Biology Form 4 Chapter 4 Essay Questions


SULIT 4551/2

Chapter 4 : Chemical composition in the cell


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4.1 The chemical composition in the cell  No Marking scheme Marks (a) There are two important groups of compound in the cells, the organic compound and the inorganic compounds. the organic compound are protein , nucleic acids, carbohydrates and lipid s. describe the presence and importance of organic compound , such as carbohydrate and protein in a cells. Carbohydrate P1-It is a compound synthesized by plants through photosynthesis P2-It is involved in the building of plant cell wall P3-It is present in various forms including monosacharide, disaccharide and polysacharide P4-Polycharide is storage carbohydrate P5-Example: glycogen is storage carbohydrate Protien P1-It is the main component of cytoplasm an dplasma membrane P2-protien is present as keratin in hair and nail P3-Carier protein in the plasma membrane function in the transport of substances across the plasma membrane P4-Enzyme , antibody and many hormones are proteins P5-Hormones function to regulate chemical process and cell metabolism , such as digestion P6-Enzyme act to catalyze metabolism reaction of the cell P7-Antibody defends the body from pathogenic attack P8-Protien also act as source of energy during starvation ANY 10 1 1 1 1 1 1 1 1 1 1 1 1 1 1 10 (b) How are the carbohydrates stored in plant and animal tissues? Carbohydrate are stored as starch in glycogen and glycogen in animal tissue 1 1 (c) How are the delicate internal organs of animal protected by the lipids Lipid form the adipose tissue lining around the delicate internal organs

Protecting them from physical injure 1 1

Revision Exercise Form 4 Biology

4906 WordsJun 26th, 201320 Pages

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.
11.…show more content…

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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