All fungi are _____
A) symbiotic
B) heterotrophic
C) flagellated
D) pathogenic
E) decomposers
Answer: B
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Which one of the following statements is true of the 32 allele in the CCR5 gene? (Choose all that apply)
A. It codes for a mutant protein that is completely inactive. B. It leads to a deletion which maintains the reading frame. C. It provides some protection against HIV progression to AIDS in both its heterozygous and homozygous forms. D. It is an example of a beneficial mutation. E. It affects the attachment of HIV to an animal cell by altering one of the viral proteins.
Which of the following do researchers suspect is an important factor in colony collapse disorder (CCD?)
a. Habitat fragmentation caused by land development inhibits a bee’s chance of finding a reproductive partner. b. Long-term exposure to low levels of insecticides impair a plant’s ability to produce nectar that a bee can use. c. Exposure to extremely high levels of herbicides can kill an entire population of plants and the bees that depend on them. d. Herbicides kill the plants that bees pollinate thereby eliminating the source of nectar for a bee. e. Long-term exposure to low levels of insecticides impair a bee’s ability to navigate and communicate.
An unscrupulous dog breeder has been selecting for dogs that have very large litters, with the goal of maximizing profits. Why might this strategy be counterproductive?
A. Intrauterine cannibalism will reduce the number of puppies. B. It will cost too much money to feed all those puppies. C. The puppies from large litters are likely to be malnourished, and the mother will have few resources to devote to future litters. D. Litter size is not influenced by genetics.
Many types of cells have stores of lipids in their cytoplasm, usually seen as fat droplets. What is the lipid most commonly found in these droplets?
(a) cholesterol (b) palmitic acid (c) isoprene (d) triacylglycerol