Question

Which of the following elements are present in all proteins?
1.Carbon
2.Hydrogen
3.Oxygen
4.Nitrogen
Select the correct answer from the codes given below.
(a)2 and 3
(b)1,2 and 3
(c)1,3 and 4
(d)1,2,3 and 4

Answer 1

Hint: Proteins are large macromolecules that contain one or more long chains of amino acids. They function within organisms which include DNA replication, metabolic reactions, transporting molecules and providing structure to the cells.

Complete answer:
Protein consists of carbon, hydrogen, Oxygen and nitrogen elements. proteins are the substances which are present in all living organisms and have great nutritional value. The molecules of protein are large as compared to that of sugar or salt and consist of amino acids which are joined together to form long chains. Protein constitutes 20 different amino acids and makes a correlation between structure and function that can attribute the properties of amino acid. Some major classes of hormones are the proteins which include peptides and modified amino acids which are hydrophilic and mostly large. It manages fluid balance and also maintains proper pH.

Additional Information: Carbon: It has a unique diversity of organic compounds and is the 15th most abundant organic compound found in the earth's crust. Carbon has atoms that can bond together forming various allotropes of carbon. Diamond, graphite and buckminsterfullerene are some allotropes which are best known for carbon. Graphite is soft which is used to make a streak on paper, diamond is the hardest naturally occurring material and has low electrical conductivity whereas graphite is a good electrical conductor. All allotropes of carbon are solid under normal conditions but graphite is thermodynamically stable at standard temperature and pressure.
Hydrogen: It is a chemical element with atomic number 1 and up is the lightest element in the periodic table. It constitutes 75% of the baryonic mass and is a colourless, tasteless, odourless and flammable gases substance.
Oxygen: Oxygen is highly reactive non-metal which is an oxidizing agent that forms oxides with most elements and compounds. It gets replenished by photosynthesis in Earth’s atmosphere which uses sunlight to produce oxygen from water and carbon dioxide. It is chemically reactive to remain a free element in the air. Ozone is an allotrope of oxygen that absorbs ultraviolet UV B radiation and the ozone layer which protects the biosphere from ultraviolet radiation.
Nitrogen: Nitrogen is the lightest member of group 15 of the periodic table and is a colourless and odorless diatomic gas. It occurs in all organisms as in amino acids, nucleic acids and in the adenosine triphosphate which is the energy transfer molecule.
So, the correct answer is '1,2,3 and 4’.

Note: Our body does not require proteins, it requires amino acids which make up dietary protein. Oxygen constitutes two-third of the mass of the human body. Oxygen is responsible for the bright green, red and yellow-green colours of the aurora.