The most severe mass extinction occurred at the end of the Permian Period
Indicate whether the statement is true or false.
T
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RNA and proteins combine in cells to form structures called ribosomes. Ribosomes contain the active site for peptide bond formation. Based on their chemical structures, do you think protein or RNA molecules actually form the active site within the ribosom
A) protein, because RNA cannot catalyze reactions B) RNA, because proteins cannot catalyze a reaction that involves another protein C) proteins, because only proteins can catalyze a reaction that involves another protein D) It could be either, because both molecules have catalytic properties.
Plant hormones _____
a. may have multiple effects c. are active in adult plants b. are active in developing plant embryos d. are all of these
In gymnosperms and angiosperms, a plant embryo (young sporophyte) packaged with a food supply in a tough outer coat is a
A. sperm. B. seed. C. pollen grain. D. gemmae. E. fruit.
The evolution of __________ was crucial in the
evolution of plants from aquatic to terrestrial environments. a. roots b. leaves c. stems d. stomata e. all of these