Which of these is the most common compound in the cell walls of gram-positive bacteria?
a. cellulose
b. peptidoglycan
c. lipopolysaccharide
d. lignin
e. proteinoid
Ans: b. peptidoglycan
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When was the human genome officially sequenced?
a. 1975 b. 2003 c. 1989 d. 1953 e. 2001
What did Richard Axel and Linda Buck discover about the way in which we are able to perceive many different types of odors?
A. Vertebrate animals make a large number of distinct types of receptor proteins, each of which binds a particular odorant molecule or small group of such molecules. B. Odors are distinguished by the way in which they bind both olfactory and taste receptors-it is the overall "picture" generated this way that we perceive. C. Many different types of odors bind to just a few different types of receptor molecules. D. None of the answers are correct.
When a person is exercising, CO2 builds up in the blood. What effect would this have on external respiration?
A) There would be increased diffusion of CO2 out of the blood and into the lungs and increased ventilation to move it out of the body. B) There would be decreased diffusion of CO2 out of the blood and into the lungs and increased ventilation to move it out of the body. C) There would be increased diffusion of CO2 out of the blood and into the lungs and decreased ventilation to move it out of the body. D) There would be decreased diffusion of CO2 out of the blood and into the lungs and decreased ventilation to move it out of the body.
In eukaryotes, photosynthesis takes place inside the ________.
A. cytoplasm B. chloroplasts C. mitochondria D. Golgi apparatus