hbs 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. Osteoblasts build bone; osteoclasts:

   AForm cartilage at a jointBBreak down bone tissueCBuild bone even fasterDMake blood cells in marrow

2. 2. A muscle shortens when:

   ACalcium leaves the cytoplasmBMyosin pulls actin toward the centerCThe Z discs move apartDThe filaments each shorten

3. 3. At a synapse, the signal crosses mainly by:

   ANeurons fusing into one cellBNeurotransmitters crossing the gapCThe myelin sheath itselfDHormones from the bloodstream

4. 4. After a meal, the pancreas releases insulin, which:

   ADigests sugar in the small intestineBLowers blood glucoseCBlocks glucose from entering cellsDRaises blood glucose

5. 5. Blood returning from the body enters the heart first at the:

   ARight atriumBLeft atriumCRight ventricleDLeft ventricle

6. 6. "Proximal" means:

   ACloser to the trunkBToward the backCFarther out on the limbDNearer the midline

7. 7. The heart and lungs sit mainly in the:

   ACranial cavityBThoracic cavityCAbdominal cavityDPelvic cavity

8. 8. Which is one of the four basic tissue types?

   ACartilageBCirculatoryCAdiposeDEpithelial

9. 9. Range of motion is measured in:

   ACentimetersBDegreesCRepetitionsDNewtons

10. 10. Steady weekly gains in range of motion suggest the rehab plan is:

    AToo demanding, so scale backBProof the injury is healedCFailing to build motionDWorking and can progress

11. 11. Each clear plaque on a cell lawn represents:

    AA zone cleared by antibioticBAn area where virus killed cellsCA colony of bacteriaDA spot of uneven stain

12. 12. A control group in a study provides:

    AA baseline for comparisonBThe changed variableCA repeat trial for reliabilityDThe group given the treatment

13. 13. An untreated plate grows 100 plaques. A plate of the same virus stock treated with a drug grows 12. This best supports the claim that:

    AThe drug killed the bacteria growing on the plateBThe drug cured the patient the sample came fromCThe drug lowered the amount of infectious virusDThe drug is 12 percent effective on this virus

14. 14. A team plates three dilutions of one phage stock. One plate is completely cleared, the next shows 62 plaques, and the most dilute shows 3. For the titer they should count:

    AThe cleared plate, where the most virus landedBThe plate with 3 plaques, the clearest to readCAll three plates, averaged into one countDThe plate with 62 plaques, counted on its own

15. 15. A gloved finger touches the agar, and the plate is closed again. The likely result is:

    ANothing grows there, since the gloves are sterileBThe spot grows the same microbe as the plateCMicrobes from the glove grow where it touchedDFlaming the loop afterward clears the spot

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