The male gametophyte generation of angiosperms is represented by:
A) the style. B) seeds. C) embryo sacs. D) pollen grains.
Answer: D
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Which of the following series is arranged in the correct sequence of occurrence during the fixation and subsequent use of nitrogen?
A. atmospheric nitrogen; bacterial nitrogenase; ammonia; conversion by plants or algae; synthesis of proteins B. atmospheric nitrogen; bacterial nitrogenase; conversion by plants or algae; ammonia; synthesis of proteins C. atmospheric nitrogen; ammonia; bacterial nitrogenase; conversion by plants or algae; synthesis of proteins D. atmospheric nitrogen; ammonia; bacterial nitrogenase; synthesis of proteins; conversion by plants or algae E. none of the other options displayed
Four of the five answers below were organic compounds included in the Miller and Urey experiment designed to study the early synthesis of organic compounds. Select the exception
a. hydrogen. b. methane. c. oxygen. d. ammonia. e. water.
In the following list of developmental events, which occurs last?
a. tissue specialization b. gamete formation c. gastrulation d. cleavage e. organ formation
Translational controls regulate the:a
activity of a protein product. b. rate at which an mRNA molecule is translated. c. rate at which an mRNA molecule is synthesized. d. uptake of nucleic acids into the cell. e. attachment of phosphate groups to polypeptides.