Recently a class of infectious proteins with no associated nucleic acid have been identified. They are referred to as
A. bacteriophages.
B. latent viruses.
C. viroids.
D. prions.
E. virions.
D. prions.
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Viruses, viroids, and prions all
A. operate intracellularly. B. may be considered acellular agents of disease. C. contain DNA. D. infect only animals. E. operate intracellularly AND may be considered acellular agents of disease.
Recently, the bones (not fossils) of a possible new species of humans (in the genus Homo) have been found on an island in Indonesia (an island nation southeast of Asia)
Using radiometric dating, scientists can show that these people were alive as recently as 17,000 years ago. According to the information in this chapter, why do you think they probably used tools?
The endosymbiont theory is supported by all of the following evidence except for which statement?
A. Mitochondria are surrounded by two membranes. B. Mitochondria have a matrix. C. Mitochondria divide by binary fission. D. Mitochondria contain circular molecules of DNA. E. Mitochondrial ribosomes are similar to bacterial ribosomes.
Gram staining of the patient's samples would help to identify which type of pathogens?
A. bacteria B. prions C. viruses D. fungi