Page 75 - General and Inorganic Chemistry for Advanced Secondary Schools Students Book Form Five and Six
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Biology for Secondary Schools
Activity 5.1: Observing features of 2. Search from reliable internet
bacteria sources the videos that show
structures and shapes of bacteria.
Materials: Microscope, prepared
microscope slides of bacteria, charts 3. Describe the shapes and structural
FOR ONLINE READING ONLY
showing structure of bacteria, ICT tools, features of the bacteria you
notebook, and pen or pencil observed.
4. Based on your observations and
Procedure comparisons with diagrams in
1. Observe the charts that show Figure 5.4, discuss any similarities
structure of bacteria or prepared and differences you noted between
slides of bacteria using the the observed bacteria and the
microscope. diagrams in Figure 5.4.
(a)
(b)
(e)
(c) (d)
Figure 5.4: Structures and shapes of bacteria (a) spirilla (b) vibrio (c) bacilli (d) cocci
Structure of bacteria
Bacteria have circular DNA suspended in the cytoplasm without being enclosed
by the nuclear membrane. The cell wall encloses the cell membrane. Figure 5.5
shows a generalised structure of a bacterium.
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