Question

Which is the most abundant protein on earth?
A. Lignin
B. Rubisco
C. Cellulose
D. Pectin

Answer 1

The abundant proteins are the one which are present in abundant composition in our environment and are required majorly to convert the raw form into some valuable form required for plants and human beings.

Complete step by step answer: Now we will discuss about the role of each given option and will found about the abundant protein on earth:
Lignin: Lignin is a complex organic polymer that forms the material that provides structural support to tissues of some algae and vascular plants. They have their important role in the formation of cell walls in hard woody and barky plants. Its location is in the secondary cell wall of xylem vessels and mostly is found in the middle lamella, and in the strength providing fibres in plants. It plays an important role in certain biological functions such as providing mechanical support, transportation of water and resistance against various stress conditions for plants.
Rubisco: It stands for Ribulose-1, 5-bisphosphate carboxylase or oxygenase, it is the most abundant enzyme found on earth and is involved in carbon fixation reaction by which plants convert the carbon from the atmosphere into their food sources such as glucose by the process of photosynthesis.
Cellulose: It is an abundant carbohydrate which is found in nature. The cellulose digesting property is not present in humans due to the lack of enzyme cellulose. The cellulose is the polymer of glucose molecules which are prepared by the process of photosynthesis in plants. It is the main constituent of the cell wall of plants and helps to maintain its shape and provide rigidness to it.
Pectin is the soluble sugar also known as polysaccharide and is found in fruits and vegetables as fibres. It is used in making items where the composition is to be thick like in manufacturing of jellies and jams.
Thus the correct option is B, it is only protein rest others are carbohy.

Note: Proteins are regarded as the building block of life because organisms require certain proteins for the proper functioning of the body. The deficiency of certain proteins in the body can lead to a diseased state.