What is the basic functional and structural unit of organisms?
A.
Nucleus
B.
DNA
C.
Cell
D.
Gene
Answer: Option C
Explanation:
Cell is the basic structural and functional unit of life. It is a compartment filled with an aqueous solution along with several organelles which perform the essential function of life and is surrounded by the cell membrane.
Name the Scientists who first discovered the cell in the piece of cork?
A.
Louis Pasteur
B.
Anton van Leeuwenhoek
C.
Robert Hooke
D.
Rudolf Virchow
Answer: Option C
Explanation:
Robert Hooke was the first scientist who discovered the cells in the piece of cork and also given the term of the cell. He published his work in his famous book, Micrographia.
Which of the following is not the part of modern cell theory?
A.
All living things are made up of one or more cells
B.
The cell is a functional and structural unit of life
C.
Energy flow takes place within the cell
D.
All cells do not have the same chemical composition
Answer: Option D
Explanation:
According to modern cell theory all cells are basically the same in chemical composition. The modern theory also states that the hereditary information passed from cell to cell.
Plasma membrane is selectively permeable as it does not allow every solute to pass through it. Hydrophobic molecules and small molecules can easily traverse the plasma membrane while large molecules and ions cannot cross the membrane without the help of transporters.
Which of the following is described by the fluid mosaic model?
A.
Nucleus
B.
Plasma membrane
C.
Endoplasmic reticulum
D.
Ribosome
Answer: Option B
Explanation:
Jonathan Singer and Garth Nicolson in 1972, proposed a fluid mosaic model for the structure and composition of the plasma membrane. This model is now accepted worldwide for the plasma membrane study.
