Sodium-potassium pump:
a. reestablishes the gradient of sodium and potassium
b. releases neurotransmitters
c. pumps sodium into the cell and potassium out of the cell
d. transmits the action potential
Ans: a. reestablishes the gradient of sodium and potassium
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A patient in his forties is diagnosed with Huntington disease. The patient's mother is healthy and a genetic evaluation shows 25 and 26 CAG repeats within her HTT alleles
The patient's father died at age 24 when the patient was 2 and no genetic evaluation can be done. It is most likely that: A. the father was heterozygous for the defective HTT allele. B. the father was homozygous for the defective HTT allele. C. the mother is a carrier for the defective HTT allele. D. the HTT gene acquired additional CAG repeats during the 40 years of the patient's life.
Enzymes ____
a. control the speed of a reaction b. change shapes to facilitate certain reactions. c. may place physical stress on the bonds of the substrate. d. always work on their own. e. lower activation energy.
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
Methanogens may contribute to the greenhouse effect and global warming due to methane production.
Answer the following statement true (T) or false (F)