In bryophytes, flask-shaped gametangia that enclose a single egg are called
a. sporangia
b. telopodium
c. archegonium
d. antheridium
e. oogonium
Answer: c. archegonium
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Hexaploid wheat was produced synthetically by He and co-workers. They mated the diploid species, Aegilops tauschii, and the tetraploid species, T. turgidum. Which of the following is an accurate statement about the relative contribution of each parent
to the genome of the hexaploid offspring? A) Each parent contributed equally to the genome of the offspring. B) Aegilops tauschii contributed four chromosomes by failing to complete meiosis after chromosome replication, and T. turgidum contributed two chromosomes. C) Aegilops tauschii contributed two sets of chromosomes, and T. turgidum contributed four sets of chromosomes. D) The hexaploid number appeared following mitosis with no subsequent cell division.
Which of the following is NOT a part of the concept of organic farming?
A. use of organic fertilizers B. use of growth regulators C. nonuse of pesticides D. nonuse of inorganic fertilizers E. use of composted wastes
Cross-bridges form between _____ and _____ during muscular contraction.
A. actin, myosin B. actin, tropomyosin C. myosin, troponin D. myosin, tropomyosin E. troponin, calmodulin
Imagine that a plant in your garden doesn't receive an adequate amount of water. Which of the following would be most affected by this?
A) Neither the light reactions nor the Calvin cycle of photosynthesis B) The Calvin cycle of photosynthesis only C) The light reactions of photosynthesis only D) Both the light reactions and the Calvin cycle of photosynthesis