Which statement best describes an electron transfer chain?
A. It generates energy from carbohydrates.
B. It is used by cells to dispose of excess electrons.
C. It utilizes ATP to synthesize nutrients.
D. It transfers energy, stepwise, from one compound to another.
E. It requires activation by oxygen.
Answer: D
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Which of the following accurately describes the process used to make Dolly the sheep?
A. Mitochondrial DNA was taken from one female and injected into the mammary of another female. B. A sheep embryo was produced by in vitro fertilization. At an early stage, the cells of the embryo were separated, and each cells was put into a surrogate sheep mother. C. A mammary cell of one sheep was fused with an enucleated egg of another sheep. The resulting diploid embryo was placed in a surrogate sheep mother. D. A set of twins — one male and one female — were mated. Since the twins had identical DNA, their lamb was a clone. E. The sheep to be cloned was given a drug that induced the cells of her ovary to divide by binary fission. The resulting diploid eggs did not need to be fertilized.
In the stomach, food processing continues and secretions from stomach glands aid the initial digestion of
A. carbohydrates. B. lipids. C. nucleic acids. D. proteins. E. vitamins.
Foods that are potentially poisonous or inedible can often be detected by the ________ taste receptors, which are located at the very back of the tongue
Fill in the blank(s) with correct word
What is the primary purpose of the light reactions of photosynthesis?
A) to remove carbon dioxide gas from the atmosphere B) to release electrons needed to convert solar energy to chemical energy C) to create oxygen gas D) to produce glucose