Amino acids joining together to make a peptide is a good example of a(n) reaction.
A synthesis
B exchange
C decomposition
D reversible
The correct answer and explanation is :
The correct answer is A) Synthesis.
Explanation:
The process in which amino acids join together to form a peptide is an example of a synthesis reaction. In a synthesis reaction, two or more smaller molecules (reactants) combine to form a larger, more complex molecule (product). This type of reaction is also known as an anabolic reaction, where molecules are built up.
In the context of peptides, amino acids are the building blocks, and when they come together, they form peptide bonds through a process called dehydration synthesis (or condensation reaction). In dehydration synthesis, a molecule of water is released as two amino acids are joined by a covalent bond, specifically a peptide bond. This bond is formed between the amino group (-NH₂) of one amino acid and the carboxyl group (-COOH) of another amino acid, resulting in the formation of a dipeptide (two amino acids) or longer chains, depending on how many amino acids are involved.
This is a type of synthesis reaction because it involves combining smaller molecules (amino acids) to form a larger molecule (the peptide or polypeptide). These types of reactions require energy input and are essential for constructing proteins, which are made up of long chains of amino acids.
In contrast, let’s briefly explore the other types of reactions listed:
- B) Exchange reaction: This involves the exchange of atoms or groups between molecules, but it is not involved in peptide bond formation. An example would be a double displacement reaction.
- C) Decomposition reaction: This type of reaction involves breaking down a larger molecule into smaller molecules or atoms. An example is the breakdown of a compound during digestion, but this doesn’t apply to peptide formation.
- D) Reversible reaction: This refers to reactions that can proceed in both directions. While peptide bonds can break under certain conditions, peptide formation is typically a one-way process under normal biological conditions, not a reversible reaction.
Therefore, the joining of amino acids to form peptides is best described by a synthesis reaction.