According to the concept of punctuated equilibrium, _____
A) natural selection is unimportant as a mechanism of evolution
B) given enough time, most existing species will gradually give rise to new species
C) a new species accumulates most of its unique features as it comes into existence
D) evolution of new species features long periods during which changes are occurring, interspersed with short periods of equilibrium, or stasis
C
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Examine the digestive system structures in the figure above. Bacteria that produce vitamins are found in the greatest concentration in location _____
A) 3 B) 4 C) 5 D) 7 E) 8
The reason coral reefs are among the most productive and successful ecosystems is due to
A. commensalisms. B. the lichen mutualistic relationship. C. the coral-dinoflagellate mutualistic relationship. D. All of the choices are correct.
When the chromosome is most condensed, which
of the following is true? a. Proteins are used to wind up the DNA. b. They are less susceptible to radiation. c. Lipid droplets form “beads on a string.” d. Carbohydrates wind the DNA into clusters. e. None of these are true.
How do companion cells load most of the carbohydrates into sieve tube members?
a. by symport b. through carrier proteins c. through plasmodesmata d. by antiport