In a muscle contraction event, ____ causes the release of calcium from the sarcoplasmic reticulum
a. the hydrolysis of ATP
b. the formation of ATP
c. the formation of the actin-myosin cross-bridge
d. a signal from a motor neuron
e. the shortening of the sarcomere
ANSWER: d
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In a neuron at rest, which of the following is TRUE?
A. Leakage of sodium ions out of the neuron is greater than leakage of potassium ions into the neuron. B. Leakage of sodium ions into the neuron is greater than leakage of potassium ions out of the neuron. C. Leakage of potassium ions out of the neuron is greater than leakage of sodium ions into the neuron. D. Leakage of potassium ions into the neuron is greater than leakage of sodium ions out of the neuron. E. Leakage of potassium ions out of the neuron is equivalent to leakage of sodium ions into the neuron.
The concept of an ecosystem differs from that
of a community in that, unlike the community, the ecosystem includes the a. producers. b. decomposers. c. physical environmental factors. d. animals as well as the plants. e. parasites.
What are lysosomes, and how do they work in the cell?
What will be an ideal response?
A(n) (oxidation/reduction/transport) reaction is one in which a molecule accepts an electron.
Fill in the blank(s) with the appropriate word(s).