SAJC 1_Tut 1_Cell theory_ Cell structures_functions (Annotated MS)

St Andrew’s Junior College The Cell and Biomolecules of Life / Cell Theory, Structure & functions of oganelles 2022 H2 Biology 1 Full Name: Civics group: 22S Index no.: Date: Core Idea 1: The Cell and Biomolecules of Life Tutorial 1 Section A (Annotated MS) The Cell Theory Structures & functions of organelles MCQ SECTION A: CELL THEORY, TYPE OF CELLS, NUCLEUS, NUCLEOLUS, CENTRIOLES ANSWERS FOR SECTION A: 1 2 3 4 5 6 7 8 9 10 A D C B B A A C B D 1 Which of the following is not one of the main components of the cell theory? A Cells must contain DNA B All living things are made of cells C Cells can only come from other cells D Cells are the basic unit of life 2 Which size ranges can be viewed using a light microscope? A 4 only B 1 and 2 only C 2 and 3 only D 3 and 4 only 3 tenets of cell theory Refer to diagram on lecture notes pg 6

St Andrew’s Junior College The Cell and Biomolecules of Life / Cell Theory, Structure & functions of oganelles 2022 H2 Biology 2 3 The diagram shows a chloroplast drawn from an electronmicrograph. The length of the chloroplast from X to Y is 5000 nm. What is the magnification of the drawing of the chloroplast? A x100 B X1000 C X10 000 D X100 000 Working: Magnification = image / actual = 5.7 cm / 5000 nm = 5.7 x 10-2 m / 5000 x 10-9 m = 1.14 x 104 ~ x 10 000 SI unit is nm, hence indicate actual size of chloroplast. Indicated use of electron microscopy. Hence ultrastructure inside organelle can be seen.

St Andrew’s Junior College The Cell and Biomolecules of Life / Cell Theory, Structure & functions of oganelles 2022 H2 Biology 3 4 The electronmicrograph is of a chloroplast. The length of the chloroplast along the line shown is 80 mm. The actual length of the chloroplast is 10 µm. What is the magnification of the chloroplast? A x8 x 102 B x8 x 103 C x8 x 104 D x8 x 106 5 You are told that the cells on a microscope slide are plant, animal, or bacterial. You look at them through a microscope and see cell walls and membrane-bound organelles. You conclude that the cells are A Bacteria cells B Plant cells C Bacteria and plant cells D Bacteria, plant, and animal cells Working: Magnification = image / actual = 80 mm / 10 µm = 80 x 10-3 m / 10 x 10-6 m = 8 x 103 indicate either Plant cells (cellulose cell wall) or bacterial cell (peptidoglycan cell wall) - from Q cannot tell what type of material is cell wall made up of, without the use of specific dye staining - Presence of cell wall eliminate animal cell (which has no cell wall) from answer. confirmed Plant cells [eukaryotic cells] (prokaryotes eg bacteria cell lack membrane-bound organelles)

St Andrew’s Junior College The Cell and Biomolecules of Life / Cell Theory, Structure & functions of oganelles 2022 H2 Biology 4 6