Life Science Grade 11

Grade 11 Life Sciences Lesson Plans• This ensures the body has a long lasting protection against certain serious diseasessuch as polio or measles.• Antibiotics are substances that are secreted by fungi such as Penicillium (which growson fruit) and Streptomyces (which grows in the soil)• These substances will kill bacteria but do not harm living cells• Most pathogenic bacteria can be killed by one antibiotic or another although theyare not effective against viruses• Antibiotics assist the body’s immune system by helping to control the bacterial growthinside the body• The following are examples of antibiotic targets• The cell wall of the bacteria may become unstable and eventually burst whenexposed to an antibiotic E.g. penicillin• The cell membrane may be damaged so that it is not permeable anymore whenexposed to an antibiotic.• This causes the cell contents to leak and eventually to die• Protein synthesis cannot be completed, blocking the manufacture of cell proteinsand enzymes causing the bacteria to die• Diseases such as tuberculosis, strep throat and ear infections are all treatable byantibiotics since they are caused by bacteria• Have learners complete the activity on antibiotics3.2 Conclusion• Stress the difference between vaccines and antibiotics with learners• The activities may be completed for homework1. Learners complete theactivity by answeringquestions in theirworkbook10 min5 minm/environmental/life/humanbiology/immune-system15.htm• http://www.biotechnologyforums.com/thread-49.html• Solutions for all Life Sciences Gr.11 pp. 41 – 44; Oxford SuccessfulLife Sciences Gr. 11 pp. 25 - 26• Solutions for all Life Sciences Gr.11 Classroom Activity 16 pp. 44 -45; Oxford Successful LifeSciences Gr. 11 Activity pp. 25Term 1 Page 22© Gauteng Department of Education (CAPS version)