Many plants are filled with toxins that kill or deter herbivores. Many plants sequester these compounds within the cell. Where in the plant cell are these toxic substances most likely stored?
A. Mitochondria
B. The stroma
C. Central vacuole
D. Amyloplasts
E. Lysosomes
Answer: C
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Estrogens from birth control pills
a. are excreted in the urine. b. are removed during standard wastewater treatment. c. can cause female fish to develop male traits. d. have different effects in fish than those of industrial estrogen-mimicking pollutants. e. do none of these.
Which one of the following is necessary for messenger RNA to be formed in the nucleus?
A. Ribosomes must be present. B. The cell must have an abundant supply of DNA nucleotides. C. RNA polymerase must be present and functioning. D. Chromosomes must be synapsed.
Radula modification allowed all of the following functions in gastropods except
A. eating vegetation. B. boring holes in other mollusk shells. C. injecting poison through a harpoon-like structure. D. protecting themselves with nematocysts. E. scraping algae off rocks.
What physical features characterize the deep sea? Describe three factors
What will be an ideal response?