bi Benchmark 2 (midpoint)

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1. 1. Incidence counts new cases in a period; prevalence counts:

   AAll existing cases at a point in timeBOnly new casesCOnly deathsDThe population

2. 2. "Morbidity" refers to illness; "mortality" refers to:

   ADeathBRecoveryCBirthDIllness too

3. 3. Contact tracing slows an outbreak by:

   AFinding and notifying exposed peopleBCuring the disease instantlyCCounting the populationDAdvertising

4. 4. The dose-response principle says the harmful effect generally depends on:

   AThe amount of exposureBThe chemical's colorCThe brand nameDNothing

5. 5. Bioaccumulation means a substance:

   ABuilds up and concentrates up the food chainBBreaks down instantlyCAffects only plantsDVanishes in predators

6. 6. To judge a community's risk from a pollutant, you most need its:

   AConcentration and exposure over timeBBottle brandCRiver colorDResidents' names

7. 7. Most sick people ate at the same place first. This suggests:

   AA common source of exposureBPure coincidenceCA genetic diseaseDAn unrelated event

8. 8. A public-health message works best when it is:

   AClear and tailored to its audienceBFull of jargonCThe same dense text for allDHidden

9. 9. A trustworthy public-health recommendation is:

   ABacked by data and tied to evidenceBOne person's opinionCMade to scareDKept secret

10. 10. When sharing outbreak data publicly, you must protect:

    AIndividual patient privacyBNothingCOnly the logoDThe font

11. 11. Public-health surveillance is used to:

    ATrack disease patterns to direct responseBSell productsCReplace doctorsDHide data

12. 12. A restriction enzyme is used to:

    ACut DNA at a specific sequenceBJoin fragmentsCCopy DNADRead DNA

13. 13. DNA ligase's job in cloning is to:

    AJoin the insert into the cut plasmidBCut the plasmidCDestroy the insertDStain DNA

14. 14. Only transformed colonies grow on an antibiotic plate because the plasmid carries:

    AA resistance gene (selectable marker)BExtra foodCA lethal geneDNothing

15. 15. A DNA ladder on a gel is used to:

    AEstimate fragment sizesBAdd colorCFeed bacteriaDCut DNA

16. 16. "Competent" cells are cells that:

    ACan take up outside DNABAre skilled techniciansCCannot accept DNADAre dead

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