What organelle modifies new polypeptides and sorts proteins and lipids?
a. nucleus
b. mitochondria
c. peroxisomes
d. lysosomes
e. Golgi body
ANSWER: e
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The atomic number of an atom is
A. the number of protons in the atom. B. the number of neutrons in the atom. C. the number of protons and electrons in the atom. D. the number of protons and neutrons in the atom. E. None of these choices are correct.
Why do environmentalists ask inhabitants of waterfront properties to reduce their use of plant
fertilizers?
a. The fertilizers may be toxic to microbes. b. The fertilizers may encourage soil erosion. c. The plants may start using more water. d. The runoff from plants may bring about an algal bloom.
Which external structure protects bacteria from phagocytosis?
A. Slime layer B. Capsule C. Fimbriae D. Cell membrane
A cell cycle checkpoint at which phase would ensure sufficient nutrients for cell division were available?
a. S b. prophase c. metaphase d. G1 or G2 e. G1 or S