OBJECTIVE LIFE SCIENCE
MOLECULAR BIOLOGY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Unwinding of the double helix by helicase during DNA replication
|
|
|
Separation of sister chromatids to opposite poles during mitosis
|
|
|
Transcription into complementary RNA for protein synthesis
|
|
|
Complementary base pair matching during DNA replication
|
|
|
Conservation of DNA by the enzyme sequenceconservertase
|
Detailed explanation-1: -In a round of replication, each of the two strands of DNA is used as a template for the formation of a complementary DNA strand. The original strands therefore remain intact through many cell generations.
Detailed explanation-2: -Replication relies on complementary base pairing, that is the principle explained by Chargaff’s rules: adenine (A) always bonds with thymine (T) and cytosine (C) always bonds with guanine (G).
Detailed explanation-3: -Complementary base pairing Complementary base-pairing ensures that DNA strands are copied accurately, with just a few errors for each round of replication. Forces between neighboring nucleotides stack the bases on top of one another and twist the DNA strands into a double-helix.
Detailed explanation-4: -Under normal circumstances, the nitrogen-containing bases adenine (A) and thymine (T) pair together, and cytosine (C) and guanine (G) pair together. The binding of these base pairs forms the structure of DNA .