Which of the following statements about the nitrogen cycle is true?
A) The nitrogen cycle requires different types of bacteria.
B) Nitrogen gas is converted to nitrates in plant leaves.
C) Nitrogen cannot be cycled through living organisms.
D) When plants and animals die, nitrogen is removed from the nitrogen cycle
Ans: A) The nitrogen cycle requires different types of bacteria.
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Which of the following evolution-related events is in the correct cause-and-effect sequence?
a. mutation ? variation ? natural selection ? adaptation ? speciation b. variation ? adaptation ? mutation ? natural selection ? speciation c. speciation ? adaptation ? variation ? mutation ? natural selection d. mutation ? speciation ? adaptation ? variation ? natural selection e. natural selection ? variation ? mutation ? adaptation ? speciation
If the complete genetic information of a person
is isolated from some of her cells, cut with restriction enzymes, inserted into a cloning vector, and introduced within bacteria for cloning purposes, what would the set of clones be called containing all the genes of that person?
a. a genetic library b. a genomic library c. a gene library d. a DNA library e. a nucleotide library
Further evolution of the protostomes changed the coelom by
a. losing it. b. reducing it. c. it becoming a pseudocoel. d. all of the above.
If a water molecule passes through the outer membrane of a chloroplast, how many more membranes will it have to move through to be in the stroma?
A. one B. three C. two D. four