What can cause a buildup of free radicals that damage the cell —and ultimately, the individual?
What will be an ideal response?
Missing antioxidant molecules or heritable defects in mitochondrial electron transfer chain components (at least 83 different proteins) can both cause buildup of free radicals. Free radicals accumulate and destroy first the function of mitochondria, then the cell. The resulting tissue damage is called oxidative stress.
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The carrying capacity of white-tailed deer in a certain habitat is 10 deer/km2. The deer population is presently 5 deer/ km2. Which of the following predictions is most likely for this deer population?
a. A population decrease. b. A population increase. c. A population that will remain at 5 deer/ km2. d. A population that will reach 30 deer/ km2 and then experience a crash. e. A population that will be controlled by intrinsic regulating mechanisms.
Which organisms are considered most primitive based upon the structure of their limbs?
a. bats b. reptiles c. porpoises d. penguins e. birds
Which of the following represents microbial control by osmotic pressure?
A. Placing fruit slices on a drying rack B. The crew of the Mayflower using salted meats throughout their voyage to the New World C. Pickling cucumbers and other vegetables for long-term storage D. Canning tomatoes after a summer growing season to use throughout the winter
The onset of AIDS is often accompanied by
A. a positive HIV test. B. lung infections and other opportunistic infections. C. a steep drop in T cell numbers. D. macrophage infection. E. Kaposi's sarcoma.