You suspect a 100-nm structure is present in a cell. Which of the following provides the lowest magnification that you can use to see this structure?
a. Transmission electron microscope
b. Phase-contrast microscope
c. Scanning electron microscope
d. Brightfield microscope
e. Darkfield microscope
Answer: c. Scanning electron microscope
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Covalent modification of enzymes most commonly uses phosphoryl, methyl, and adenyl groups.
Answer the following statement true (T) or false (F)
Would a two-letter code with four different nucleotides be sufficient to encode the 20 amino acids found in cells? Why or why not? What does the three-letter code imply about the nature of the genetic code?
What will be an ideal response?
Involves study designs used to answer why? and how?
a. analytic epidemiology b. descriptive epidemiology c. differential epidemiology d. none of the above
Which concept represents the highest degree of certainty?
A. Hypothesis B. Deduction C. Assumption D. Theory E. Prediction