Asdas Essay

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UNIVERSITI TUNKU ABDUL RAHMAN CENTRE FOR FOUNDATION STUDIES FOUNDATION IN SCIENCE MAY 2015 FHSB 1214 BIOLOGY I TUTORIAL 5 OVERVIEW OF MEMBRANE STRUCTURE AND TRANSPORT Student’s Guide: At university level, the tutor facilitates student learning without spoon-feeding. Therefore, you are expected to: • Read your textbook, attempt the questions before the tutorial • You may enter the class and sign your attendance after showing your tutor that all tutorial questions have been completed; even if you don’t know how to do, write something - you’re not advised to leave answers blank in the finals. • Write answers on board if you wish to receive tutor feedback (no answer, no feedback) • Be independent: consult textbooks or dictionaries on your own first before asking the tutor • All questions are compulsory. 1 mark may reflect 1 answer point. (No half mark is awarded in the finals marks) (Source: Final Examination, Dec 2009) Q1. (a) Figure 2.1 shows the fluid mosaic model of the plasma membrane. Figure 2.1 i) Explain why biologists describe plasma membrane as fluid mosaics. (2 marks) (ii) Identify structures X, Y and Z. (3 marks) iii) Predict the fate of plasma membrane if structure Y is absent. (2 marks) (Source: Final examination, Dec 2012, truncated) Q2. (a) Active transport and passive transport are important for a cell to move substances across its plasma membrane. Contrast active transport and passive transport by using the criteria listed in Table 2.1. |Criteria |Active transport |Passive transport | |Mode of transportation of | |

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