amino acid is to protein as
fat is to lipid
DNA is to RNA
sugar is to fat
simple sugar is to starch
To find the analogy between amino acid and protein, we need to understand the relationship between them. An amino acid is a building block of protein. These small molecules join together through chemical reactions to form long chains known as proteins.
Using this understanding, let's evaluate the given options:
1. Fat is to lipid: This analogy is correct. Just as amino acids are the building blocks of proteins, fats are the building blocks of lipids. Lipids are larger molecules that include fats, phospholipids, and steroids.
2. DNA is to RNA: This analogy is correct. DNA and RNA are both nucleic acids, with DNA serving as the primary material of genetic information in most organisms, while RNA serves as a messenger that helps in protein synthesis.
3. Sugar is to fat: This analogy is incorrect. Sugar and fat are both types of dietary components but do not share the same relationship as amino acid and protein.
4. Simple sugar is to starch: This analogy is correct. Just as amino acids are joined together to form proteins, simple sugars (monosaccharides) are linked together to form larger molecules known as polysaccharides, such as starch.
So, the correct analogy is: simple sugar is to starch.