Tut 3_Membranes _ Protein trafficking(student)

St Andrew’s Junior College The Cell and Biomolecules of Life / Membranes & Protein Trafficking 2021 H1 Biology 1 Full Name: Civics group: 21S Index no.: Date: Core Idea 1: The Cell and Biomolecules of Life Membranes & Protein Trafficking Tutorial 3 MCQ 1 The structure of phospholipids includes the following: 1 glycerol linked to fatty acids 2 hydrophobic fatty acid chains 3 ester bonds 4 phosphate group attached to glycerol Which structure(s) enable formation of a lipid bilayer in cell surface membranes? A 1 and 3 B 2 and 3 C 2 and 4 D 1, 2 and 4 2 The cell surface membrane structure is described as a ‘fluid mosaic’. Which statement describes the ‘mosaic’ part of the cell surface membrane? A the different patterns that are obtained by the moving phospholipid molecules B the random distribution of cholesterol molecules within the phospholipid bilayer C the regular pattern produced by the phospholipid heads and membrane proteins D the scattering of the different proteins within the phospholipid bilayer 1 2 3 4 5 6 7 8 9 10

St Andrew’s Junior College The Cell and Biomolecules of Life / Membranes & Protein Trafficking 2021 H1 Biology 2 3 The diagram below shows a section of a cell surface membrane. Which of the following statements are correct? 1 Structure A is found only on the extracellular surface of the membrane. 2 Structure B may contain a channel that is hydrophilic to allow ions to move across the membrane. 3 Structure C allows transport of substances across the membrane only in the presence of ATP. 4 Structure C is found only on one surface of the membrane. A 1, 2 and 4 B 2, 3 and 4 C 1 and 2 D 2 and 3 4 The cell surface membranes of plants adapted to cold conditions change as the weather gets colder, allowing the plants to carry out exocytosis. Which change occurs? A a decrease in the ratio of proteins to saturated phospholipids B a decrease in the ratio of unsaturated phospholipids to saturated phospholipids C an increase in the ratio of proteins to unsaturated phospholipids D an increase in the ratio of unsaturated phospholipids to satur ated phospholipids

St Andrew’s Junior College The Cell and Biomolecules of Life / Membranes & Protein Trafficking 2021 H1 Biology 3 5 The cell membrane of an African desert rat and that of the Arctic red fox are compared to investigate their composition. Which of the following is the most probable makeup of the respective membranes? Amount of saturated fatty acids Amount of cholesterol Arctic red fox Desert rat Arctic red fox Desert rat A Low High Low High B High Low Low Low C Low High High High D High Low High Low 6 What are the features of facilitated diffusion? uses proteins in membrane uses ATP molecules move down a concentration gradient A √ √ √ B x √ √ C √ x √ D √ √ x 7 Which statements about the