Nokea
What are some possible hazards associated with the organochloride pesticide DDT?
- A. Bioaccumulation and reproductive toxicity.
- B. Immediate skin irritation and respiratory distress.
- C. Increased crop yield and soil fertility.
- D. Improved water quality and biodiversity.
Correct Answer: A
Rationale: DDT bioaccumulates in ecosystems and is linked to reproductive and developmental toxicity in wildlife and humans.
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Cereal protein are deficient in,
- A. Methionine
- B. Lysine
- C. Typtophan
- D. Leucin
Correct Answer: B
Rationale: Cereal proteins are typically deficient in lysine, an essential amino acid.
A number of passengers on a cruise ship have developed a gastrointestinal illness. Your case definition should include, at a minimum:
- A. Clinical criteria, plus specification of time, place, and person
- B. Clinical features, plus the exposure(s) you most suspect
- C. Suspect cases
- D. The nationally agreed standard case definition for disease reporting
Correct Answer: A
Rationale: A case definition must specify clinical criteria and the context of time, place, and person.
Temperature is......scale
- A. Ordinal scale
- B. Interval scale
- C. Ratio scale
- D. Nominal scale
Correct Answer: B
Rationale: Temperature is measured on an interval scale because it has equal intervals but no true zero point.
Once a case definition for an outbreak investigation has been established, it should not be changed.
- A. TRUE
- B. FALSE
Correct Answer: B
Rationale: Case definitions may need adjustment as new information becomes available during an investigation.
A constant rate of change would be represented by a curved line
- A. Arithmetic-scale line graph
- B. Semilogarithmic-scale line graph
- C. Both
- D. Neither
Correct Answer: A
Rationale: On arithmetic-scale graphs, constant rates appear as straight lines.