sound is a sign stimulus that initiates it. C) The sound from the earphone irritates the male mosquitoes, causing them to attempt to sting it. D) The reproductive drive is so strong that when males are deprived of females, they will attempt to mate with anything that has even the slightest female characteristic. E) Through classical conditioning, the male mosquitoes have associated the inappropriate stimulus from the earphone with the normal response of copulation.
Double fertilization produces a triploid tissue from
the union of a. one sperm nucleus and one female nucleus. b. two sperm nuclei and one female nucleus. c. one sperm nucleus and two female nuclei. d. two sperm nuclei and two female nuclei. e. one sperm nucleus and three female nuclei.
If herbivores eat 1000 kcal of plant energy, approximately how much energy will be converted into the tissues of herbivores?
A) 1 kcal B) 10 kcal C) 100 kcal D) 1000 kcal
Microdomains in eukaryotic plasma membranes can participate in ________.
A. signal transduction B. cell movement C. cell division D. All of the choices are correct.