Which of the following statements about the loop of Henle is true?
a. The walls of the descending loop are relatively impermeable to water.
b. The walls of the descending loop are relatively permeable to sodium.
c. The walls of the ascending loop are relatively permeable to water.
d. The walls of the ascending loop are relatively permeable to sodium.
e. The entire loops is relatively permeable to sodium.
d
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Cystic fibrosis is a recessive disorder. If a
couple, each of whom is heterozygous, have children, what is the probability that they will have a child with cystic fibrosis?
a. 0% b. 25% c. 50% d. 75% e. 100%
When a farmer grows cotton containing the gene for Bt toxin, insects that are resistant (rr) survive and reproduce. These insects were resistant because Select one:
a. the insects were able to produce gametes that were resistant to the insecticide. b. the insects wanted to survive the insecticide and mutated their DNA. c. by random chance some insects did not die from the insecticide. d. the insecticide caused mutations to generate resistant alleles. e. they inherited the alleles that made them resistant.
Action potentials are typically also characterized as graded potentials.
Answer the following statement true (T) or false (F)
Mutations can affect hormone receptors in the following ways, except for which statement?
A. Result in missing or defective receptors B. Alter the rate of production of receptors C. Affect the response to a hormone D. Decrease the level of hormones in their vicinity E. Alter the binding site of receptors