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2021-05-14

What is the DNA sequence that promotes transcription?

What is the DNA sequence that promotes transcription?

promoter Promoter sequences

What is a promoter a specific sequence of DNA nucleotides?

promoter. A specific nucleotide sequence in the DNA of a gene that binds RNA polymerase; positioning it to start transcribing RNA at the appropriate place. TATA box. A DNA sequence in eukaryotic promoters crucial in forming the transcription initiation complex. transcription unit.

Is the promoter sequence part of the DNA that is transcribed?

Is the promoter sequence part of the DNA that is transcribed? Neither the -35 nor the -10 sequences are present on the new transcript. The RNA polymerase holoenzyme binds to the promoter.

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Is TATA box a promoter?

A TATA box is a DNA sequence that indicates where a genetic sequence can be read and decoded. It is a type of promoter sequence, which specifies to other molecules where transcription begins. The TATA box is named for its conserved DNA sequence, which is most commonly TATAAA.

How do you transcribe a DNA sequence into mRNA?

During transcription, the DNA of a gene serves as a template for complementary base-pairing, and an enzyme called RNA polymerase II catalyzes the formation of a pre-mRNA molecule, which is then processed to form mature mRNA (Figure 1).

How do you replicate a DNA sequence?

DNA replication occurs through the help of several enzymes. These enzymes “unzip” DNA molecules by breaking the hydrogen bonds that hold the two strands together. Each strand then serves as a template for a new complementary strand to be created. Complementary bases attach to one another (A-T and C-G).

What is the fifth step of DNA replication?

What is the fifth step in DNA replication? The RNAse H removes primers that were made by the primase. What is the sixth step in DNA replication? The ligase links short stretches of DNA together (fills in the missing spaces).

Why is replication of DNA important?

Replication is an essential process because, whenever a cell divides, the two new daughter cells must contain the same genetic information, or DNA, as the parent cell. Once the DNA in a cell is replicated, the cell can divide into two cells, each of which has an identical copy of the original DNA.

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What is the first step of DNA replication quizlet?

The first major step for the DNA Replication to take place is the breaking of hydrogen bonds between bases of the two antiparallel strands. The unwounding of the two strands is the starting point. The splitting happens in places of the chains which are rich in A-T.

What are the enzymes needed for DNA replication?

During DNA replication, one new strand (the leading strand) is made as a continuous piece. The other (the lagging strand) is made in small pieces. DNA replication requires other enzymes in addition to DNA polymerase, including DNA primase, DNA helicase, DNA ligase, and topoisomerase.

What are the 5 enzymes involved in DNA replication?

Enzymes involved in DNA replication are:

  • Helicase (unwinds the DNA double helix)
  • Gyrase (relieves the buildup of torque during unwinding)
  • Primase (lays down RNA primers)
  • DNA polymerase III (main DNA synthesis enzyme)
  • DNA polymerase I (replaces RNA primers with DNA)
  • Ligase (fills in the gaps)

What is the difference between topoisomerase I and II?

Topoisomerase I refers to the enzymes which cut one of the two strands of double-stranded DNA, relax the strand, and reanneal the strand while topoisomerase II refers to the enzymes which cut both strands of the DNA helix simultaneously in order to manage DNA tangles and supercoils.

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What is the function of topoisomerase II?

Type II topoisomerases change DNA topology by breaking and rejoining double-stranded DNA. These enzymes can introduce or remove supercoils and can separate two DNA duplexes that are intertwined (see Figure 12-16).

What is the purpose of DNA supercoiling?

DNA supercoiling is important for DNA packaging within all cells. Because the length of DNA can be thousands of times that of a cell, packaging this genetic material into the cell or nucleus (in eukaryotes) is a difficult feat. Supercoiling of DNA reduces the space and allows for DNA to be packaged.