Academic Year 2017- 2018 First Term Biology Revision Sheet Name: ____________________________ Date: _______________ Grade 9 Section: ______________ Q1: Choose the letter of the best answer ___ 1.What is the main function of the Golgi apparatus? A. communicates with another cell B. convert solar energy to chemical energy C. process and deliver proteins D. copy genetic material. ___2. Which of the following organelles can be found in cytoplasm and on the surface of the endoplasmic reticulum A. mitochondria B. centrosomes C. ribosomes D.centrioles ___ 3. What type of membrane allows some, but not all materials A. diffusible B. permeable C. impermeable D. selectively permeable ____4. What materials makes up a cell membrane? A. Phospholipids and cholesterol B. Cholesterol and protein C. Phospholipid, cholesterol and protein D. Phospholipid, protein and amino acid Page 1 of 7 ____5. What type of receptor is within a cell? A. Membrane receptor B. Intracellular receptor C. Intercellular receptor D. Ligand receptor ____6. Which part of phospholipid is hydrophobic? A. Glycerol B. fatty acid tail C. entire phospholipid molecule D. phosphate group only ____7. A ligand produces a response in a cell if it finds the right kind of A. carbohydrate. B. hormone. C. membrane. D.receptor. ____8. What is the term for the diffusion of water across a semipermeable membrane? A. osmosis B.equilibrium C.transport D.isotonic ____9.The movement of molecules down a concentration gradient through transport proteins in the cell membrane is a type of A. selective transport. B.osmosis C.energy expenditure. D.facilitated diffusion. ___10.Nucleus act as a A. power house of cell B. store house of cell C. makes proteins D.Both a & c ___11. Power house of cell is known as A. lysosomes B. Golgi bodies C. nucleus D. mitochondria Page 2 of 7 Q2: Draw a simple diagram to show how intracellular receptor and membrane Receptor. REFER ONLINE E- BOOK BIOLOGY PAGE 80 Q3: Describe one similarity and one difference between the two terms in each of the following pairs A. OSMOSIS The movement of molecules from a region of higher concentration to a region of lower concentration through a semipermeable membrane. FACILITATED DIFFUSION The movement of molecules down a concentration gradient through transport proteins in the cell membrane SIMILARITY Both allows materials through cell membrane. B. CELL WALL Cell wall is present in plant cell surrounded by a cell membrane. CELL MEMBRANE the semipermeable membrane surrounding the cytoplasm of a cell. SIMILARITY Both act as a protection barrier for the cell. Page 3 of 7 Q4: Short Answer Use the diagram below to answer items A. What is shown in the diagram? The structure of cell membrane B. What is the term for the molecules located in part A of the diagram? phospholipid C. Describe the arrangement of the molecules located in part A of the diagram. The cell membrane is made of two phospholipid layers embedded with other molecules such as proteins, carbohydrates, and cholesterol D. Cholesterol is located between the fatty acid chain; do you think that the cholesterol is polar or nonpolar? Explain your answer Non- polar, if cholesterol were polar, it would form hydrogen bonds with the polar heads and water. Instead, cholesterol is located between the fatty acid chains. Q5: Write and draw simple diagrams to show the difference between hypertonic, hypotonic and isotonic solutions and label your diagrams. Page 4 of 7 Hypertonic solution Isotonic solution Hypotonic solution It has more solutes If it has same It has fewer solutes than a than a cell, more water concentration of solutes as cell, more water enters a exists a cell in the cell, equal amount of cell in hypotonic solution, hypertonic solution, water enters and exit the causing the cell to expand causing the cell to cell, so its size stays or even burst. shrivel or die constant Q6: Match each term in column (A) with its definition in column (B) A B 1 Cytoskeleton 3 Closely layered stacks of membrane – enclosed spaces that process, sort and deliver protein. 2 Endoplasmic reticulum 6 Rigid layer that gives protection, support and shape the cell. 3 Golgi apparatus 8 The movement of molecules in a fluid or gas from region of higher concentration to region of lower concentration. 4 Mitochondria 1 Network of proteins that is changing to meet the needs of the cell. 5 Lysosome 9 The movement of molecules from region of lower concentration to region of higher concentration. 6 Cell wall 10 Type of endocytosis in which the cell membrane engulfs large particles 7 Cell membrane 2 Interconnected network of thin folded membrane, it helps in the production of protein and lipids. 8 Diffusion 7 Plasma membrane that forms a boundary between a cell and the outside environment. 9 Active transport 5 Membrane bonded organelles that contains enzymes. Page 5 of 7 10 Phagocytosis 4 Bean shaped structure that supply energy to the cell. Q7: Use the diagram given below to answer. A. Describe what is shown in Figure Plant cell and animal cell B. List two organelles shown in the diagram. Nucleus, mitochondria C. Which labeled structure is the site of photosynthesis? B D. Name the type of cell shown on the right side of the diagram. Plant cell E. Identify part F of the cell and write the name of the organelle Vacuole Q8: Answer the following questions. (7 points) 1. In what ways are lysosomes, vesicles and the central vacuole similar? All are membrane – bound organelles that store or separate certain substances. 2. Describe a semi permeable membrane with which you are already familiar The sieve through which filtration of tea/ coffee is done, the sieve absorbs the tea dust and act as semipermeable membrane. 3.Why do phospholipids form a double layer? In response to the presence of polar water molecules Page 6 of 7 surrounding them. the polar region interacts with the water inside and outside the cell forming hydrogen bonds. Non- polar are repelled by water. 4. Is energy required to move oxygen molecules across the cell membrane, from an area of high concentration to an area of low concentration? No energy is not required, as oxygen molecules diffuses through the membrane. 5. Write a short note on active transport and passive transport, give one example for each. The movement of molecules from a region of lower concentration to higher with energy requirement is called active transport, Ex: water pump The movement of molecules from a region of higher concentration to lower is called with no energy requirement is called passive transport. Ex: water flow. Page 7 of 7.