27. -28- Which type of enzyme ensures template chain? ensures that the correct b

Question

27. -28- Which type of enzyme ensures template chain? ensures that the correct base for growing the chain is aligned with the a. a. gyrases b. ligases c. DNA polymerases d. primases 28 29. In PCR what temperature is needed to unwind the DNA and make it single stranded so it can hybridize with the primer? a. 25 b. 50°C 70°C c. 95 29. 20. Which of the following correctly gives the letter sequence that would replace the numbers1 -4, respectively, in the following segment of DNA? a. AGTO c. UCAG d. CTGA 3b Which of the following occurs in retroviruses? a, DNA is replicated in the 3' 5' direction b. DNA is replicated in the 5' 3' direction c. DNA is transcribed to RNA d. RNA is transcribed to DNA 31. Which of the following is involved in unwinding the DNA double helix? a. acetylase b. helicase c. binding proteins d. polymerases : Which ofthe following is true during transcription? a. Both strands of DNA serve as a template for RNA. b. Only the antisense strand of DNA serves as a template for RNA c. Only the sense strand of DNA serves as a template for RNA. d. Transcription involves merging information from both strands of DNA. 82. c. the DNA sense strand d. the DNA template strand 33 a+ which of the following has a sequence that matches that of the RNA being produced a. the DNA antisense strand b. the DNA () strand

Explanation / Answer

27) Answer C

DNA polymerase ensure that the correct base for growing the chain is aligned with the template chain.

Ligases need to join the sugar phosphate backbones of the okasaki fragments.

Primases need to binds a small stretch of RNA to existing strand of DNA called the primer.

Gyrases relieve strain of unwinding by DNA

28) Answer D

95 degrees of centigrade temperature unwind the DNA strains

29) Answer B

A combine with T & C Combine with G

30) Answer D

This viruses use their rivers transcriptase enzymes to produce DNA from their RNA genome.

31) answer B

32) Answer B

33)Answer A

DNA antisense strand is a non coding DNA strand. It use as a templete for producing mRNA that directs the synthesis of protein.

34) Answer C

The promoters are DNA sequences that define where transcription of a gene by RNA polymerase begins. Promoter sequences are typically located directly upstream or at the 5' end of the transcription initiation site.

35) Answer B

TATA is a type of promoter sequense and it is a DNA sequense that indicated where the genatic sequense can be read or decoded.

36) Answer B

37) Answer D

Here formed Peptied bonds.

38) Answer D

39) Answer B

40) Answer C

41) Answer D

42) Answer A

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