The greenhouse effect is
A) of little concern, since it is part of the normal cycle for the planet.
B) reduced by photosynthesis, which removes carbon dioxide from the atmosphere.
C) reduced by the addition of carbon dioxide to the atmosphere, since carbon dioxide removes excess heat from the Earth's surface and reflects it back into space.
D) made worse by photosynthesis, which adds carbon dioxide to the atmosphere.
E) reduced by the burning of fossil fuels, which removes oxygen from the atmosphere.
Answer: B) reduced by photosynthesis, which removes carbon dioxide from the atmosphere.
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The cell wall of Gram-negative organisms
A. has a thick peptidoglycan layer. B. has a thin peptidoglycan layer. C. is more permeable to various molecules than the Gram-positive cell wall. D. is characterized by an outer membrane containing LPS. E. has a thin peptidoglycan layer AND is characterized by an outer membrane containing LPS.
The zygote goes through ____ to become a(n) ____
a. cleavage; blastula b. cleavage; gastrula c. zygote formation; embryo d. cleavage; egg e. fertilization; blastula
The circles in “B” are
a. fragments of the main bacterial DNA. b. plasmids. c. cDNA molecules. d. DNA templates. e. none of these.
Which phase of mitosis involves the shortening of the microtubules as the chromosomes move toward the poles?
A) Anaphase B) Prophase C) Metaphase D) Telophase