pbs Benchmark 1

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. The mRNA codon AUG signals:

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

4. 4. Two unaffected parents have an affected child. The trait is most likely:

   AA new mutationBEnvironmentalCRecessiveDDominant

5. 5. Three copies of chromosome 21 indicates:

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

6. 6. A differential diagnosis is:

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

7. 7. A fasting blood glucose far above normal most suggests:

   ARisk of sickle cell diseaseBRisk of anemiaCRisk of lead poisoningDRisk of diabetes

8. 8. An epidemic curve plots:

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

9. 9. 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

10. 10. 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

11. 11. The best routine way to prevent hospital-acquired infection is:

    AHand hygiene between patientsBPreventive antibiotics for admitted patientsCGloves worn in place of handwashingDDisinfecting floors instead of hands

12. 12. 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

13. 13. 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

14. 14. A leftover stain is labeled toxic to aquatic life. The class is done with it. Where does the stain go?

    AInto the waste bin after the chemical driesBDown the drain with the water runningCInto the chemical waste bin held for pickupDInto the labeled biohazard bag with the gloves

15. 15. 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

16. 16. 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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