Which of the following is not true of van der Waals interactions?
A. The interaction depends on the distance between atoms.
B. Attractive and repulsive forces are balanced at the van der Waals radii for each atom.
C. Repulsive interactions arise when atoms are separated by a distance equal to the sum of their combined van der Waals radii.
D. Atoms that are farther apart than the sum of their combined van der Waals radii do not experience van der Waals forces.
E. All of these statements are true.
C
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A virgin pine forest covers a valley, and one of the inhabitants is a red squirrel species. A large volcanic eruption occurs and separates the valley with a huge lava flow, thus producing two populations of squirrels. What must occur for the two populations of squirrels to be considered separate species?
A. The two squirrel populations must feed on different species of plants. B. The environment must change so that the populations exist in distinct habitats. C. The fur color or other morphological characteristic of the two squirrel populations must become distinct. D. The two squirrel populations must select mates using different behaviors. E. The two squirrel populations must be reproductively isolated. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about speciation? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The simplest structure shared among all living organisms is the
A. gut. B. cell. C. photosynthetic chloroplast. D. community. E. nucleus.
How many genes are involved in determining
skin color? a. 1. b. 2. c. 10. d. 20. e. >100
During RNA processing a(n) _____ is added to the 5' end of the RNA.
a. 3' untranslated region b. a long string of adenine nucleotides c. 5' untranslated region d. coding segment e. modified guanine nucleotide