The major function of a receptor is to
a. control the autonomic functions of the body.
b. stabilize the internal environment to achieve
homeostasis.
c. produce responses to the various stimuli the
body receives.
d. give organisms or cells awareness of and
sensitivity to their environment.
e. do none of these.
Answer: d
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The Kd for a protein-ligand interaction is:
A. the rate at which the protein binds ligand. B. the square root of the equilibrium constant. C. the fraction of ligand-binding sites occupied at equilibrium. D. the ligand concentration at which half of the available ligand-binding sites are occupied. E. None of these choices is correct.
Which are main colors of light absorbed by rod
cells?
a. red, green, blue b. blue, yellow, red c. yellow, orange, brown d. green, blue, white e. none of these colors of light are absorbed by rod cells
The offspring of two heterozygous gray-bodied, normal-winged flies should be 50% graybodied/
normal wings (BbRr) and 50% black-bodied/vestigial wings (bbrr) because these alleles are linked. If a small number, say 15%, of the offspring are instead black-bodied with normal wings, this is most likely the result of: a. crossing-over. b. incomplete dominance. c. codominance. d. an error in meiosis. e. mutation.
____ is NOT an event of telophase.
A. Uncoiling of chromosomes B. Disappearance of spindles C. Nuclear membranes forming to create daughter nuclei D. Breaking down of nucleoli