Tag: dna replication

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Questions Related to dna replication

Multiple choice dna replication replication and protein synthesis nucleic acids and protein synthesis heredity biology

DNA polymerase enzyme is required for the synthesis of 

  1. RNA from DNA

  2. DNA from DNA

  3. RNA from RNA

  4. DNA from RNA
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

DNA polymerase is an enzyme that synthesizes DNA molecules from deoxynucleotides, the building blocks of DNA. It helps in DNA replication (DNA dependent DNA synthesis). This enzyme works in pairs to create two complementary DNA strands from a single original DNA molecule.

RNA from DNA (transcription) is synthesized by RNA polymerase.
DNA from RNA is synthesized by reverse transcriptase enzyme in some viruses.
So, the correct option is 'DNA from DNA'.

Multiple choice dna replication replication and protein synthesis nucleic acids and protein synthesis heredity biology

The area of unwinding and separation of DNA strands during replication is called

  1. Origin

  2. Initiation point

  3. Primer

  4. Replication fork
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The Y-shaped region where DNA strands unwind and separate to undergo replication is known as the replication fork. The origin is where replication begins, and primers are short RNA sequences needed to start synthesis.

Multiple choice dna replication replication and protein synthesis nucleic acids and protein synthesis heredity biology

The enzyme which can cut molecules of DNA into segments is known as

  1. DNA polymerase

  2. DNA ligase

  3. Restriction enzyme

  4. DNA gyrase
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Restriction enzymes are nick named as 'molecular scissors' due to their ability to cut DNA fragments. Thus, restriction enzymes are of great use in genetic engineering for restricting desired genes for incorporation
So, the correct answer is 'Restriction enzyme'
Multiple choice dna replication replication and protein synthesis nucleic acids and protein synthesis heredity biology

DNA replication occurs in 5' 3' direction because 

  1. DNA polymerase III can polymerise nucleotides in 5 3 direction

  2. DNA polymerase I carries out editing

  3. DNA polymerase I carries out polymerisation

  4. DNA polymerase II can link up only in 5 3 direction
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

DNA polymerase III is the primary enzyme for DNA replication and is structurally constrained to add nucleotides only in the 5' to 3' direction.

Multiple choice dna replication replication and protein synthesis nucleic acids and protein synthesis heredity biology

DNA replication is

  1. Conservative and discontinuous

  2. Semiconservative and semidiscontinuous

  3. Semiconservative and discontinuous

  4. Conservative
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

DNA replication is semiconservative, and because the two strands are antiparallel, one strand (leading) is synthesized continuously while the other (lagging) is synthesized discontinuously in Okazaki fragments.