How do cells in the body of a multicellular organism communicate with each other?
a. by way of signaling molecules that interact with specific receptors
b. through long projections that directly connect cells to each other
c. through electrical signals passed between a cell and its external environment
d. by the transport of ions between cells in different parts of the organism
e. by the transport of ions in water
ANSWER: a
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X-ray crystallography was used to determine the structure of:
A. cholesterol. B. vitamin B12. C. myoglobin. D. insulin. E. All of these choices are correct.
Which of the following traits appeared at point 3 on the phylogeny above?
A. gap junctions B. cell signaling C. adhesion D. bulk transport E. differentiation of distinct cell types
Why is it advantageous for transcription factors to be multimeric and for their binding sites to be clustered?
A) The strength of the DNA-protein interactions is increased. B) The DNA sequence specificity of each DNA-protein interaction is increased. C) Each DNA-protein complex is better able to bind to RNA polymerase. D) Competition for binding between different transcription factors for the same regulatory region is decreased.
Which of the following is NOT related to
Cushing’s syndrome?
a. blood pressure and blood glucose levels are abnormally high b. cortisol levels are low c. bone density decreases d. the usual cause is prednisone and cortisone shots e. all of these are related to Cushing’s syndrome