The following diagram shows a dipeptide with various parts of the molecule numbered (1 to 4).
Which row of the table below correctly identifies each labelled part of this dipeptide?
| 1 | 2 | 3 | 4 | |
| A. | Carboxyl group | Peptide bond | R-group | Amino group |
| B. | R-group | Amino group | Peptide bond | Carboxyl group |
| C. | Amino group | Carboxyl group | Peptide bond | R-group |
| D. | Amino group | Peptide bond | R-group | Carboxyl group |
Which of the following is not a function of proteins?
Involved in the formation of the cytoskeleton within a cell that facilitates chromosome movement
Act as a store of chemical potential energy in cells
Act as chemical messengers that are secreted by glands and act on different parts of the body
They may speed up chemical reactions within a cell
A simple tetrapeptide consists of four amino acids.
How many different combinations of amino acids would be possible for this peptide?
16 000
160 000
1 600 000
16 000 000
Which of the following are ALL examples of proteins?
Rubisco, collagen, amylopectin
Amylopectin, collagen, guanine
Insulin, amylose, spider silk
Rhodopsin, immunoglobulins, rubisco
Which of the following would represent all the elements that are present in proteins?
