The two types of bonding found in a DNA
molecule are
a. ionic and covalent.
b. covalent and peptide.
c. ionic and hydrogen.
d. peptide and hydrogen.
e. covalent and hydrogen
E
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The nitrogenous base adenine is found in all members of which group?
A. proteins, triglycerides, and testosterone B. ? glucose, ATP, and DNA C. proteins, carbohydrates, and ATP D. proteins, ATP, and DNA E. ATP, RNA, and DNA
In humans, male-pattern baldness may be assumed to be controlled by an autosomal gene that occurs in two allelic forms. Allele B determines nonbaldness, and allele b determines pattern baldness. In males, because of the presence of testosterone, allele b
is dominant over B. If a man and woman both with genotype Bb have a son, what is the chance that he will eventually be bald? A) 0% B) 25% C) 33% D) 50% E) 75%
The human circulatory system can be described as which of the following?
a. a closed system b. an open system c. a somatic response d. a voluntary process
The primitive Earth's atmosphere did NOT contain
a. free oxygen. b. free nitrogen. c. free hydrogen. d. water vapor. e. inert gases.