The viridans streptococci are:
A. not entirely groupable by Lancefield serology.
B. the most numerous residents of the oral cavity.
C. opportunists that can cause subacute endocarditis.
D. introduced to deeper body tissues by dental or surgical procedures.
E. All of the choices are correct.
Answer: E. All of the choices are correct.
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Regulation of an enzyme's activity occurs
A) transcriptionally. B) translationally. C) posttranslationally. D) at any point on the enzymatic production pathway.
The site-specific recombinases are similar to topoisomerases in what way?
A. They introduce supercoils. B. They require ATP hydrolysis for their activity. C. They promote phosphoryl group transfers in which the net change in free energy is close to zero. D. They also assist in compaction of the DNA. E. They mediate strand invasion reactions.
Biologists think that all organisms alive today descended from organisms that lived before. In fact, they feel that we can trace any living organism back to the origin of life on Earth. Explain how metabolism fits into this thinking
What will be an ideal response?
As you know, all living things require a source of nutrients. Using animals as an example, explain what these nutrients are used for once they leave the digestive tract
What will be an ideal response?