What is the coefficient of relatedness for individuals A and B in the following pedigree?
a. 0.5 c. 0.125
b. 0.25 d. 0.0625
C
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Which of the following statements regarding Campylobacter infection is incorrect?
A. It can lead to Guillain-Barre syndrome. B. It can cause acute temporary paralysis. C. Campylobacter burrows into the mucosa of the ileum and multiplies. D. It can last over 2 weeks. E. It is caused by a shiga toxin.
In the Olestra experiment, the people who ate
the Olestra potato chips were the
a. experimental group. b. control group. c. research group. d. hypothetical group. e. independent group.
Connor decides to celebrate his 21st birthday by drinking a few beers at a local sports bar. After a while, Connor notices that he is making many more trips to the men's room than the week before, when he drank similar amounts of carbonated water. Why is that?
A. Alcohol stimulates the insertion of aquaporins into the plasma membranes of cells that line the collecting ducts, thereby decreasing water reabsorption. B. Alcohol inhibits the secretion of ADH by the posterior pituitary gland, thereby decreasing water reabsorption. C. Alcohol stimulates filtration of the blood plasma by the glomeruli. D. Alcohol inhibits reabsorption of sugars, amino acids and other small metabolites, which decreases reabsorption of water. E. Alcohol stimulates secretion of ions into the nephron and water follows by osmosis.
Mutations in the DFNA20/26 locus, which codes for the actin gamma 1 protein, are associated with congenital deafness. An irate senator complains that government money is being wasted on studies of this mutant gene-in yeast! "I am no biologist," says the senator, "but I am pretty sure yeast don't have ears." How do you respond?
A. "We can learn valuable information about the transcription of the mutant gene in yeast. It is much more difficult to study transcription in human cells." B. "We can learn valuable information about sound transmission through the mutant yeast. By placing a speaker against a yeast vial and recording sound from the other side, we can infer how the mutant actin affects sound waves." C. "We can learn valuable information about the structure of the mutant protein by expressing it in yeast. It is difficult to collect large amounts of actin from tiny hair cells, and unethical to collect it from human patients." D. "You are right, Senator -- yeast do not have ears. We should revoke the funding immediately."