When exposed to water, sodium chloride (NaCl) ____.
A. dissolves into Na+ and Cl- ions
B. crystallizes into a solid
C. dissolves into Na- and Cl+ ions
D. crystallizes into a liquid
E. forms a hydrophobic compound
Answer: A
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a. 10% b. 25% c. 50% d. 99% e. 100%
The proportion of the air we breathe accounted for by oxygen is approximately
A. 50%. B. 21%. C. 5%. D. 1%. E. 78%.
Puberty in males marks the start of
a. sperm production. b. testosterone production. c. the emergence of secondary sexual traits. d. fertility. e. all of these.
The syntenic genes A and Z are linked. A cross between two parents, AAZZ and aazz, produces F1 progeny with the AaZz genotype. What are the possible arrangements of alleles on the F1 progeny's chromosomes?
A) AZ/az B) Az/aZ C) Aa/Zz D) AZ/Az or az/aZ E) A/Z or a/z