A mutation results in the loss of the finger-like cell wall ingrowths found in normal placental transfer tissues. What effect is this mutation most likely to have on the development of the embryo?
A. The embryo will develop at a slower rate because the rate of nutrient transfer from mother to embryo will be decreased.
B. The embryo will develop too quickly because the rate of nutrient transfer from mother to embryo will be increased.
C. The embryo will be unaffected because plant embryos are not dependent on transfer of nutrients from maternal tissues.
D. The embryo will be unaffected because the cell wall ingrowths of placental transfer tissues have no effect on nutrient transfer from maternal tissues.
E. The embryo will be unable to develop because necessary sugars can no longer be transported across the plasma membrane.
A. The embryo will develop at a slower rate because the rate of nutrient transfer from mother to embryo will be decreased.
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A scientist is analyzing air bubbles trapped in ancient rocks that can be used to understand the ancient atmosphere. What do you expect the scientist will observe when comparing rocks younger than 3.8 billion years old to rocks older than 3.8 billion years?
A. The ratio of the carbon-12 isotope will be lower in the younger rocks, because living organisms preferentially use carbon-12 over other isotopes. B. The younger rocks will have higher levels of carbon dioxide, because there was no carbon dioxide in the atmosphere before animals evolved and expelled it as waste. C. The ratio of carbon-12 will be lower in the older rocks, because carbon-12 had to build up on earth before life could evolve. D. The amount of carbon will vary unpredictably in the younger rocks, because rock weathering added carbon dioxide to the atmosphere, and volcanic activity sequestered it.
The effect of directional growth shown in the above
figure is known to be caused by a. thigmotropism. b. gravitropism. c. abscisic acid. d. salicylic acid. e. all of these.
The ultimate electron acceptor from complex II is ________.
A) Q B) QH2 C) cytochrome c D) O2 E) FMN
You have isolated a new organism which has eukaryotic cells, is multicellular, grows as hyphae, does not perform photosynthesis, and has a cell wall. This organism most likely belongs to which kingdom?
A) Protista B) Bacteria C) Fungi D) Archaea E) either Fungi or Protista