1st Year Biology Chapter 4 Notes

• Our comprehensive 1st Year Biology Chapter 4 Notes will ensure you're fully prepared for your exams.
• 1. The digestive vacuoles and autophagosomes are also called: (a) Endoocytosis (b) All of these (c) Primary Lysosomes (d) Secondary Lysosomes
• 2. The digestive vacuoles and autophagosomes are also called: (a) Golgi complex (b) Plastids (c) Lysosome (d) Mitochondria
• 3. Tay - sach's disease is because of the absence of enzyme involved in catabolism of: (a) Glycogen (b) Nucleic acid (c) Lipids (d) Protein
• 4. The lysosomes which eat parts of its own cell are known as: (a) Primary Lysosome (b) Secondary Lysosomes (c) Phagocytic Lysosome (d) Autophagosomes 
• 5. In the disease glycogenosis Type II , glycogen fills the liver and: (a) Kidneys (b) Muscles (c) Lungs (d) Pancreas
• 6. Vacuoles are present …… in. (a) None of these (b) Plant cell (c) Both D& B (d) Animal cell 
• 7. Vacuoles serve to expand the plant cell without diluting its: (a) Cell wall (b) Cell membrane (c) Cytoplasm (d) Both A & B 
• 8. Vacuoles functions as sites for the storage of ……….. and cell products or metabolic intermediates: (a) Food (b) None of these (c)  Waste of cell (d) Water
• 9. The plant vacuole is the major contributor to the……….. . (a) None of these (b) Turgor (c) Diffusion (d) Active transport
• 10. What is not true for microtubules? (a) Cilia are derived from them (b) Play role in spindle formation (c) Branched (d) Formed of tubulin.
• The protein present in microtubule is: (a) Tropomysin (b) Tetroses (c) Tetroses (d) Tubulin
• 12. Cilia , flagella and centrioles are special assemblies of:  (a) Microfilaments (b) Microfibers (c) Microtubules (d) Intermediate filaments
• Cyclosis and amoeboid movements are because of: (a) Intermediate filaments (b) Microfibers (c) Microfilaments (d) Microtubules
• When cross - section of centriole is observed it shows as it consists of:  (a) 6 - microtubules (b) 9 - microtubules (c) 11 - microtubules (d) 3 - microtubules
• State salient features of cell theory. Ans: The salient features of cell theory are:  All organisms are composed of one or more cells.  All cells arise from pre-existing cells.  Cell is the basic structural as well as functional unit for all organisms.
• What is the chemical composition of plasma membrane? Ans: Cell membrane is chemically composed of lipids and proteins, 60-80% are protein, while 20-40% are lipids. In addition there is a small quantity of carbohydrates. 
• Cell Secretions: Class 11th www.pakcity.org : Biology notes  Golgi complex is concerned with cell secretions. Secretions are products formed within the cell on ribosomes and then passed to the outside through endoplasmic reticulum and Golgi apparatus. The secretions are converted into finished products and are packed inside membrane, before export. Exp: In mammals, the secrete granules containing enzymes that help in digestion. The Golgi complex has a role in information of these granules.
• What are storage disease? Ans: Several congenital disease have been found to be due to accumulation within the cell of substances such as glycogen or various glycolipids. These are also called storage disease and are produced by a mutation that effect one of the lysosomal enzymes involved in the catabolism of a certain substance.
• Briefly describe the structure of peroxisomes. Ans: These are single membrane enclosed endoplasmic organelle found both in animal and plants cells. These are characterized by containing H2O2 producing oxidases and catalase. They are approximately 0.5 micro meter in diameter. They have also been found in protozoa, yeast and many cell types of higher plants.