When can genetic drift occur? A
It can occur in small populations when alleles increase or decrease by chance over time.
B
It can occur in large populations when alleles increase or decrease by chance over time.
C
It can occur in large populations when alleles increase or decrease as a result of natural selection over time.
D
It can occur in small populations when alleles increase or decrease as a result of natural selection over time.

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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).

This connective tissue consists of large round densely packed cells with the nucleus pushed to one side.