How can a living cell increase the rate of a chemical reaction?
A. By lowering the pH of the cytoplasm.
B. By raising the pH of the cytoplasm.
C. By increasing the entropy of the reactants.
D. By using a catalyst.
E. By raising the temperature.
D. By using a catalyst.
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Which of the following statements describes Neanderthals?
A. They are also called Cro-Magnons for the site where they were first discovered. B. They are believed to have given rise to Homo sapiens. C. They were the first bipedal hominins discovered. D. They are a separate species that is closely related to Homo sapiens.
Which is the closest living nonvascular relative to vascular plants?
a. hornworts b. liverworts c. mosses d. ferns e. red algae
One of the roles of histone proteins in eukaryotes is ___________
a) control of gene expression by preventing digestive enzymes from degrading the DNA. b) control of gene expression by allowing transcriptional enzymes variable access to the DNA. c) keeping sister chromatids together until they should separate during cell division. d) allowing microtubules to attach to the kinetochores.
Different kinds of mycorrhizae occur in different ecosystems. For example, as you walk up a mountain, you might find one type of mycorrhizae in lower regions and a second, different type of mycorrhizae in higher regions. Why are there mycorrhizae
specific to certain ecosystems? A) Mycorrhizae are adapted to the altitude. B) Mycorrhizae are adapted to the type of slope of the land. C) Mycorrhizae tend to colonize all levels of the mountain. D) Mycorrhizae are adapted to the type of soil and the type of vegetation present.