Question

Restriction enzymes are a.) bacterial enzymes that elongate DNA b.) viral enzymes that destroy host DNA c.) bacterial enzymes that destroy incoming foreign DNA d.) animal enzymes that splice RNA Mice that are injected with only the R strain of Streptococcus pneumoniae a.) become sick and then recover b.) stay healthy, this is a non-virulent strain c.) are killed, this is the virulent strain Mice that are injected with only the S strain of Streptococcus pneumonia a.) become sick and then recover b.) stay healthy, this is a non-virulent strain c.) are killed, this is the virulent strain The previous two questions are part of which experiment a.) Griffiths b.) Avery, McCarty and MacLeod C.) Hershey-Chase When DNAse is added to a culture of heat killed bacteria and then that heat killed bacteria culture is mixed with a culture of living bacterial cells, what will happen? a.) Transformation b.) No transformation When RNAse is added to a culture of heat killed bacteria and then that heat killed bacteria is mixed with a culture of living bacterial cells, what will happen? a.) Transformation b.) No transformation The previous two questions are part of which experiment a.) Griffiths b.) Avery, McCarty and Macleod c.) Hershey-Chase Phages are viruses that infect bacterial cells, what component of a phage infects? a.) RNA b.) Proteins c.) DNA When the radioactive component was found in the cell pellet and not the supernatant, what did it indicate? a.) DNA enters the cell b.) Protein enters the cell c.) RNA enters the cell The previous two questions are part of which experiment a.) Griffiths b.) Avery, McCarty and Macleod c.) Hershey-Chase

Need help with number 1,5,6,7 and 8 please

Answer 1

1. Correct answer:- (c) bacterial enzymes that destroy incoming foreign DNA.
Explanation:- Restrictions enzymes are produced chiefly by certain bacteria, that has the property of cleaving DNA molecules at or near a specific sequence of bases.

5. Correct answer:- (b) No transformation
Explanation:- When DNAase is added to the mixture,it will destroy the DNA of the strain and there will be no transformation.

6. Correct answer:- (a) Transformation
Explanation:- When RNAase is added to the mixture,it will not destroy the DNA of the strain( RNAase will cleavage the RNA) and there will be transformation.

7. Correct answer:- (a) Griffths experiment

8. Correct answer:- (c) DNA
Explanation:- infective material of a bacteriophage is genetic material DNA.