Which disorder is caused by the Epstein-Barr virus?
a. malaria
b. leukemia
c. infectious mononucleosis
d. anemia
e. toxemia
ANSWER: c
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Diploid (2n) cells in the ____ of mosses, ferns, gymnosperms, and angiosperms divide meiotically and form haploid (1n) spores
Fill in the blank with the appropriate word.
How does a retrovirus prepare its genetic material for incorporation into the host cell genome?
a. Viral reverse transcriptase uses viral RNA to make double-stranded viral DNA. b. Viral reverse transcriptase uses viral single-stranded DNA to make double-stranded viral DNA. c. Viral reverse transcriptase uses viral RNA to make double-stranded viral RNA. d. Host enzymes incorporate viral RNA directly into the genome. e. Host enzymes covert viral RNA to double-stranded viral DNA.
The concept that simple organic molecules could form spontaneously from simpler raw materials was
first proposed by: a. Miller and Urey. b. Charles Darwin. c. Thomas Malthus. d. Watson and Crick. e. Oparin and Haldane.
SAR11 bacteria are now thought to constitute about ________% of all microbial life on earth.
A. 75 B. 10 C. 5 D. 25