What is the cause of Huntington disease?
A) a mutation that results in defective amino acid synthesis
B) a mutation that results in defective DNA polymerase
C) a somatic cell mutation that causes cells to proliferate without control
D) a mutation in which there are repeating groups of three nucleotides
E) loss of the chromosome with the gene for a blood protein
Answer: D
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Fluid-filled sacs that may store amino acids, sugars, toxins, and ions in plant cells are called ____
a. plastids b. central vacuoles c. peroxisomes d. vesicles e. Golgi bodies
Ovaries contain numerous _____, each a capsule that surrounds an egg.
A. areolas B. cilia C. infundibula D. follicles
Zero population growth is achieved
a. when a population reaches the carrying capacity of the environment. b. when emigration and immigration are balanced, and the number of births equals the number of deaths. c. anytime that births exceed deaths. d. anytime that deaths exceed births. e. when emigration and immigration are prevented.
In 1927, the U.S. Supreme Court upheld the right of states to use ____________________ as a means of preventing
reproduction by those deemed “unfit.” Fill in the blank(s) with the appropriate word(s).