Which of the following statements regarding viral diseases is false?
A) RNA viruses tend to have an unusually high rate of mutation because their RNA genomes cannot be corrected by proofreading.
B) New viral diseases often emerge when a virus infects a new host species.
C) Very few new human diseases have originated in other animals because the genetic differences are too great.
D) AIDS was around for decades before becoming a widespread epidemic.
Answer: C
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All of the following represent anchoring junctions EXCEPT
A. tight junctions. B. focal adhesions. C. hemidesmosomes. D. desmosomes. E. adherens junctions.
What is an advantage of self-pollination?
a. increased genetic diversity b. reduced genetic disorders c. lower investment in pollen d. less competition for resources
Which of the following methods of DNA amplification does NOT require cloning?
a. reverse transcription b. polymerase chain reaction c. cloned DNA d. reverse transcription and polymerase chain reaction e. polymerase chain reaction and cloned DNA
Which of these is not the result of hydrogen bonding between water molecules?
A) high surface tension B) ability to dissolve polar substances C) high specific heat D) low density when frozen E) lack of color, odor, or flavor