A repair enzyme recognizes an incorrect structure in the DNA and directly converts it back to a correct structure. Which of the following DNA repair systems is responsible for the correction?
A. base excision repair
B. direct repair
C. indirect repair
D. nucleotide excision repair
E. methyl-directed mismatch repair
B. direct repair
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Which of the following statements is false?
1.We are in the midst of a slowly increasing trend towards species extinction. 2.Most of the causes of the current species extinction are natural causes. 3.Dodos most likely became extinct because of destruction by animals other than humans. 4.The origins of our current extinction event began tens of thousands of years ago.
The genetic material of HIV consists of _____.
a) single-stranded DNA b) single-stranded RNA c) double-stranded DNA d) double-stranded RNA e) none of the above
In an experiment on the effects of deforestation of a portion of a northern temperate deciduous forest, all the trees were removed from a small mountainside watershed area and herbicides were applied for three years to prevent regrowth. Measurements of the concentration of calcium (an important nutrient) in runoff water were taken both before and after the deforestation. Monthly measurements also were made in a similar watershed in another part of the same forest that had been left undisturbed. The findings are displayed in the graph below. (There is an image in your packet #101-105) 2002 test Based on the graph, which of the following best describes why losses of calcium did not occur immediately in the deforested watershed?
(A) It takes months to leach calcium from the soil. (B) Other minerals were more soluble and were leached out first. (C) The deforestation occurred during the winter when runoff was low. (D) Calcium is hard to detect in small amounts. (E) Leaves do not appear on deciduous trees until the spring.
Core reserves are areas where
A) humans are allowed to use and develop the areas as they see fit. B) wildlife species benefit from extensive conservation programs, including nurseries and clinics. C) only human activities that have low impact on the native wildlife are allowed. D) humans have irrevocably destroyed the local ecosystem. E) humans are forbidden from entering.