The role of a control in an experiment is to
A) provide a basis of comparison to the experimental group.
B) prove that a hypothesis is correct.
C) ensure repeatability.
Answer: A
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In general, repressor proteins that act to inhibit eukaryotic gene expression:
A. interfere with communication between Pol II and DNA-binding transactivators. B. block Pol II-mediated polymerization of ribonucleotides. C. bind to the C-terminal domain of Pol II. D. disrupt HMG protein-DNA interactions.
Which of the following vertebral curvatures is convex anteriorly?
A) cervical B) sacral C) thoracic D) lumbar E) both cervical and lumbar
Newborn humans face thermoregulatory challenges as do small mammals. One mechanism they use to generate heat is
A. shivering thermogenesis in "brown fat." B. nonshivering thermogenesis in "brown fat." C. convection in "brown fat." D. evaporation in "brown fat." E. radiation in "brown fat."
If a gene for a trait is monomorphic in a population and two random individuals mate, what would be the most likely phenotypic ratio for that trait in the offspring?
A) 2:1 B) 1 C) 3:1 D) More information is needed