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The size of chlorophyll molecule is

1. Head 15 × 15 Å, tail 25 Å
2. Head 20 × 20 Å, tail 25 Å
3. Head 15 × 15 Å, tail 20 Å
4. Head 10 × 12 Å, tail 25 Å

Correct answer: Head 15 × 15 Å, tail 25 Å

Solution

Chlorophyll is commonly described with a head region about 15 × 15 Å and a phytol tail about 25 Å long. This matches the standard structural dimensions used in biology texts.

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