DNA replication is a semi-conservative process. This means that after replication, ________.
A. each new DNA double helix consists of two old strands
B. each new DNA double helix consists of two new strands
C. each new DNA double helix contains 25% of the old DNA double helix
D. each new DNA double helix consists of one old strand and one new strand
Answer: D
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In noncompetitive feedback inhibition
a. the products of the reaction block the active site of the enzyme. b. the products of the reaction at the end of the pathway bind to a site other than the active site of an enzyme at or near the beginning of the pathway and block enzyme activity indirectly. c. the substrate and cofactors compete for the active site. d. the inhibitor binds to and directly blocks the active site of the enzyme. e. enzyme activity is controlled by the reversible binding of a regulatory molecule.
The letter “C” in the above figure represents
a. transverse. b. radial. c. tangential. d. elliptical. e. obtuse.
The response represented by the dashed line in the accompanying figure indicates a:
a. secondary response to the initial antigen. b. primary response to the initial antigen. c. secondary response to an antigen distinctly different from the initial antigen. d. primary response to an antigen distinctly different from the initial antigen. e. secondary response equivalent to a primary response
On the basis of this figure, multicellularity in plants and opisthokonts:
a. has the same evolutionary origin. b. is independently derived in each lineage. c. is fixed within the each lineage (all organisms are multicellular). d. originated in the amoebozoa.