SBI4U0 Quiz 1: Cells, Cell Membrane, and Enzymes PDF

SBI4U0 Name: Quiz 1: Cells, Cell Membrane and Enzymes Out of : /50 1. Answer the following true or false questions by circling T for true and F for...

SBI4U0 Name: Quiz 1: Cells, Cell Membrane and Enzymes Out of : /50 1. Answer the following true or false questions by circling T for true and F for false. [ /5] a) Membrane proteins can bind to the cytoskeleton to provide structural support T F b) Protein receptors have low specificity so that they can bind a variety of molecules T F c) The interior portion of the plasma membrane is hydrophilic T F d) Proteins cannot change shape once embedded in the membrane T F e) Enzyme activity can change in the presence of an acid or base T F 2. Indicate which part of the cell the following components would be found: [ /6] Cholesterol Cell membrane Cellulose Cell wall Chromatin Necleus Hydrolytic enzymes lysossomes Nucleus Microfilaments inside cytoplasm 3. Label the parts of the cell indicated in both diagrams and state their functions. State their function as well: [ /4] 4. What will be the purpose of using distilled water in the lactase enzyme lab? [ /2] The purpose of using distilled water was to see the concentration gradient. If the potato shrank in size it was hypertonic and if it grew in size it was hypotonic. Since we put the potato in water it grew in size making it hypotonic, while the salt solution made the potato shrink in size which was hypertonic 5. ALL of the following statements are false. Read the statements carefully and identify the incorrect word. Circle the incorrect word. Write a replacement word in the space provided so that the statement becomes true. (8 marks) a) Semi-permeable membranes can control which molecules pass through b) Glycocalyx refers to the amino acid chains attached to membrane proteins c) The purpose of active transport is to help the cell reach dynamic equilibrium d) Diffusion involves the movement of water molecules 1  e) RME takes place in the lungs when O2 moves from the lungs to the blood f) The Na+/K+ pump is essential in the mitochondrial production of ATP energy and not mitochondrial g) Endocytosis is used for the removal of waste from the cell toxins not waste h) An extremely isotonic solution can cause a cell to undergo lysis 6. Find the word on the right that best corresponds to the word on the left. (5 marks) Flaccid 7. Answer the following true or false Active D questions by circling T for true and F for false. Transport (6 marks) Coupled Transport a) Membrane proteins can bind to the Pinocytosis J cytoskeleton to provide structural Plasma C support T F Membrane A Proton pump F Hypertonic solution b) A cell membrane can never separate from the ATP→ADP+ cell wall B G Hypotonic solution T P F Fluid mosaic C H Isotonic solution c) Protein receptors have low specificity model so that D RME I Cell drinking they can bind a variety of molecules T F Na+/K+ E J Cell eating Pump d) Facilitated diffusion requires the help of ATP T F e) Passive transport relies on the existence of a concentration gradient T F f) The interior portion of the plasma membrane is hydrophilic T F g) In diffusion, solutes move from an area of low conc to an area of high conc T F h) Proteins cannot change shape once embedded in the membrane T F 8. Fill in the blanks: : (5 marks) The sodium/potassium pump can pump __3__ (#) sodium ions out of the cell for every __2__ (#) potassium ions that are pumped in. This requires the input of the energy molecule _____. This molecule donates a _______functional_______ group so that the protein can change _____chemical reaction________. 9. Explain what is meant by “no net movement”: (1 mark) Net movement is the overall movement of molecules so no net movement is no molecules moving 10. Dipping a sucrose strip into a glucose solution would provide a test result. (+/--) (1 mark) 11. Using your knowledge of enzyme nomenclature, what might be the function of the following enzymes? (2 mark) a) dehydrogenase: coemzymes b) sucrase: coemzymes 12. Assume B, C, D and E are products of a reaction. Describe what is happening in the diagram below (one sentence). 13. Using the graph below, answer questions (a) to (d) - answer A, A1, A2, B, B1, B2, C or none. a) Which line represents an endergonic reaction? 2  b) Which line represents an exothermic reaction? c) Which line shows a reaction using an enzyme? d) For line A, where would you find more bonds? Progress of the reaction 3