M
from "deborah's experiment: counting bacteria in beef"
which of the following best presents the results for brand a?
mples of
ach sample.
cound beef.
the refrigerated samples of brand a contained more bacterial
colonies than the frozen samples of brand a.
b.
the refrigerated samples of brand a contained a total of 287 bacterial
colonies. the frozen samples of brand a contained a total of 228
bacterial colonies.
the average number of bacterial colonies in the refrigerated samples
of brand a was 94. the average number of bacterial colonies in the
frozen samples of brand a was 76.
d.
the bacteria in both the refrigerated and frozen samples of brand a
showed an increase in reproduction, then a decrease in reproduction.

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).