Which of the following are purines?
A) adenine and guanine
B) adenine and thymine
C) guanine and uracil
D) guanine and cytosine
A) adenine and guanine
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One would think that deleterious genes would be eliminated by natural selection, yet we have two human genetic disorders with a high carrier frequency, sickle-cell anemia and cystic fibrosis. Why has this high frequency for these conditions remained in the population?
What will be an ideal response?
Which area of the United States experiences rainfall with the lowest pH?
a. southwest b. southeast c. northeast d. Midwest e. northwest
Which of the following pairs would be classified as prokaryotes?
a. Animalia and Plantae b. Bacteria and Archaea c. Fungi and Plantae d. Bacteria, Archaea and Fungi e. Fungi, Plantae and Animalia
Benzoic acid is largely a(n) (antifungal/antiprotozoal/pickling) agent and does not affect the growth of many bacteria.
Fill in the blank(s) with the appropriate word(s).