Which of the following are examples of prevalence data?

  1. All cases of tuberculosis found in a mass chest x-ray survey.
  2. All reported new cases of influenza in a one-month period.
  3. All reported new cases of cancer in a single year.
  4. All cases of coronary heart disease found during an initial examination of persons included in a community survey.

Which chemical functional group is part of the control mechanism for many enzymes and serves as a big blinking light in signal transduction?

a. sulfhydryl



d. methyl

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