Question

In: Biology

Short segments of newly synthesized DNA are joined into a continuous strand by _____.

Part A

Short segments of newly synthesized DNA are joined into a continuous strand by _____.

  • DNA polymerase
  • single-strand binding protein
  • ligase
  • helicase
  • primase 


Part B

After DNA replication is completed, _____.

  • each of the four DNA strands consists of some old strand parts and some new strand parts
  • one DNA double helix consists of two old strands and one DNA double helix consists of two new strands
  • there are four double helices
  • each new DNA double helix consists of two new strands
  • each new DNA double helix consists of one old DNA strand and one new DNA strand

 

Part C

The first step in the replication of DNA is catalyzed by  _____.

  • primase
  • single-strand binding protein
  • ligase
  • helicase
  • DNA polymerase

 

Part D

The action of helicase creates _____.

  • primers and DNA fragments
  • DNA fragments and replication forks
  • replication forks and replication bubbles
  • primers and replication bubbles
  • DNA fragments and replication bubbles

 

Part E

Why is the new DNA strand complementary to the 3 to 5 strands assembled in short segments?

  • only short DNA sequences can extend off the RNA primers
  • DNA polymerase can assemble DNA only in the 5' t3' direction
  • it is more efficient than assembling complete new strands
  • the replication forks block the formation of longer strands
  • DNA polymerase can assemble DNA only in the 3 t5 direction

Solutions

Expert Solution

Ans. A ligase

it is an enzyme that repairs the DNA and helps in joining the DNA strand, which is newly formed.

Ans. B each new DNA double helix consists of one old DNA strand and one new DNA strand

in replication, the old DNA strand acts as a template strand for the synthesis of a new DNA strand, which is complementary with the old DNA strand, resulting in a new double helix DNA structure with a new and old strand.

Ans. C helicase

For replicating DNA, the double helix structure of the DNA has to unwind, for that DNA helicase helps to melt the hydrogen bonds between the strand, thus opening the structure for replication.

Ans. D replication forks and replication bubbles

the opening of DNA double helix by helicase leads to the formation of a replication fork, which is necessary to fo the replication.

Ans. E DNA polymerase can assemble DNA only in the 5' to 3' direction

DNA polymerase can read the template strand only in 3' to 5' direction, and the new strand of DNA is formed in the 5' yo 3' direction.

Dr. OWL answered 3 years ago
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