A population declines when
A. animals are removed randomly.
B. death rate exceeds reproductive rate.
C. reproductive and death rates are equal.
D. reproductive rate exceeds death rate.
E. smaller animals are selectively removed.
B. death rate exceeds reproductive rate.
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Not all plants have seeds. What main advantage do seeds provide a plant?
A. Seeds allow plants to produce needles. B. Seeds allow plants to grow tall. C. Seeds allow plants to be independent of water for reproduction. D. Seeds allow plants to alternate generations.
The early Earth's reducing atmosphere probably contained all of the following except
A. water. B. hydrogen sulfide. C. carbon dioxide. D. oxygen. E. methane.
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 males. B. chromedome is dominant in females and recessive in males. C. chromedome is dominant in males and recessive in females. D. chromedome is an X-linked gene. E. chromedome is imprinted in females.
Which of the following methods would be used to measure the concentration of bacterial contamination in processed peanut butter?
a. turbidity measurement b. total plate count c. dry weight measurement d. direct counting of bacteria on a calibrated slide under the microscope