Ultraviolet light is a mutagen, but humans need some exposure to it to synthesize vitamin D. The amount of ultraviolet light that penetrates the skin depends on the skin's pigmentation: more melanin (skin pigment) means less penetration
Certain mutations result in decreased
melanin production. Such mutations:
A. are harmful only if inherited from both
parents.
B. are beneficial only if inherited from both
parents.
C. are neutral only if inherited from one
parent, not the other.
D. may be harmful in one environment and
beneficial in another.
D
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For ions with a charge of one, which of the following is equal to one milliequivalent?
a. 0.5 millimole b. 2 millimole c. one millimole d. 0.1 millimole
Members of the alveolates are characterized by the presence of:
a. two or more flagella b. chloroplast pigments c. crystalline rod in the flagella d. contractile vacuoles surrounded by a pellicle. e. flattened vesicles under the plasma membrane.
The most frequent category of cancer is
A) carcinoma. B) sarcoma. C) lymphoma. D) leukemia. E) None of the above categories is the most frequent.
Aposematic coloration is also called habituation. Indicate whether the statement is true or false