Suppose that a man and woman have a son with a rare genetic disorder known to be X-linked. There is no occurrence of the disorder on the woman's side of the family, but the man's brother has it, as does her father. What is the probability that the son's defective allele came from the man?
a. 0%
b. 25%
c. 50%
d. 100%
Answer: a. 0%
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Cholesterol is a structural component of cell membranes. Amount of cholesterol present can affect membrane stability and permeability. What is the role of cholesterol in a membrane? A. A membrane that needs to be more rigid and more permeable, would have high cholesterol ratios. B. A membrane that needs to be rigid, such as a protective barrier, would have low cholesterol ratios. C
Membranes with low amounts of cholesterol are very stable and have increased permeability. D. Membranes with high amounts of cholesterol are very stable and have decreased permeability.
A traveler returning to the United.States from India reported having a fever and severe joint pain. She mentioned that the mosquitoes had been particularly troublesome during her trip, and that she had taken the appropriate prophylactic anti-malarial medications. What is a likely cause of her illness?
A. Chickungunya fever B. West Nile virus C. Malaria D. Yellow fever E. Lyme disease
Crop plants with added insect resistance might lead to
a. toxicity in humans. b. development of more resistant insects. c. toxicity in land animals. d. toxicity in birds. e. toxicity in fish
Conjugation, transduction, and transformation all occur in nature
Which do you expect would more likely account for the acquisition of the genes for resistance to an antibiotic? Why? Which do you think would best account for the acquisition of genes from one bacterial species by another of a different genus? Why?