Question

Animal cytoplasm is composed of
A. Proteins
B. Salt
C. Nucleotides
D. All of the above

Answer 1

All organisms are composed of cells. Cells are the compartment-like structures that make the whole body of a living organism. In some organisms only a single cell performs all the biological activities, these are called unicellular organisms while in some organisms many cells are grouped to perform all the essential biological activities, these are called multicellular organisms.

Complete answer:
The cells have a well-defined boundary called the cell membrane. The cell membrane surrounds a fluid in the cell, called cytoplasm. The cytoplasm is a watery fluid that is present inside the cell and provides the cell with a characteristic framework. The cytoplasm is found in all the cells. It is very essential for a cell because it is the main area of cellular activities in every cell. Various essential and non-essential chemical reactions occur in the cytoplasm to keep the cell in the living state.
Water (major solvent) is present in a maximum amount in the cytoplasm and all other elements are its solutes. Several types of salts are also present in the cytoplasm. Some are found in free ionic states (like zinc, copper) and some are found in bounded states forming salt linkages.
Proteins are the second major component of the cytoplasm after water. These are present to provide the structural framework to the cell. Nucleotides are found in the cytoplasm in minute quantities but these are the essential component of cell cytoplasm.
Thus the correct answer is option D.

Note: The cytoplasm is a semi-fluid matrix occupying the volume of the cell. It contains both organic and inorganic elements. All living organisms are made up of the same elements and compounds. Living organisms produce thousands of organic compounds (biomolecules) and inorganic compounds (ash), all these are required for their basic or primary metabolic processes.