The diploid number of a roundworm species is 4. Assuming there is no crossover, and random segregation of homologues during meiosis, how many different possible combinations of chromosomes might there be in the offspring (not including variety
generated by crossing over)? A) 4
B) 8
C) 16
D) 64
C
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Which of the following occurs to transmit signals from one neuron to another?
a. Electrical signals cross the synapse. b. An action potential jumps the synapse. c. ATP starts an action potential in the postsynaptic cell. d. The presynaptic cell releases a neurotransmitter
An Arctic community affects the tundra ecosystem by
A. the amount of waste it produces. B. the amount of oxygen it uses. C. All answers are correct. D. the amount of sunlight it captures for photosynthesis. E. the amount of habitat space it requires.
The respiratory systems of fishes, frogs, sponges, and earthworms are similar in that they
A) exchange gases across a moist respiratory surface. B) have internal respiratory structures. C) utilize a complex network of air-conducting tubes. D) employ an extensive system of air sacs that ensures a unidirectional flow of air. E) have a countercurrent exchange system.
All of the following are part of a plant's shoot system EXCEPT
A) flowers. B) mycorrhizae. C) leaves. D) buds. E) stem.