Which part of the seed is responsible for providing nutrition to the embryo?
A. Integument
B. Endosperm
C. Cotelydons
D. Seed coat
E. Procambium
B. Endosperm
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A bacterial artificial chromosome (BAC) is different from a plasmid vector because it:
A. lacks an origin for replication in bacteria. B. accommodates much larger fragments (100–300kb). C. has a higher copy number than the plasmid vector. D. has only selectable markers with which to detect its presence in cells. E. lacks par genes that the plasmid has to maintain its high copy number.
Explain how the trp operon is regulated in a prokaryotic cell when tryptophan is present.
What will be an ideal response?
Evolution on a large scale, or ____ involves speciation, or the splitting of one species into two or more species.
Fill in the blank(s) with the appropriate word(s)
A major source of variation in populations of organisms is:
a. differential reproductive success. b. mutation. c. norms of reaction. d. All of the above. e. None of the above.