The current extinction rate is estimated to be at
least how much greater than the background
extinction rate?
a. 2
b. 5
c. 10
d. 50
e. 100
E
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Tritiated hydrogen (3H) differs from hydrogen (1H) in that
A. 3H has 2 more protons than 1H. B. 3H has 2 more electrons than 1H. C. 3H has 2 more neutrons than 1H. D. 3H has the same number of neutrons as 1H. E. 3H has a different electron configuration than 1H.
The importance of crossing over during meiosis is
a. to hold homologous pairs of chromosomes together. b. to result in chromosomes consisting of two identical sister chromatids. c. to result in daughter nuclei with too much or too little genetic material. d. to ensure that the developing zygote receives cytoplasm from one of the parents. e. to allow formation of parental chromosomes.
Ultraviolet light has a specific effect on the DNA molecule. It causes the formation of
a. thymine dimers. b. translocations. c. deletions. d. inversions. e. duplications.
Which statement about viruses is FALSE?
A. Viruses will usually infect any available cell, regardless of the cell type. B. The genome of a virus can be either DNA or RNA, depending on the particular virus. C. Viruses are active only when inside a cell. D. Viruses always have a protein coat.