pbs Benchmark 2 (midpoint)

Enter your Student ID and answer each item. This is a check against the WebXam blueprint, not a grade. You will see some of these questions again at the next checkpoint.

1. 1. "The floor is wet" is an observation. "Someone spilled water" is:

   AAn inferenceBAn observationCA predictionDA measurement

2. 2. In an experiment, the variable you change on purpose is the:

   AVariable held constantBDependent variableCComparison control groupDIndependent variable

3. 3. Genetic information flows:

   ADNA to protein to mRNABprotein to mRNA to DNACDNA to mRNA to proteinDmRNA to DNA to protein

4. 4. The mRNA codon AUG signals:

   AA stop signal in translationBThree amino acids in a rowCStart (methionine)DThe start of transcription

5. 5. A point mutation (one DNA base replaced by another) can change a protein by:

   AAdding an extra chromosomeBShifting the codons after itCSwapping one amino acidDRemoving the entire gene

6. 6. Three copies of chromosome 21 indicates:

   AA typical karyotypeBTrisomy of chromosome 21CA point mutation in one geneDMonosomy of chromosome 21

7. 7. Two carriers (Aa x Aa) have a child. Chance the child is affected (aa):

   A25%B50%C0%D75%

8. 8. A differential diagnosis is:

   AA single confirmed diagnosisBA list of lab tests to orderCA ranked list of possible conditionsDThe treatment plan chosen after testing

9. 9. Which group lists vital signs?

   ABlood type, eye color, hair color, and handednessBTemperature, pulse, respiration, blood pressureCHeight, weight, age, and body mass indexDName, address, and date of birth

10. 10. An epidemic curve plots:

    ACost of the responseBBeds and staff availableCWhere cases live on a mapDNew cases over time

11. 11. Incidence measures:

    AExisting cases at one point in timeBNew cases in a periodCDeaths from the diseaseDThe size of the population at risk

12. 12. In mass-casualty triage, who is treated first?

    AThe most severely injured, whatever the oddsBThe least injured, to clear them quicklyCMost urgent but treatableDWhoever arrived at the scene first

13. 13. Before handling a chemical, you check its SDS to learn:

    AThe step-by-step lab procedureBThe container's color code aloneCPurchase date and supplier costDHazards, PPE, and first aid

14. 14. Chain of custody for evidence records:

    AThe suspect's statement about the sceneBWho handled it, when, and transfersCThe lab method and the final resultDJust the officer who collected it

15. 15. A blood specimen tube should be:

    AReused for a second patient's drawBLeft at room temperature overnightCLabeled and stored per protocolDLeft unlabeled until the run starts

16. 16. Used sharps (needles) should go into a:

    APuncture-resistant sharps containerBRecycling bin for medical plasticCLined trash can in the lab roomDSealed red biohazard bag, no rigid box

17. 17. Reagents that react with each other should be:

    AStored together to save shelf spaceBShelved in alphabetical order by nameCStored apart by compatibility groupDLeft open so fumes can escape

18. 18. A reagent label reads: store at 2 to 8 degrees C, protect from light. Where does that bottle belong?

    AIn the refrigerator, in its amber bottleBIn a dark cabinet at room temperatureCIn the refrigerator, in a clear working bottleDIn the freezer, still in its amber bottle

19. 19. A blood tube reaches the bench with nothing written on it. You:

    AWrite the name from the request slip on itBGive it the name of whoever has no tube yetCHold the run until a second tube is collectedDRun it now and hold the report until a name shows up

20. 20. A protocol says to make 100 mL of working stain by mixing one part stock with nine parts water. You measure:

    A10 mL of stock and 100 mL of waterB10 mL of stock and 90 mL of waterC1 mL of stock and 9 mL of waterD90 mL of stock and 10 mL of water

21. 21. You finish a dissection. Your gloves are soiled, and you still have goggles and an apron on. You take off:

    AThe apron, folded with the dirty side inBThe goggles, so you can see what you are doingCThe goggles and apron together, then glovesDThe gloves, before you touch anything else

22. 22. You are setting up a test and the reagent bottle expired last month. You:

    AUse it, and note the old date in your resultsBUse it, since the bottle is still sealedCSet it aside and open an in-date bottleDUse half, and check it against a control

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