OBJECTIVE LIFE SCIENCE
MOLECULAR BIOLOGY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
DNA=double helix, RNA=single strand
|
|
|
DNA=thymine, RNA=uracil
|
|
|
DNA=deoxyribose, RNA=ribose
|
|
|
DNA=antiparallel, RNA=parallel
|
Detailed explanation-1: -In nature, DNA and RNA exist in an antiparallel orientation, stabilized by Watson-Crick base pairs. However, in some cases, nucleic acid fragments with specific nucleotide sequences can adopt a parallel orientation involving non-canonical base pairing.
Detailed explanation-2: -DNA is made up of two strands. Each strand has a backbone made up of alternating sugars and phosphate groups. The two strands are linked by complementary nitrogenous bases. The strands are oriented in opposite directions, making the structure “antiparallel".
Detailed explanation-3: -Note: The main reason why DNA strands are antiparallel is due to the high level of stability achieved in an antiparallel configuration. DNA can also exist in parallel configuration but the base pairing will be different (reverse Watson and Crick base pairing) and stability will be less.