If a parent cell has 22 chromosomes, the daughter cells following meiosis II will have
a. 22 chromosomes.
b. 44 chromosomes.
c. 11 chromosomes.
d. All of these are correct.
c. 11 chromosomes.
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Which of the following is a consequence of biological magnification (biomagnification)?
A) Toxic chemicals in the environment pose greater risk to top-level predators than to primary consumers. B) Populations of top-level predators are generally smaller than populations of primary consumers. C) The biomass of producers in an ecosystem is generally higher than the biomass of primary consumers. D) Only a small portion of the energy captured by producers is transferred to consumers. E) The amount of biomass in the producer level of an ecosystem decreases if the producer turnover time increases.
What type of contraception is the least effective?
A. RU486 B. the rhythm method C. condoms D. birth control pills E. All of these contraceptive methods are equally effective.
Suppose a DNA replication error is not corrected. After two cell divisions, how many of the four daughter cells
contain this mutation (assuming that the mistake was never corrected)?
a. noneb. one c. two d. three e. four
Nitrogenous waste products, such as urea and uric acid, are primarily formed because of the digestion of
A) lipids. B) carbohydrates. C) salts. D) proteins.