The Question is from neet-botany , and it was created by the author NISHANTH

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I. Which colour glycogen gives on its reaction with iodine solution?
II. What is satellite DNA?
III. Name three components of a nucleotide molecule
Correct option will all answers is

NISHANTH · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
	**Primary Concept**: Carbohydrate Chemistry, Molecular Biology (DNA)
	**Related Topics**: Glycogen structure, DNA repetitive sequences, Nucleotide composition
	**Prerequisites**: Basic knowledge of biomolecules
## SOLUTION PATHWAY
**Given Information**:
	Three sub-questions related to glycogen, satellite DNA, and nucleotides.
**Method & Steps**:
	1. **Glycogen and Iodine**: Glycogen reacts with iodine to produce a reddish-brown color. This is a common test for the presence of glycogen.
	2. **Satellite DNA**: Satellite DNA is a type of highly repetitive DNA sequence found in the heterochromatin regions of chromosomes, particularly near centromeres and telomeres.
	3. **Nucleotide Components**: A nucleotide consists of three main components: a nitrogenous base (purine or pyrimidine), a pentose sugar (deoxyribose in DNA and ribose in RNA), and a phosphate group.
## OPTION ANALYSIS
[A] ✓: 'Reddish-brown; Highly repetitive DNA; Nitrogenous base, pentose sugar, phosphate group': This option correctly describes the color of glycogen with iodine, the nature of satellite DNA, and the components of a nucleotide.
[B] :x: 'Blue-black; Non-repetitive DNA; Amino acid, hexose sugar, phosphate group': Iodine gives a blue-black color with starch, not glycogen. Satellite DNA is highly repetitive, not non-repetitive. Nucleotides contain nitrogenous bases and pentose sugars, not amino acids and hexose sugars.
[C] :x: 'Yellow; Moderately repetitive DNA; Nitrogenous base, triose sugar, sulphate group': Glycogen with iodine doesn't produce a yellow color. Satellite DNA is highly repetitive, not moderately repetitive. Nucleotides contain pentose sugars and phosphate groups, not triose sugars and sulphate groups.
[D] :x: 'Violet; Unique DNA; Amino acid, pentose sugar, phosphate group': Glycogen doesn't give a violet color with iodine. Satellite DNA is repetitive, not unique. Nucleotides contain nitrogenous bases, not amino acids.
## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing the iodine test for glycogen with the iodine test for starch: Starch gives a blue-black color with iodine, while glycogen gives a reddish-brown color.
		2. Misunderstanding the nature of satellite DNA: It's crucial to remember that satellite DNA is highly repetitive.
	**Quick Tips**:
		1. Remember the color mnemonic: 'Reddish-brown for glycogen, blue-black for starch'.
		2. Associate satellite DNA with 'highly repetitive' sequences.

NISHANTH · Answer

The correct Option is "Reddish-brown; Highly repetitive DNA; Nitrogenous base, pentose sugar, phosphate group"

NISHANTH · Answer

Blue-black; Non-repetitive DNA; Amino acid, hexose sugar, phosphate group

NISHANTH · Answer

Yellow; Moderately repetitive DNA; Nitrogenous base, triose sugar, sulphate group

NISHANTH · Answer

Violet; Unique DNA; Amino acid, pentose sugar, phosphate group

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