Which of the following is NOT true of enzyme behavior?
a. Enzyme shape may change during catalysis.
b. Enzymes cannot make something happen that would not happen on its own.
c. All enzymes have an active site where substrates are temporarily bound.
d. Each enzyme can catalyze a wide variety of different reactions.
e. Enzymes speed up reactions.
ANSWER: d
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An embryo develops rudiments of all organs by week ________ of prenatal development.
A) 8 B) 4 C) 6 D) 3
The proteome represents _____, while the cellular proteome represents _____
a. all of the proteins able to be made by all living organisms; the proteins made by unicellular organisms b. the set of proteins made by any multicellular organism; the set of proteins made by unicellular organisms c. all of the proteins able to be expressed by an organism’s genome; the subset of proteins found in a particular cell type d. all of the proteins that are common to all living organisms; the proteins found in the same cell types of different species e. the subject of proteomics research; the subject of phenomics research
During transcription, which strand of a DNA molecule is copied into mRNA?
a. the non-template strand b. both strands of the DNA c. the strand that has the same polarity as the mRNA d. the template strand
The peptidoglycan of bacterial cell walls contains a carbohydrate matrix linked together by short chains of
A. amino acids. B. nucleotides. C. fatty acids. D. steroids. E. water molecules.