The malleus and incus function to
A) channel sounds in the inner ear.
B) amplify sound.
C) convert a sound wave into an electrical impulse.
D) convert a long wave light into an electrical impulse.
E) sense static position.
B
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If an individual carries a mutation that results in a complete lack of MHC class I proteins, how would the individual's immune response be affected? Select all correct choices
A. Memory cell antibodies would not be able to attach to antigen epitopes. B. Cytotoxic T cells would not be able to target (and destroy) infected cells. C. Helper T cells would not be able to interact with antigen-presenting cells. D. Plasma cell antibodies would not be able to attach to antigen epitopes.
Generally the proteins of thermophiles
A. resist denaturation. B. react more efficiently with DNA. C. are easily denatured. D. have a particular amino acid sequence that restricts bond formation. E. are easily denatured AND have a particular amino acid sequence that restricts bond formation.
Four of the five answers listed below are true of a neuron at resting potential. Select the exception
a. The interior of a neuron is positive. b. The interior of a neuron has a negative charge. c. There are more sodium ions outside a neuron. d. There are more potassium ions inside a neuron. e. The membrane of a neuron is polarized.
Which of the following terms best characterizes catabolite repression associated with the lac operon in E. coli?
A) negative control B) constitutive C) repressible system D) positive control E) inducible system