Question

write down the composition of DNA ? Briefly​

Answer 1

Answer :↦

• ᴛʜᴇ ᴅɴᴀ ᴍᴏʟᴇᴄᴜʟᴇ ᴄᴏɴꜱɪꜱᴛꜱ ᴏꜰ ᴛᴡᴏ ꜱᴛʀᴀɴᴅꜱ ᴛʜᴀᴛ ᴡɪɴᴅ ᴀʀᴏᴜɴᴅ ᴏɴᴇ ᴀɴᴏᴛʜᴇʀ ᴛᴏ ꜰᴏʀᴍ ᴀ ꜱʜᴀᴘᴇ ᴋɴᴏᴡɴ ᴀꜱ ᴀ ᴅᴏᴜʙʟᴇ ʜᴇʟɪx. ᴇᴀᴄʜ ꜱᴛʀᴀɴᴅ ʜᴀꜱ ᴀ ʙᴀᴄᴋʙᴏɴᴇ ᴍᴀᴅᴇ ᴏꜰ ᴀʟᴛᴇʀɴᴀᴛɪɴɢ ꜱᴜɢᴀʀ (ᴅᴇᴏxʏʀɪʙᴏꜱᴇ) ᴀɴᴅ ᴘʜᴏꜱᴘʜᴀᴛᴇ ɢʀᴏᴜᴘꜱ. ᴀᴛᴛᴀᴄʜᴇᴅ ᴛᴏ ᴇᴀᴄʜ ꜱᴜɢᴀʀ ɪꜱ ᴏɴᴇ ᴏꜰ ꜰᴏᴜʀ ʙᴀꜱᴇꜱ ↦

↦ᴀᴅᴇɴɪɴᴇ (ᴀ)

↦ᴄʏᴛᴏꜱɪɴᴇ (ᴄ)

↦ɢᴜᴀɴɪɴᴇ (ɢ)

↦ᴛʜʏᴍɪɴᴇ (ᴛ)

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Answer 2

Answer:

• DNA contains a pentose sugar, deoxyribose.
• It contains the dollowing four nitrogen bases : Purine (Adenine, Guanine) and Pyrimidine (Thymine, Cytosine).
• Phosphate groups
• The ratio of adenine to thymine and guanine to cytosine is one.
• The number of purine nucleotide is equal to the number of pyrimidine nucleotide. A+G = C+T