Identify the incorrect statement/s from the following with respect to DNA.
A
Adenine and cytosine are purines.
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
Nitrogenous bases are joined by hydrogen bonds.
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
DNA is made up of sugar and phosphate molecules only.
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
Adenine always pairs with guanine.
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution
The correct options are A Adenine and cytosine are purines. C DNA is made up of sugar and phosphate molecules only. D Adenine always pairs with guanine.
DNA is made up of a sugar-phosphate backbone and four types of nitrogenous bases - adenine, thymine, guanine and cytosine.
Adenine and guanine are called purines, while cytosine and thymine are called pyrimidines.
Adenine always pairs with thymine and cytosine with guanine, via hydrogen bonding.