In conifers, meiosis of diploid cells in an ovule produces ____.

A. microspores
B. pollen sacs
C. pollination droplets
D. pollen grains
E. megaspores


Answer: E

Biology & Microbiology

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Chemical signals that are released by one cell and act locally on neighboring cells are referred to as:

A. paracrine signals. B. autocrine signals. C. hormones. D. pheromones. E. neurotransmitters.

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Treatment of gas gangrene may involve ________.

A. antitoxins B. wound debridement C. hyperbaric chambers D. All of the choices are correct.

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The process of crossover is best defined as genetic recombination that occurs between ________.

a. non-sister homologous chromatids in meiotic prophase I b. sister chromatids in meiotic prophase II c. non-sister chromatids in meiotic prophase II d. sister chromatids in meiotic prophase I

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