Question 21
Chromosomes, DNA and Sex LinkageUse the diagram of the double helix to answer: The part labelled I represents the
- A.base pairs
- B.ribose sugar
- C.phosphate linkage
- D.deoxyribose sugar
Show the answer and explanation
Answer: A (base pairs)
Explanation
I points to a rung across the middle of the helix. The rungs are pairs of bases (A–T and C–G) holding the two strands together.