Proprionibacterium acnes, the causative agent of acne vulgaris, is present on the skin of
a. all people, regardless of age.
b. teenagers only.
c. people with acne only.
d. people with very oily skin.
Answer: A
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The laboratory method of choice to identify Mycoplasma and Ureaplasma infections is:
a. enzyme-linked immunosorbent assay (ELISA). b. direct fluorescent antibody (DFA). c. latex agglutination. d. real-time polymerase chain reaction (PCR).
What are the properties of DNA probes?
I. They are labeled with a radioactive tracer. II. They are short chains of nucleotides. III. They match the targeted DNA sequence.
a. I and II b. II and III c. I only d. I, II, and III e. III only
Which of the following generally makes skeletal muscle different from both smooth and cardiac muscle?
A) Skeletal muscles are made of cells called "fibers." B) Skeletal muscle cannot be contracted voluntarily. C) Skeletal muscle can be contracted voluntarily. D) Skeletal muscle cells have nuclei.
Suppose you are given a set of regression results on the role of a random treatment assignment experiment on the effect of an ad campaign on consumers' willingness to buy your product. The regression results report an R-squared of 0.04. How should you value the regression results?
A. Highly, despite the low R-squared it is likely the effect estimated is causal and valuable for active prediction. B. Highly, the R-squared value is still high enough to justify that the effect is causal. C. Not highly, the implied correlation of the R-squared is too low. D. Not highly, the R-squared is far too low.