Chemistry - Biomolecules Question with Solution | TestHub
How many statement(s) is/are correct about nucleic acids.
(i) Synthesis of nucleic acid is from 5' end to 3' end during replication or transcription.
(ii) DNA contains adenine, thymine, guanine and cytosine nitrogenous base and ribose pentose sugar.
(iii) RNA contains adenine uracil, guanine and cytosine nitrogenous base and ribose pentose sugar.
(iv) Secondary structure of DNA is double Helix structure which has hydrogen bonds.
(v) RNA exist as single strand.
(vi) r-RNA is the structural part of ribosome.
(vii) -helix and -pleated sheet are secondary structure of DNA.
Answer:
Solution:
Solution:
Statements (i), (iii), (iv), (v), and (vi) are correct.
Explanation:
(i) Nucleic acid synthesis (replication and transcription) always proceeds in the 5' to 3' direction.
(ii) DNA contains deoxyribose sugar, not ribose.
(iii) RNA contains adenine, uracil, guanine, cytosine, and ribose sugar. This statement is correct.
(iv) The secondary structure of DNA is a double helix stabilized by hydrogen bonds. This statement is correct.
(v) RNA typically exists as a single strand, though it can fold into complex 3D structures. This statement is correct.
(vi) Ribosomal RNA (rRNA) is a major structural and catalytic component of ribosomes. This statement is correct.
(vii) -helix and -pleated sheets are secondary structures of proteins, not DNA.