Why is cell communication considered evolutionarily ancient?
What will be an ideal response?
ANSWER: Some protein components of cell communication pathways are the same in prokaryotes and
eukaryotes. Some entire cell signaling pathways are conserved between distantly related
organisms, for example, Drosophila and humans.
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Consider the Calvin-Benson cycle and the noncyclic photosynthetic pathway. Why is the cyclic
pathway so important? What will be an ideal response?
What is the value of having transgenic mice with the human gene for Huntington's disease (HD)?
A. The mice can be sacrificed and their brains examined to learn about the early stages of the disease. B. The mice can be used to screen possible anti-HD drugs. C. The mice are much more numerous and available for study than human patients. D. The mice can be used to screen possible anti-HD drugs and are much more numerous and available for study than human patients. E. All of these.
Saturated fatty acids store more energy than unsaturated fatty acids. Based on your knowledge of aerobic respiration,
you draw this conclusion because saturated fatty acids:a. lack phosphate. b. are deaminated. c. contain more ATP. d. are more highly reduced. e. contain more ester linkages.
Sulfonamides work by
A) Inhibiting folic acid synthesis B) Inhibiting cell wall synthesis C) Inhibiting nucleic acid synthesis D) Lysing plasma membranes