cell wall mcqs with answers and explanation ( mdcat,mcat,neet,entry test )
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CELL WALL MCQS WITH EXPLANATION (QUIZ ); CREATED BY HAFIZ BIOLOGY 1. Which of the following is the primary component of plant cell walls? a) Cellulose b) Cholesterol c) Phospholipids d) Glycogen Explanation: The correct answer is a) Cellulose. Plant cell walls are mainly composed of cellulose, a complex carbohydrate. Cellulose provides strength and rigidity to the cell wall, allowing plants to maintain their shape. 2. Which of the following organisms do NOT possess a cell wall? a) Bacteria b) Fungi c) Animals d) Plants Explanation: The correct answer is c) Animals. Unlike bacteria, fungi, and plants, animal cells do not possess a cell wall. Instead, animal cells are surrounded by a flexible cell membr ane that provides support and protection. 3. Which of the following is a function of the cell wall in bacteria? a) Regulation of cellular processes b) Facilitation of cell movement c) Protection against environmental stresses d) Synthesis of ATP Explanation: The correct answer is c) Protection against environmental stresses. In bacteria, the cell wall serves as a protective barrier against environmental stresses, such as osmotic pressure and the attack of certain substances. It helps maintain the shape and int egrity of the bacterial cell. 4. Which statement accurately describes the role of the cell wall in plant cells? a) It allows for cellular communication. b) It controls the entry of nutrients into the cell. c) It provides a barrier against water and solute mov ement. d) It is involved in energy production. Explanation: The correct answer is c) It provides a barrier against water and solute movement. The cell wall of plant cells acts as a barrier, preventing excessive water uptake and protecting the cell from bur sting under high osmotic pressure. It also restricts the movement of solutes, allowing plants to regulate nutrient uptake and maintain cellular homeostasis. 5. Which of the following is a component of bacterial cell walls? a) Lignin b) Collagen c) Peptidoglyc an d) Cellulose Explanation: The correct answer is c) Peptidoglycan. Bacterial cell walls are primarily composed of peptidoglycan, a complex polymer made up of sugars and amino acids. Peptidoglycan provides strength and rigidity to the bacterial cell wall. 6. The secondary cell wall is commonly found in which type of cells? a) Animal cells b) Plant cells c) Fungal cells d) Bacterial cells Explanation: The correct answer is b) Plant cells. Plant cells have a primary cell wall composed of cellulose, but some pla nt cells also develop a secondary cell wall, which is deposited inside the primary cell wall. The secondary cell wall provides additional strength and protection. 7. Which of the following is NOT a function of the fungal cell wall? a) Support and shape mainte nance b) Protection against mechanical stress c) Regulation of water and solute movement d) Facilitation of cell -cell communication Explanation: The correct answer is c) Regulation of water and solute movement. Fungal cell walls do not play a significant r ole in regulating water and solute movement. Instead, they provide structural support, protection, and aid in cell -cell communication. 8. The cell wall of Gram -negative bacteria differs from Gram -positive bacteria due to the presence of: a) Lignin b) Chitin c ) Lipopolysaccharides d) Pectin Explanation: The correct answer is c) Lipopolysaccharides. Gram -negative bacteria have an outer membrane composed of lipopolysaccharides (LPS), which is absent in Gram -positive bacteria. LPS helps protect the bacterial cell and plays a role in the immune response. 9. Which of the following is a function of the cell wall in plant cells? a) Photosynthesis b) DNA replication c) Cell division d) Defense against pathogens Explanation: The correct answer is d) Defense against pathogen s. The cell wall in plant cells acts as a physical barrier against pathogens and provides defense mechanisms to protect the plant from infections. It contains various compounds that can inhibit the growth of pathogens. 10. Which of the following is responsible for the flexibility and elasticity of the cell wall in certain organisms? a) Chitin b) Pectin c) Cellulose d) Peptidoglycan 11. /Explanation: The correct answer is b) Pectin. Pectin is a component of the cell wall in certain organisms, such as plants. It is r esponsible for the flexibility and elasticity of the cell wall, allowing it to expand and accommodate growth.
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