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

Part A

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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