Optical tweezers can be used to ________.
A. study nucleic acids recovered from individual cells
B. help dissect individual microorganisms
C. remove structures from the surface of cells
D. All of the choices are correct.
Answer: A
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Eukaryotic cells acquired mitochondria and chloroplasts by
A. endosymbiosis. B. exocytosis. C. pinocytosis. D. mutation. E. natural selection.
What is the correct order for the following events that follow a nerve impulse along a sympathetic neuron to innervate
the heart? 1) G protein activates adenylyl cyclase 2) Neuron releases norepinephrine 3) Cyclic AMP activates protein kinase 4) Receptor activates G protein 5) Protein kinase phosphorylates Ca2+ channels 6) Receptors activated on the membrane of the cardiac muscle a. 1, 3, 4, 5, 2, 6 b. 5, 3, 4, 1, 2, 6 c. 6, 2, 4, 1, 3, 5 d. 2, 6, 4, 1, 3, 5
e. 2, 3, 4, 1, 6, 5Knowledge of the cell cycle has led to improved means of treating cancer. The drug 5-fluorouracil blocks the synthesis of thymine. This drugs inhibits the cell cycle at the end of
a. G1. b. G2. c. S. d. prophase. e. metaphase.
Treating infections with gram-positive bacteria requires different drugs than those used to treat gram-negative bacteria.
a. true b. false