Mutations of the gene for ?-globin
a. are usually lethal.
b. occur only at amino acid position 6.
c. number in the hundreds.
d. always result in sickling of red blood cells.
e. can always be detected by gel electrophoresis.
Answer: c. number in the hundreds.
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Over the past several decades, populations of Staphylococcus aureus (a type of bacteria that infects wounds) have become resistant to penicillin
You run the following experiment: Reference: Ref 14-1 In a different set of experiments, you identify two kinds of mutations in S. aureus. The first type of mutation makes the bacteria more susceptible to antibiotic X; the second type of mutation makes it more resistant to antibiotic X. Which type of mutation is more likely to occur in the population? A. the first type (more susceptible) B. the second type (more resistant) C. It depends if the cell population has been exposed to antibiotic X. D. It depends if either type of mutation confers additional survival benefits to S. aureus. E. There is no difference in likelihood because the mutation is a random event.
Aerobic respiration consumes gas and generates gas as a waste product.
A. oxygen; carbon dioxide B. nitrogen; carbon dioxide C. carbon dioxide; nitrogen D. oxygen; nitrogen E. carbon dioxide; oxygen
In the life cycle of a pine tree, meiosis in the megasporocyte produces _________.
A. Two haploid microspores and two haploid megaspores B. Four haploid microspores C. Four haploid megaspores D. Two diploid megaspores E. Two diploid microspores
Refer to the paragraph on how caterpillar-damaged plants protect themselves by attracting parasitic wasps. What can you conclude based only on the information in the preceding paragraph?
A) The attracting terpenoid compounds are always present in the corn seedling. B) Physical injury by the caterpillar mouthparts results in the immediate release of terpenoids. C) Chemical signals from the caterpillar saliva attract the parasitic wasp. D) The parasitoid wasp is attracted by compounds produced by an injured corn plant.