Light microscopes
A) typically provide more resolution than an electron microscope.
B) work by reflecting electrons off the surface of an object being studied.
C) use light and glass lenses to magnify an image.
D) are generally not used to view bacteria.
Answer: C
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If an organism's chromosomal DNA is like an instruction manual, what instructions do cells receive from genes?
A) continue growing until the cell can reproduce B) convert carbohydrates into enzymes C) make specific proteins from amino acids D) modify the cell shape for a changing environment
Each of the following is a way cancer cells avoid growth and invasion restriction imposed by the immune system except
A) They produce a heterogeneous group of cells. B) They respond to density-dependent growth factors. C) They produce molecules that inhibit T lymphocyte function. D) They surround themselves with dense supporting tissue. E) They express low levels of surface antigens.
Sessile organisms are not animals. True or false?
a. True. An organism must move to be classified as an animal. b. True. Sessile organisms are generally organisms without appendages and, therefore, are not true animals. c. False. Sessile organisms may not move as adults, but they may exhibit movement as larvae. d. False. There is no requirement for movement in defining an organism as an animal. e. Neither true nor false. Organisms are not sessile; individual cells are.
Which kind of metabolic poison would interfere with the glycolysis stage of cellular respiration?
A) An agent that reacts with FADH2 and oxidizes FAD+ B) An agent that closely mimics the structure of glucose but is not capable of being metabolized and broken down C) An agent that binds to lactate and inactivates it D) An agent that reacts with oxygen and depletes its concentration in the cell E) An agent that inhibits the formation of acetyl CoA