4. Draw the diagram of an animal cell and label the following: (5)
a) Factory of ribosomes b) Waste disposal system of the cell
c) power house of the cell
d) control centre of the cell
Answers
Answer:
a) Nucleolus: The ribosome factory. The nucleolus is a nuclear compartment and represents the most obvious and clearly differentiated nuclear structure seen in the microscope. Within nucleoli most events of ribosome biogenesis, such as ribosomal RNA synthesis, processing, and ribosome subunit assembly, take place.
b) Lysosomes are a kind of waste disposal system of the cell. They help to keep the cell clean by digesting any foreign material as well as worn-out cell organelles.
c) Mitochondria are tiny organelles inside cells that are involved in releasing energy from food. This process is known as cellular respiration. It is for this reason that mitochondria are often referred to as the powerhouses of the cell.
d) NUCLEUS IS CALLED CONTROL CENTRE OF THE CELL BECAUSE IT PERFORMS TWO MAIN PRINCIPAL FUNCTIONS: 1. Contains genetic information for structure, reproduction , development, metabolism and behaviour. ... Controls cellular activities through directing synthesis of particular proteins and enzymes.