Question

Which of the following statements are correct for pyrimidine deoxyribonucleotides?
A. Nitrogen 1 (N1) of a pyrimidine base is attached to C1' of D-ribose present in the pyrimidine deoxyribonucleotides
B. C5 of a pyrimidine deoxyribonucleosides may attach to one or more phosphate group
C. Base present in pyrimidine deoxyribonucleotide is always complementary to a purine base present in a double-stranded DNA
D. Pyrimidine deoxyribonucleotides are joined together through a phosphodiester bond to form DNA strand
Choose the correct answer from the options given below:

• A. A, B and D only
• B. B, C and D only
• C. A, C and D only
• D. A, B and C only

Hint:

Pyrimidines: cytosine, thymine.
Purines: adenine, guanine.
Phosphodiester bond links nucleotides.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Pyrimidine deoxyribonucleotides are components of DNA.
They have specific structural features.

Step 2: Key Formula or Approach:
No specific formula.
Need to understand nucleotide structure.

Step 3: Detailed Explanation:
A. N1 of pyrimidine is attached to C1' of deoxyribose - correct.
B. C5 of pyrimidine does not attach to phosphate groups.
Phosphates attach to the sugar (C5' of deoxyribose) - incorrect.
C. Pyrimidine bases pair with purine bases in DNA - correct.
D. Nucleotides are joined by phosphodiester bonds - correct.
Thus, A, C, and D are correct.

Step 4: Final Answer:
The correct statements are A, C, and D.
Hence, the correct option is (C).