Question

Choose the correct statement.
A. All proteins are formed from 20 amino acids
B. Both ends of a protein are similar
C. All proteins are soluble
D. Proteins are formed by glycosidic bonds

Answer 1

A protein is defined as a naturally occurring, extremely complex substance that consists of amino acid residues that are joined by peptide bonds. Proteins are present in all living organisms and it also includes many essential biological compounds such as enzymes, hormones, and antibodies.

Complete answer:
Proteins are known to be large, complex molecules that play many major roles in the body. Most of the work in cells is done by proteins and proteins are also required for the structure, function, and regulation of the body's tissues and organs. Enzymes carry out almost all of the thousands of chemical reactions that take place in cells in our body. All proteins consist of 20 standard amino acids. The amino acids are joined with each other with the help of peptide linkage to form protein. A protein has an amino-terminal with the free amino group and the carboxy terminal with a free carboxyl group. Proteins rich in polar amino acids and that are soluble.
Protein is the very basic component of living cells and it is made of carbon, hydrogen, oxygen, nitrogen and one or more chains of amino acids. There are three types of proteins - 1.Fibrous 2.Globular
3. Membrane
Protein is taken from diet by our body and is broken down into individual amino acids which are reassembled by our ribosomes into proteins that your cells need. The information to produce a protein is encoded in the cell's DNA. When a protein is produced, a copy of the DNA is made (called mRNA) and this copy is transported to a ribosome

So, the correct option is A.

Note:
Proteins helps in deciding your body structure and is also involved in cell division for your growth, reproduction and healing. Human body contains around 100,000 different proteins that are made by the different combinations of 20 amino acids