If a cell were unable to produce histone proteins, which of the following would be a likely effect?
A) There would be an increase in the amount of "satellite" DNA produced during centrifugation.
B) The cell's DNA couldn't be packed into its nucleus.
C) Spindle fibers would not form during prophase.
D) Amplification of other genes would compensate for the lack of histones.
Answer: B
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Why do oils form a significant part of the nutritional reserves in many seeds?
A. Oils help keep the embryo hydrated, allowing the seed to survive in dry habitats. B. The oils reduce the density of the seed and allow for water dispersal. C. Oils contain more mineral nutrients than carbohydrates. D. Oils store twice as much energy as an equivalent mass of starch. E. Hormones diffuse more quickly through oils.
Active transport is characterized by:
What will be an ideal response?
Why is genetic variation important in helping a species survive?
a) the more varied a population, the less likely the environment is to change b) if the environment changes, some members of the species will probably have adaptations that enable them to survive and reproduce c) if the environment stays the same, a species with genetic variety will probably evolve rapidly d) disease rarely affects a population that has a lot of genetic variety
Populations have three basic types of dispersion patterns-clumped, random, and uniform. What situation supports random distributions?
A. When there is an even distribution of resources. B. When individuals of the population are in competition for resources. C. When individuals of the populations do not interact strongly with one another. D. When individuals of the population display social interactions.