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
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A community in ecology is defined as ________.
A. populations from multiple species interacting in the same place, and their surrounding environment B. living and nonliving things in one place C. populations from multiple species interacting in the same place D. a population and its surrounding environment
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.
Treatment of gas gangrene may involve ________.
A. antitoxins B. wound debridement C. hyperbaric chambers D. All of the choices are correct.
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