Cells must constantly bring in certain molecules and ions while keeping others out. What part of the cell accomplishes this function?
a. the vesicles
b. the plasma membrane
c. the nucleus
d. the lysosomes
Ans: b. the plasma membrane
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What would happen to protons that reenter the mitochondrial matrix?
a. They are attached to NAD+ and FAD. b. They combine with oxygen to form water. c. They synthesize ATP by substrate-level phosphorylation. d. They help in the production of CO2. e. They regenerate Coenzyme A.
There is a single gene that controls the ability to taste PTC paper. The ability to taste is dominant to the inability to taste. If you can taste the paper, it is very bitter. Which of the following genotypes can taste the paper?
A. only Pp B. both PP and Pp C. only pp D. both PP and pp E. only PP
Which of the following statements does not describe the leaf epidermis?
a. The cells all contain chloroplasts and photosynthesize. b. Some of the cells are modified to form trichomes. c. The cells are covered by a waxy cuticle. d. The cells are relatively transparent. e. It contains stomata, each of which is flanked by two guard cells.
In aerobic respiration, how many molecules of acetic acid are produced from six molecules of glucose?
A) 1 B) 38 C) 6 D) 12