Virulence factors of S. pyogenes include
A. hyaluronic acid capsule.
B. polysaccharides on the cell wall.
C. lipoteichoic acid.
D. spiky M proteins.
E. All of the choices are correct.
Answer: E
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The epsilon (?) subunit of DNA polymerase III of E. coli has exonuclease activity. How does it function in the proofreading process? The epsilon subunit _____
A) removes a mismatched nucleotide B) excises a segment of DNA around the mismatched base C) can recognize which strand is the template or parent strand and which is the new strand of DNA. D) adds nucleotide triphosphates to the end of the growing DNA strand
Which of the following statements about the advantages of segmentation is FALSE?
a. Each segment in an animal may include a complete set of organs. b. Segmentation allows for flexibility in movement. c. Segmentation allows for control over movement. d. Segmentation allows for the animal to have a body cavity. e. A segmented animal may survive damage to organs in one segment because of redundancy in another segment.
Explain how the structures of tracheids and vessel elements are specialized for their conduction of water and dissolved
minerals. What will be an ideal response?
A potential shortcoming of the probit/logit models is that to get consistent estimates of the parameters:
A. coefficient estimates cannot be evaluated against alternative hypotheses. B. moment conditions are required for each parameter to be estimated. C. the unobservables must be distributed via the standard normal (for probit) and logistically (for the logit). D. the determining function must be linear.