Which of the following is classified as a trace element in the human diet?
a. potassium
b. iron
c. sulfur
d. magnesium
e. sodium
B
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The lightly shaded countries have diversified export bases. The darkly shaded countries depend on ________ for foreign exchange (export earnings)
A) one or two commodities B) the service sector C) energy resources D) tourism E) both a and b
Mutagenesis ____
a. is an example of spontaneous mutation b. acts directly on proteins by causing them to unfold c. occurs due to a single mRNA being translated by too many ribosomes simultaneously d. is the production of mutations in a laboratory by exposure of a living organism to a mutagen e. occurs when errors made by DNA polymerase are not repaired
The scientific name of humans is Homo sapiens. What is the species of humans?
A. Homo B. sapiens C. Homo sapiens D. Animalia E. Eukarya
Which of the following is the best explanation for why vegetable oil is a liquid at room temperature while animal fats are solid?
A) Vegetable oil has more double bonds than animal fats. B) Vegetable oil has fewer double bonds than animal fats. C) Animal fats have no amphipathic character. D) Vegetable oil has longer fatty-acid tails than animal fats have.