Cholesterol is a structural component of cell membranes. Amount of cholesterol present can affect membrane stability and permeability. What is the role of cholesterol in a membrane?
A. A membrane that needs to be more rigid and more permeable, would have high cholesterol ratios.
B. A membrane that needs to be rigid, such as a protective barrier, would have low cholesterol ratios.
C
Membranes with low amounts of cholesterol are very stable and have increased permeability.
D. Membranes with high amounts of cholesterol are very stable and have decreased permeability.
D
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What will be an ideal response?
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A. by the nerve releasing a neurotransmitter, which triggers a flow of calcium that releases ATP and begins the actin filaments sliding across the myosin binding sites. B. by release of a neurotransmitter at a synapse that directly causes actin and myosin to slide. C. by the nerve releasing a neurotransmitter, which triggers a flow of calcium that attaches to actin filaments and exposes the myosin binding sites. D. when high levels of oxygen and sugar are released by the sarcolemma. E. when a surplus of ATP is released by a nerve motor unit.
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A) in the oviduct (fallopian tube) B) in the placenta C) in the uterus D) in the ovary
How long does it take for the daughter cells to initiate or start the next round of replication?
What would be an ideal response?