Microbes growing in boiling hot mineral springs are generally:
a. methanogens
b. halophiles
c. hyperthermophiles
d. purple sulfur bacteria
e. cyanobacteria
Ans: c. hyperthermophiles
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Which statement best describes the mechanism(s) of posttranslational regulation of gene expression?
A. Covalent modification of newly synthesized proteins generally has no marked effect on protein function. B. Protein synthesis is often repressed by feedback or noncompetitive inhibition. C. Allosteric regulation following transcription of mRNA occurs in many biosynthetic pathways. D. Once a protein is synthesized, there is little to no posttranslational modification.
A dihybrid cross of linked genes theoretically gives a phenotypic ratio of
A. 1:1. B. 9:3:3:1. C. 3:1. D. 1:1:1:1. E. 2:1.
Tendon sheaths are used to
a. reduce friction. b. protect joints. c. protect muscles. d. attach tendons to each other. e. stabilize joints.
Septic shock is typically associated with
A) superantigens. B) exotoxins. C) exotoxins or endotoxin. D) either Gram-negative or Gram-positive infections. E) Gram-negative infections.