15. Sarah is a biologist who is studying a species of crab. In the wild, crabs with larger
pincers will have greater reproductive success than those with smaller pincers. To
investigate this further, she placed 50 crabs with small pincers and 50 crabs with large
pincers together in an isolated area that closely resembled their natural environment.
She observed several generations of the crabs over the next ten years. If her
experimental setup replicates the natural selection process in the wild, which result is
most likely to be observed?
A. the crabs born with small claws would develop larger claws and pass this trait to their offspring
B. The percentage of crab as with large claws would increase.
C. The percentage of crabs with small claws would increase.
D. the DNA in crabs with small claws would mutate in order to produce larger claws.
Answers: 2
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Choose the incorrect statement (a) the motor end plate membrane is only capable of generating graded potentials, but it is contiguous with the skeletal muscle sarcolemma, which can generate action potentials. (b) propagation of an action potential through the t-tubules into the sarcoplasmic reticulum triggers the release of ca++ into the cytoplasm of a skeletal muscle fiber. (c) the generation of suprathreshold endplate potentials in multiple muscle fibers could be due to the increased frequency of action potential generation at the axon hillock of a single motor neuron. (d) a greater amount of ach would be found in the presynaptic vesicles of a motor unit that fired several action potentials after exposure to botulinum toxin, than in a motor unit that fired several action potentials after exposure to the venom of the krait snake (which contains α-bungarotoxin).
Answers: 2
15. Sarah is a biologist who is studying a species of crab. In the wild, crabs with larger
pincers...
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