Revision Exercise Form 4 Biology

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Tick (v) if it is a true statement.
Chapter 2 Cell Structure and Cell Organisation
1. The cell is the basic unit of life for all organisms.
2. All cells have the same shape and size.
3. All cells have a plasma membrane, nucleus and cytoplasm.
4. Protoplasm consists of a plasma membrane and nucleus.
5. The nucleus consists of chromosomes and a nucleolus.
6. Organelles that are found in the cytoplasm of a cell include the nucleus, vacuole, endoplasmic reticulum, mitochondria and Golgi apparatus.
7. The vacuole of a plant cell is enclosed by the tonoplast.
8. Human cheek cells and epidermal cells of onions do not have chloroplasts.
9. Epidermal cells of onions have big vacuoles.
10. Cells wall and plasma membranes are fully permeable.
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21. The movement of substances across the plasma membrane is important for the survival of cells.
22. Substances move across the plasma membrane in a continuous and orderly manner.
23. The rate of the movement of substances across the plasma membrane depends on the presence of unsaturated phospholipid bilayers and cholesterol on the membrane as well as the surrounding temperature.
24. The cholesterol on the plasma membrane increases the permeability of the membrane.
25. At high temperature, the permeability of the plasma membrane increases.
Chapter 4 Chemical Composition of the Cell
1. The main elements in a cell are oxygen, carbon, hydrogen and nitrogen. 2. Inorganic compounds are chemical compounds which contain carbon.
3. The main organic compounds in cell are carbohydrates, lipids, proteins and nucleic acids.
4. Carbohydrates provide energy for the cells.
5. The cell wall is made up of cellulose.
6. The main function of lipids is to provide energy.
7. Protein is used to form the phospholipid bilayer of the plasma membrane.
8. Nucleic acids contain genetic information to control all the activities of the cell.
9. Nucleic acids carry genetic information for synthesis of proteins.
10. Water is the main component of protoplasm.
11. Carbohydrates consist of monosaccharide, disaccharides and polysaccharides.
12. Examples of disaccharides are maltose, glucose and lactose.
13. Wholemeal bread consists of carbohydrate in the form of starch and cereals.
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