Which is the palindromic nucleotide sequence ?
`{:((i) "GAATTC",(ii) "AGGCCT",(iii) "CAGTCG"),(" CTTAAG"," TCCGGA"," GTCAGC"):}`

Options

A. i, ii and iii
B. i, and ii
C. i only
D. i and ii

Explanation

To determine which of the given nucleotide sequences is palindromic, we need to analyze each option. A palindromic nucleotide sequence is one that reads the same in both directions (5' to 3' and 3' to 5').

### Step-by-Step Solution:

1. **Identify the Sequences**:
The sequences provided are:
- (i) "GAATTC"
- (ii) "AGGCCT"
- (iii) "CAGTCG"

2. **Check Each Sequence for Palindrome**:
- **For (i) "GAATTC"**:
- Read from 5' to 3': GAATTC
- Read from 3' to 5': CTTAAG
- Since GAATTC and CTTAAG are complementary and reverse of each other, "GAATTC" is a palindromic sequence.

- **For (ii) "AGGCCT"**:
- Read from 5' to 3': AGGCCT
- Read from 3' to 5': TCCGGA
- Since AGGCCT and TCCGGA are complementary and reverse of each other, "AGGCCT" is also a palindromic sequence.

- **For (iii) "CAGTCG"**:
- Read from 5' to 3': CAGTCG
- Read from 3' to 5': CGTACT
- Since CAGTCG and CGTACT are not the same, "CAGTCG" is not a palindromic sequence.

3. **Conclusion**:
The palindromic nucleotide sequences among the options are:
- (i) "GAATTC"
- (ii) "AGGCCT"

### Final Answer:
The palindromic nucleotide sequences are (i) "GAATTC" and (ii) "AGGCCT".

---