Eight hundred million years ago, what change in atmospheric conditions coincided with an increase in eukaryotic diversity?
A. decrease in CO2
B. increase in O2
C. increase in sulfur
D. None of these choices are correct.
B
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In lab, you are studying the long term effects of elevated carbon dioxide levels on photosynthesis in C3 and C4 plants. The C3 and C4 plants are growing in separate closed chambers. Both chambers are constantly given elevated but equal amounts of carbon dioixde. Which of the following are likely results of this experiment? Check all that apply.
_____ There would be a decrease in O2 levels in both chambers. _____ There would be an increase in O2 levels in both containers. _____ Both the C3 and the C4 plants would show equal gains in biomass. _____ The C4 plants would gain more biomass relative to the C3 plants. _____ The C3 plants would gain more biomass relative to the C4 plants.
In comparing mitosis and meiosis, which of the
following statements is true? a. Meiosis I is more like mitosis than is meiosis II. b. Both processes result in four cells. c. Pairing of homologues occurs in both. d. Chromatids are present only in mitosis. e. Meiosis II resembles mitosis
Which of the following is false?
a. Periderm is a primary tissue. b. There is no tissue in animals that corresponds to meristem tissue of plants. c. Growth from cell division at the tips of stems and roots produces primary growth. d. Divisions of the lateral meristem increase the diameter of the roots and stems. e. Lateral meristem activity produces secondary growth.
Which of the following statements is true?
A) Even in a seemingly clear-cut example of complete dominance, at the protein or enzyme level, one can detect about half the activity or gene product. B) In the threshold effect, one would expect the gain of function mutant to be recessive. C) With both incomplete dominance and codominance, one expects heterozygous and homozygous classes to be phenotypically identical. D) The threshold effect is only seen in incomplete dominance, not in codominance. E) An individual won't show incomplete dominance if one allele is a loss of function allele.