All human DNA is nearly identical. Only about ____ of the DNA sequences of two people will differ. Even so, this difference still translates to roughly ______ base-pair differences.
A) 1 percent; 3 million
B) 0.1 percent; 3 million
C) 1 percent; 10 million
D) 0.1 percent; 100
E) 0.1 percent; 1 million
Ans: B) 0.1 percent; 3 million
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Weight loss dieting in humans has been shown to ____
a. increase absolute numbers of Firmicutes bacteria b. decrease absolute numbers of Firmicutes bacteria c. increase the abundance of Firmicutes bacteria relative to Bacteroidetes bacteria d. decrease the relative abundance of Firmicutes bacteria relative to Bacteroidetes bacteria e. not affect bacterial populations in human intestines
The embryo of the seed contains primarily
a. lipopolysaccharides. b. proteins and vitamins. c. cellulose. d. fructose. e. none of these.
Which of the following statements is false concerning the outermost layer of the epidermis?
a. It is the first to experience any abrasion. b. Keratin provides waterproofing. c. Millions of cells are worn off daily. d. Its cells are undergoing rapid cell division. e. It is called the stratum corneum.
Endospores are
A. metabolically inactive. B. resistant to heat and chemical destruction C. resistant to destruction by radiation. D. All of the other choices are correct. E. living structures.