Explain how the cells produced by meiosis can have undergone two nuclear divisions but have a
haploid number of chromosomes. What will be an ideal response?
Concepts to Consider: This is possible because the first nuclear division is preceded by duplication of
the chromosomes, whereas the second nuclear division is not. As a result, the ploidy of the cells after
two divisions is exactly half that of the parental cell
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It is believed that the coelacanths and lungfish represent a crucial link between other fishes and tetrapods. What is the major feature in these fish in support of this hypothesis?
A) Like amphibians, they are tied to the water for reproduction. B) Their fins have skeletal and muscular structures similar to amphibian limbs. C) They have highly evolved nervous and circulatory systems. D) They have lungs and are able to breathe air when water is scarce. E) They enter a hibernative stage when food is scarce, as many tetrapods do.
Provide a reason for the ecological importance of pelagic Bacteria and Archaea
What will be an ideal response?
Modern oceanography and marine biology were attributed to:
a. the voyage of the Beagle. b. the discoveries of Alvin. c. the laying of the transatlantic telegraph cable. d. expeditions of Alexander Agassiz. e. the Challenger expedition.
Neurotransmitters like acetylcholine
A. are released from axons. B. travel from dendrite to axon. C. are released from dendrites. D. travel from the soma to the dendrites.