1. The right answer is C) carbohydrate
Lipids is not a correct answer because some like phospholipids can contain phosphorus.
IUPAC defines carbohydrates as a class of organic compounds containing a carbonyl group (aldehyde or ketone) and at least two hydroxyl groups (-OH).
They are so called because their chemical formula was based on the model Cn (H2O) p.
2. The right answer is B) protein
The structure of proteins is the amino acid composition and the three-dimensional conformation of proteins. It describes the relative position of the different atoms that make up a given protein.
Among the amino acids, 19 amino acids contain only four chemical elements: carbon, hydrogen, oxygen and nitrogen; two amino acids additionally contain a sulfur atom, and a rather rare amino acid contains a selenium atom.
3. The right answer is D) Watson and Crick
While many biologists seek to understand how DNA forms copies of itself, James Watson and Francis Crick will be interested in the shape of DNA.
At a congress in Naples, Maurice Wilkins presents the first X-ray photographs of DNA. Despite the very limited clarity of the photo, it is the regular structure of DNA that challenges James Watson ...
The photograph of Rosalind Franklin's X-ray DNA shows that this macromolecule is cross-shaped. After a year and a half of team research, Crick and Watson finally understand that this form of cross reveals that DNA is a double helix.
