One of the following drugs blocks cell division because it stabilizes the microtubules. What is this drug, and for what is it used?
A) vincristine; bacterial infections
B) vinblastine; antimitotic therapy
C) taxol; breast cancer
D) nocodazole; allergies
E) benzimidazole; colchicine
C) taxol; breast cancer
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What is the source of energy for the synthesis of organic molecules in a photoautotroph?
A. carbon dioxide B. inorganic compounds C. other organic compounds D. light E. heat
The main reason scientists thought that proteins, rather than DNA, were the carriers of genetic material
in the cell was:a. their presence within the nucleus. b. their abundance within the cell. c. the large number of possible amino acid combinations. d. their ability to self replicate within the cytoplasm. e. their ability to be exported from the cell.
Although glucose molecules constantly diffuse into a red blood cell along their concentration gradient, equilibrium is never reached and a steep concentration gradient is continually maintained. What causes this?
a. The active transport of glucose b. The very fast turnover rate of glucose metabolism c. The ability of the cell to engulf glucose by pinocytosis d. The continuous excretion of glucose from other parts of the cell e. The rapid and continuous addition of phosphates onto the glucose molecules
The sinoatrial node consists of a form of this tissue.
A. nervous B. adipose C. muscular D. connective E. epithelial