Which of the following statements about the circadian clock is not correct?
A. A circadian clock is a set of molecular
mechanisms that cycle on their own and keep
a regular rhythm.
B. Physiological or behavioral aspects of an
animal are controlled by its biological clock.
C. Circadian clocks regulate daily rhythms
such as feeding, sleeping, hormone
production, and core body temperature
D. Circadian clocks are dependent on a set of
clock genes.
E. Circadian clocks are completely dependent
on the movement of the sun.
E
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Which of the following statements about "excitable membranes" is correct? (Select all correct choices.)
A. Cells spend a significant amount of energy to pump Na+ out of muscle cells at rest. B. The difference in charge across a plasma membrane is called a membrane potential. C. Acetylcholine released from a nerve cell binds to a ligand-gated ion channel at the plasma membrane of a muscle cell. D. An excitable membrane at rest has a high concentration of Cl- ions outside the cell, which flood into the cell upon the opening of an ion channel.
Explain why it takes energy to create starch from glucose, but it does not take energy to create glucose from starch. In your explanation, describe the law of thermodynamics that explains this, and describe how
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How can you establish that, in a newly described species of plant, a particular phenotype is due to a chloroplast rather than a nuclear gene?
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The concentrations of ions are very different inside and outside a nerve cell due to _____
A) osmosis B) diffusion C) sodium-potassium pumps D) symports and antiports