Which is NOT true about cofactors involved in enzymatic reactions?
A. They may alter the conformation of the enzyme.
B. Only a small number of cofactor molecules may be needed to maintain enzyme activity.
C. They may be a metal such as iron.
D. There must be equal quantities of enzyme and cofactor molecules for a reaction to proceed.
E. They may be a substrate in a catalyzed reaction.
Answer: D
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Which statement regarding the half-life of hormones is false?
A. Protein hormones have short half-lives. B. Steroid hormones and thyroid hormones have unstable levels within the body. C. Epinephrine and protein hormones are quickly degraded, recycled, or excreted from the body. D. Steroid hormones and thyroid hormones have their half-lives extended by binding to plasma proteins.
Innate defenses are
A. slow and nonspecific. B. fast and nonspecific. C. fast and specific. D. slow and specific.
What vitamin is synthesized by the skin? Explain why this vitamin is critical for various physiological processes
What will be an ideal response?
Which is a function of the tissue shown in diagram A?a) heat production b) pumping of blood c) propulsion of food d) contraction of bladder e) conduct nerve impulses to muscle fibers Answer: a
a) heat production b) pumping of blood c) propulsion of food d) contraction of bladder e) conduct nerve impulses to muscle fibers