mi 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 main purpose of PCR is to:

   ACut DNA at a specific recognition siteBSeparate DNA fragments by sizeCRead the order of bases in a DNA strandDMake many copies of one DNA region

2. 2. On a DNA gel, the fragments that travel farthest are the:

   ABrightest, thickest bandsBMost negatively charged fragmentsCSmallest fragmentsDLargest fragments

3. 3. An ELISA that calls a healthy person positive has produced a:

   AFalse negativeBFalse positiveCTrue positiveDTrue negative

4. 4. A bright spot on a gene-expression microarray means that gene is:

   AMutated in the sampleBTurned off in the sampleCDuplicated in the sample's genomeDHighly expressed in the sample

5. 5. In gene therapy, a viral vector is used to:

   ADeliver a working gene into cellsBCut the faulty gene out of the DNACRead the patient's DNA sequenceDGive the patient an active viral infection

6. 6. A SNP is a:

   ADifference at a single DNA baseBPiece of DNA that codes for one proteinCShort repeat of bases used in DNA fingerprintingDMissing copy of a chromosome

7. 7. A tumor suppressor gene normally:

   ACopies DNA before the cell dividesBBlocks apoptosis in damaged cellsCPuts the brakes on the cell cycleDSpeeds up uncontrolled division

8. 8. Leaving a culture plate uncovered on the bench most likely causes:

   ASterilization by the room's lightBNo change, since the agar is sterileCContamination by airborne microbesDFaster growth from the extra oxygen

9. 9. A larger clear zone around an antibiotic disk means the bacteria are:

   AMore resistant to itBUnable to grow anywhere on the plateCContaminated with another speciesDMore susceptible to it

10. 10. Before handling a new reagent, you should first check its:

    ASafety Data Sheet (SDS)BMolecular weight on the labelCExpiration date on the bottleDHazard color code on the label

11. 11. Three sequential 1:10 dilutions give a final dilution of:

    A1:10000B1:30C1:100D1:1000

12. 12. An outbreak line list has one row per:

    ADay, with the new case countBCase, with onset and exposuresCSymptom, with how many reported itDLab test, with its result

Enter your Student ID to submit.