The innermost portion of a virus's structure is made up of
A. a membranous envelope.
B. either DNA or RNA.
C. both DNA and RNA.
D. microtubules.
E. a protein capsid.
Answer: B
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MacConkey agar and eosin-methylene blue (EMB) agar are ________ media
A) selective but not differential B) differential but not selective C) both selective and differential D) neither selective nor differential
The endocrine system functions in
a. conduction. b. contraction. c. hormonal control of the body. d. protection against disease. e. cell production.
When a biologist is looking for a suitable organism in which she can study the process of evolution in a laboratory setting, what would be an important consideration?
A) The organism should be large. B) The organism should have a short generation time. C) The organism should produce relatively few offspring. D) The organism should have a complete fossil record of its ancestry.
What is the key difference between photoheterotrophs and photoautotrophs?
a. Photoautotrophs only use bacteriochlorophyll; photoheterotrophs only use chlorophyll a. b. Photoheterotrophs produce oxygen as a by-product; photoautotrophs do not. c. Photoheterotrophs use hydrogen sulfide for reducing power; photoautotrophs do not. d. Photoheterotrophs use organic compounds as their carbon source; photoautotrophs use carbon dioxide as their carbon source.