Four of these factors play a role in phylogeny. Which one does not?
a. number of digits
b. DNA sequence for a gene
c. amino acid sequence of an enzyme
d. number of petals
e. number of individuals
ANSWER: e
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Discuss the ecological importance of the enzyme nitrogenase, the diversity and physiology of the various groups of organisms that contain it, and the strategies these organisms use to optimize conditions for the enzyme
What will be an ideal response?
Descriptions of the distal convoluted tubule
a. lined with cuboidal epithelium b. epithelial cells have many mitochondria c. connects to the collecting duct d. all of the above
Knoblike sacs where the inner colon lining protrudes through the intestinal wall are called
a. diverticula. b. ulcers. c. haustra d. sphincters. e. appendices.
Each of the following statements about action potentials is true except
A) action potentials are propagated along a dendrite. B) action potentials require rapid changes in membrane potential. C) due to ion leaking, membranes may undergo subthreshold depolarization, which is insufficient to produce an action potential. D) action potentials end with a transient hyperpolarization. E) the action potential cycle has a refractory period.