What is true about the data in the accompanying figure?
A) The solid line represents a reaction that has been catalyzed by an enzyme.
B) The dashed line represents a reaction that includes an enzyme and a cofactor.
C) Both lines represent endergonic reactions.
D) The energy of the products is higher than the energy of the reactants.
Answer: A
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Which of the following cells contain a plasma membrane?
A. Bacterial cells only B. Animal cells only C. Animal cells, plant cells, and bacterial cells D. Animal cells and plant cells only
The two strands of DNA are held together by ________; thus ________
A) covalent bonds; double-stranded DNA is very stable at a range of temperatures B) ionic bonds; double-stranded DNA separates into two separate strands in water C) hydrogen bonds; double-stranded DNA separates into two separate strands at high temperatures D) antiparallel bonds; double-stranded DNA is amphipathic E) hydrophobic interactions; double-stranded DNA separates into two separate strands when dissolved in a hydrocarbon (hydrophobic) solvent
Is it possible that the carbon atoms in your body may have once made up the living tissues of another person or animal in earlier times? This is
A. impossible since carbon can't enter a living system more than once. B. possible since carbon cycles through the biosphere. C. possible only if you are a cannibal. D. highly unlikely since carbon is always tied up in molecules in organisms or minerals.
Insect workers propagate more of their own alleles by helping their mother reproduce rather than by reproducing themselves; thus, they share a larger fraction of their ________ with the next generation.
A. ability to defend their nest B. home C. time D. food resources E. genome