Which of the following is not true about enzymes?
A. Enzymes have high-energy bonds between phosphates.
B. Enzymes can be denaturated by heat and other agents.
C. Enzymes participate in the cell's chemical reactions.
D. Enzymes are found in all cells.
E. Enzymes are catalysts.
Answer: A
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Molecules
A. are derived from the ionic bonding of two or more atoms. B. have the same physical properties as the atoms from which they were derived. C. are not important in biological processes. D. can form from the covalent bonding of two or more atoms. E. cannot have a charge.
Bacteria use restriction enzymes to
a. integrate viral DNA. b. destroy viral DNA. c. prevent mutation of their DNA. d. copy their genes. e. inhibit the expression of some of their genes.
Your father's mother was a heterozygous carrier of a X-linked trait. If you are a male, what are the chances of you inheriting this X-linked trait by direct descent from your paternal grandmother?
a) 25% b) 0% c) 12.5% d) 33% e) 50%
Where do the light reactions of photosynthesis occur?
A) stroma B) outer chloroplast membrane C) thylakoids D) rubisco