Free radicals, highly reactive species with unpaired electrons that damage molecules and cells, and can contribute to
aging. Coenzyme Q (also known as ubiquinone or CoQ) is often found in lotions and moisturizers. Given what you know
about the role of CoQ in cellular respiration, why would it be added to these products?
a. It recruits free radicals to help increase the rate of glycolysis in skin cells.
b. It absorbs free radicals that can cause damage to skin cells.
c. Removing free radicals decreases the rate of metabolism and slows growth of skin cells.
d. It allows for the regeneration of new skin cells.
e. It drives the spontaneous death of older skin cells that have accumulated too many free radicals.
ANSWER: b
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All living things need carbon. How does most carbon enter the living portion of an ecosystem?
A. Atmospheric CO2 taken in by photosynthesis B. Elemental carbon taken in by plant roots C. Elemental carbon taken in by plant leaves D. Atmospheric CO2 taken in by soil bacteria
Which of the following statements is NOT true of protistan cysts?
A. They may arise from asexual reproduction. B. They may arise from sexual reproduction. C. Their consumption can lead to human health problems. D. They facilitate the spread of pathogens from one host to another. E. They attach to host cells by small hooks.
Animals apparently evolved:a
in freshwater. b. in the ocean. c. during the Cambrian explosion. d. in swamps. e. during the Devonian.
Which human cell type can be over a meter in length?
a. neurons b. chondrocytes c. columnar epithelial cells d. skeletal muscle cells e. adipocytes