SIV causes symptomless infections in monkeys and apes, yet causes AIDS-like disease in chimpanzees. HIV is closely related to SIV and causes AIDS in humans. Which of the following is the best explanation for these observations?
a. Monkeys, apes, and chimpanzees are all genetically very similar
b. The effects of viruses on different species is random
c. Chimpanzees and humans have a more recent common ancestor
d. SIV is most likely lytic in apes and monkeys
e. SIV is most likely latent in chimpanzees
c. Chimpanzees and humans have a more recent common ancestor
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A researcher in a lab finds a microscopic organism that is a producer. Populations of this organism are found in
extreme environments (e.g., hot springs). The researcher will correctly identify this organism as belonging to the domain ____.
a. Amoeba b. Eukarya c. Archaea d. Bacteria e. Animalia
The tertiary structure of a polypeptide refers to
A) its size. B) the presence of pleated sheets. C) the amino acids of which it is made. D) the overall three-dimensional structure.
All of the following are barriers to breastfeeding EXCEPT
Select one: a. lack of role models. b. expense. c. misinformation. d. fear of appearing immodest.
Which of the following statements regarding Ehrlichia is FALSE?
A) It usually causes a spotted rash similar to Rocky Mountain spotted fever. B) The organism reproduces inside the host's phagosomes. C) It is transmitted by ticks. D) It is an emerging infectious disease. E) It has three stages: elementary body, initial body, and morula.