Which of the following cello cannot replicate in response to a specific antigen

Question

Which of the following cello cannot replicate in response to a specific antigen a. B cells b. Cytotoxic T cells c. Helper T cells d. plasma cells Which technique is used to separate DNA molecules a. cloning b. gel electrophoresis c. ligation d. restriction In recombinant DNA technology, ___ is used to seal a gap in a DNA molecule a. ligase b. DNA polymerase c. an endonuclease d. amylase Resistance to many antibiotics is carried on a. R factor plasmids b. sex pili c. chromosomes d. A factor plasmids Repair mechanisms that occur during DNA synthesis are mismatch repair proofreading by DNA polymerase light repair SOS repair excision repair a. 1 and 2 b. 2 and 3 c. 3 and 4 d. 4 and 5 Thymine dimer formation is the result of exposing DNA to a. UV light b. base analogs c. transposons d. X-rays e. intercalating agents Which of the following processes does not result in recombination a. transformation b. conjugation c. transduction d. replication Plasmids and viruses are the most common vectors used for gene cloning. a. true b. false

Explanation / Answer

45. d.plasma cells

Reason:Plasma cells do not replicate in response to antigen.

46. b.gel electrophoresis

Reason: agarose gel electrophoresis separates DNA.

47. a.ligase

Reason: Ligase is the enzyne that seals the gap.

48. a. R factor plamids

Reason: Resistance transfer plasmids or R factor plasmids is correct.

49. a. 1 and 2

Reason: During DNA synthesis, proof reading and mismatch repair work well.

50. a.UV light

Reason: UV light results in formation of thymine dimers.

51.d.replication

Reason:Replication has no recombination.

52.true

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