Which one of the following statements about haplodiplontic life cycles is false?
A. For each gene, cells of the gametophyte stage have a single allele.
B. Spore mother cells produce haploid spores by meiosis.
C. The gametophyte stage produces gametes by mitosis.
D. The zygote is the only diploid cell in the sporophyte stage.
E. Mitosis occurs in both sporophyte and gametophyte stages.
D. The zygote is the only diploid cell in the sporophyte stage.
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Cage exclusion studies have demonstrated that polychaetes are a common prey item of:
a. gray whales. b. crabs. c. fish. d. both b and c. e. a and b only.
Which of the following is a function of the human urinary system?
A) detoxification of waste products B) elimination of undigested foods C) regulation of water content for body fluids D) production of ammonia
Which statement about the application of insecticides is true?
A) To control agricultural pests, pest management uses biological controls, chemicals, or cultural methods, but never a combination of these. B) Simply killing many individuals is often the best way to reduce the size of a pest population. C) Most insecticides kill the pest but not the pest's natural predators. D) Pest species can rebound faster than their predators because the pests often have a higher reproductive rate than predators have.
Which of the following is not involved in body temperature homeostasis?
A. the hypothalamus B. secretion by sweat glands C. shivering D. constriction or dilation of blood vessels E. respiration rate