Presentation on theme: "INTERACTIVE MULTIPLE CHOICE QUESTIONS"— Presentation transcript:
1INTERACTIVE MULTIPLE CHOICE QUESTIONS Viruses, Bacteria and FungiThe answers are provided. Explanations of why the alternatives are unsatisfactory are also offered
2These multiple choice questions are similar to the ones set by the GCSE and IGCSE Examination Boards except that, in some cases, there may be more than one acceptable answer.For this reason, even if you select a correct answer at your first attempt, it is worth looking at all the alternatives(a) to see if there is a better answer and(b) to see why some of the alternatives are unacceptable.First slide
3Question 1 Which of the following are characteristics of a virus? (a) Respiration(b) Growth(c) Excretion(d) ReproductionQuestion 2
23Question 5 Most bacteria can be killed by … (a) cooking (b) refrigeration(c) freezing(d) canningQuestion 6
24Yes (within limits)If the temperature is high enough and the cooking reasonably prolonged, the majority of bacteria will be killed There will probably be a residual population of bacteria but not in sufficient numbers to cause disease However, if the cooked food is left at room temperature, this small population will multiply rapidly
25NoRefrigeration at 4oC does not kill bacteria but slows down their rate of reproduction so that the food remains safe for longer periods
26NoFreezing at about minus 18oC stops bacteria from reproducing but does not kill them
27YesFood is canned at high temperatures and pressures to kill bacteria
28Question 6 Which of the following is a bacterium? (a) Penicillium notatum(b) Candida albicans(c) Plasmodium vivax(d) Salmonella typhimuriumQuestion 7
29NoPenicillium notatum is a mould fungus. It grows on decaying fruit and other organic matter and is the source of the antibiotic, Penicillin
30NoCandida albicans is a yeast-like fungus. It causes a disease called ‘thrush’
31NoPlasmodium vivax is a protozoan parasite which causes malaria
32YesSalmonella typhimurium is a bacterium which causes one form of food poisoning
33Question 7 Which of the following diseases is caused by bacteria? (a) Tinea(b) The common cold(c) Typhoid fever(d) DiabetesQuestion 8
34NoTinea is a skin infection caused by one of a number of fungal parasites which cause inflammation between the toes (‘athletes’ foot’), on the scalp or in the pubic region
35NoThe common cold is caused by a virus, (a ‘rhinovirus’).
36YesTyphoid fever is caused by a bacterium, Salmonella typhi.
37NoDiabetes is not an infectious disease. It arises as a result of either (a) a failure of the pancreas to produce sufficient insulin or (b) an inability of the body to use insulin effectively
38Question 8 A fungus is made up of … (a) hyphae (b) cells (c) cytoplasm (d) chitinQuestion 9
39YesHyphae are the living, thread-like structures which form a fungus
40NoFungi are made up of hyphae which have a wall, cytoplasm and nuclei like plant cells but are in the form of long threads
41NoA fungus is made up of hyphae which do contain cytoplasm, but the fungus is not made solely of cytoplasm
42NoChitin is a component of the hyphal wall but the fungus is not made up of chitin
43Question 9AThe drawing represents a mushroom partly in section. Which of the following structures represents the mycelium?CBsoil level(a) A(b) B(c) CD(d) DQuestion 10
50NoFungi do have methods of sexual reproduction but they do not result in the production of large numbers of offspring
51NoMushrooms, toadstools and bracket fungi are sometimes called the ‘fruiting bodies’ of the fungus but this is a misleading term. These structures produce spores.
52YesFungi produce a huge number of single-celled, microscopic spores. Each one can produce a mycelium if it lands in a suitable place, but only a tiny minority succeed.The giant puffball produces trillions of spores which appear as a brown dust cloud if you tread on it.