The cytoskeleton of cells is made of ________ .
a. phospholipids
b. nucleic acid
c. proteins
d. carbohydrates
e. lipids
Answer: c. proteins
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What is the main purpose of cellular respiration?
A. To produce sugars B. To produce oxygen C. To produce ATP D. To produce carbon dioxide
A researcher has been studying lichens in his hometown. Since he began his study, he has noticed several lichens dying in the vicinity of a new factory. What is most likely causing the decrease in lichen populations?
A. the diversion of water sources to the factory (i.e., lichens are drying out) B. an increase in air temperature, the result of CO2 emissions from the factory C. the blocking of sun by the factory (i.e., the lichens aren't getting enough sunlight) D. an increase in industrial pollutants in the area
You discover a gene that results in a complete lack of hair in rats, and you name the gene "chromedome." A cross of homozygous normal and homozygous bald rats results in all bald rats. You conclude that the baldness allele is dominant, but when you repeat the cross with different rats none of the offspring are bald. Extremely puzzled you study your records and discover that in the first cross the bald rat was female, while in the second cross the bald rat was male. What do you conclude from this information?
A. Chromedome is imprinted in females. B. Chromedome is imprinted in males. C. Chromedome is dominant in females and recessive in males. D. Chromedome is dominant in males and recessive in females. E. Chromedome is an X-linked gene.
Four of the five statements below are consistent with
Darwin’s theory of natural selection. Select the exception. a. All populations tend to overproduce. b. Some members are more adapted to the rigors of competition. c. Limited resources put limits on population growth. d. Variation in individuals is not inheritable. e. Traits appear and disappear.