Feedback inhibition prevents cells from
A) the harmful effects of enzyme activation by covalent modification of unneeded enzymes.
B) making products that are not needed by inhibiting the activity of enzymes in biosynthetic pathways allosterically.
C) destroying enzymes by proteolytic cleavage when they are needed in biosynthetic pathways.
D) accumulating unnecessary proteins.
E) irreversibly inhibiting critical enzymes.
Answer: B
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a. develops about 5 days after fertilization. b. still surrounded by the zona pellucida. c. comprised of blastomeres reorganized around the blastocyst cavity. d. still about the size of the original zygote. e. organized as embryoblast and trophoblast.
Triglycerides are composed of three fatty acids attached to a molecule of ________.
Fill in the blank(s) with the appropriate word(s).
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