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

Biology & Microbiology

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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

Biology & Microbiology

An interaction between two species in which

both species benefit is a. mutualism. b. parasitism. c. commensalism. d. competition. e. predation.

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology