What molecule contributes to the red color of slow-twitch muscle fibers?
A. myoglobin
B. ATP
C. glycogen
D. lactic acid
E. fatty acids
A. myoglobin
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The macromolecule containing alternating N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM) chains cross-linked by short peptide fragments is ________.
A. teichoic acid B. mycolic acid C. lysozyme D. lipopolysaccharide E. peptidoglycan
An interaction between two species in which
both species benefit is a. mutualism. b. parasitism. c. commensalism. d. competition. e. predation.
A mutation can be the cause for
A) sperm and egg formation. B) growth and development. C) sexual reproduction. D) environmental change. E) natural selection.
The role of a metabolite that controls a repressible operon is to
A) bind to the promoter region and decrease the affinity of RNA polymerase for the promoter. B) bind to the operator region and block the attachment of RNA polymerase to the promoter. C) increase the production of inactive repressor proteins. D) bind to the repressor protein and inactivate it. E) bind to the repressor protein and activate it.