Question

Choose the ONE best answer 1. For solution/sample storage, you must label all containers with A. Name of the chemicals 2. You used Fume Hood to: A. Handle chloroform B. Homogenize C.Fiter using cheesecloth D.A 3. The least resistant type of organism/ pathogen include: A. Enveloped virus B. Bacteria C. Fungi D. Spore 4. The most resistant type of organism/ pathogen include: A. Enveloped virus B. Bacteria C. Fungi D.Spore 5. For the disposal of hazardous chemicals you will use B. Concentration C. Date& initials A. Autoclave bags 6. Using exponential numbers, 1000 can be represented as. A 10, B. 10 C 10 D. 10, 7. Using exponential numbers, 0.001 can be represented as A. 10- B.10, С.1P D. 10 8. The presence of DNA in the extracted sample and its concentraion can be determined by 9. DNA was extracted from: A. Onion B. Bacterial 10. The reading at 280 nm gives the amount of which in the sample? B. Sink/ sewer system C. Waste disposal container D.A ΕΊΟ- E10, B. C. PCR D. Spectrophotometry culture C. Animal tissue homogenate D. None B. Single stranded DNA C.RNA A. Double-stranded DNA 11, Pure preparations of DNA and RNA have OD26000mvalues otA0-1B.18-20 C.20-28 D. 50 12. 100 ml of homogenizing solution was mixed with 20g of sliced onion and incubated at 65 C for 15 minutes to: D.Protein D. Both A&B C. Enzymes D.B&C A. Soften onion tissues B. Denature enzymes C. Precipitate DNA E. A, B&C 13. Plant cell membranes were dissolved with: A. Buffer 14. After homogenization, the filtrate was separated with: 15. 10ml chloroform was added to 50ml filtrate for B. SDS B. Centrifugation C. Heating DB&C A. Cheesecloth A. DNA precipitation B. De-proteinization C. RNA precipitation D.A&C 16. After chloroform treatment, where was DNA present? D. Everywhere C. Interface A. Aqueous layer B. Chloroform layer 17. In DNA extraction experiment, the ethanol concentration used was: C.65% D. 35% B. 95% A 100%

Answer 1

Answer

1. Option D is the right answer all need to mention before storing the solution

2) Option A is the right answer fume hood is being used when we handle the volatile substance.

3) Option A is the right answer enveloped virus is leat resistant organism

4) Option D is the right answer

5) Option A is the right answer

6) Option C is the right answer as the exponential of 1000 can be represented as 10³

7) Option E is the right answer