In ecosystems, primary consumers are:
a. herbivores
b. carnivores
c. scavengers
d. decomposers
e. detritivores
a
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Why do plasmids make such excellent cloning vectors?
a. They are small and circular. b. They each have hundreds of restriction endonuclease cut sites. c. They replicate independently of the chromosomal DNA. d. They have uracil instead of thymine.
Which of the following is occurring because of
the warming trend we are currently in?
a. birds are laying eggs earlier b. plants are flowering earlier c. mammals are hibernating for shorter periods d. the rate of extinctions is increasing e. all of these are occurring
Most disinfectants work better in ________ solutions.
a) cold b) warm c) acidic d) organic
Microfilaments:
A) help cells move or capture prey. B) act as "monorails" along which organelles move. C) form the structure of cilia and flagella. D) stabilize the position of the nucleus.