Polypeptides are assembled from _.
a. hexoses
b. glycerol
c. nucleotides
d. proteins
e. amino acids
The Correct Answer and Explanation is :
The correct answer is e. amino acids.
Explanation
Polypeptides are linear chains of amino acids linked together by peptide bonds. They play a crucial role in biological systems, serving as the building blocks of proteins, which are essential for various cellular functions. Each amino acid in a polypeptide is composed of a central carbon atom bonded to four distinct groups: an amino group (-NH₂), a carboxyl group (-COOH), a hydrogen atom, and a variable R group (side chain) that determines the specific properties of the amino acid.
The sequence of amino acids in a polypeptide is determined by the genetic code contained within DNA. During protein synthesis, a process called translation occurs, where messenger RNA (mRNA) is read by ribosomes to assemble a chain of amino acids in a specific order. This sequence ultimately dictates the structure and function of the resulting protein.
Polypeptides can vary in length and complexity, ranging from just a few amino acids to several thousand. The unique properties of the side chains allow for diverse interactions and folding patterns, leading to the formation of three-dimensional structures that are critical for protein function. For instance, some polypeptides fold into functional proteins, while others may serve regulatory roles or act as signaling molecules.
In summary, polypeptides are assembled exclusively from amino acids. Their synthesis and subsequent folding are fundamental processes in biochemistry, underpinning the vast array of functions that proteins perform within living organisms. Understanding the assembly of polypeptides from amino acids is crucial for fields such as molecular biology, biochemistry, and medicine, as it provides insights into protein function and the impact of mutations or modifications in amino acid sequences on health and disease.