The correct answer is (1) \(\alpha\)-keratin.
- \(\alpha\)-keratin is a fibrous protein that is found in hair, nails, and skin. It is insoluble in water because of its high content of hydrophobic amino acids, such as alanine, valine, and leucine.
- Haemoglobin is a globular protein that is found in red blood cells. It is soluble in water because of its high content of hydrophilic amino acids, such as arginine, lysine, and histidine.
- Ribonuclease is an enzyme that breaks down RNA. It is soluble in water because of its high content of polar amino acids, such as aspartic acid, glutamic acid, and serine.
- Adenine is a nucleotide that is found in DNA and RNA. It is soluble in water because of its polar nature.
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