quiz no. 4
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Present
INTERACTIVE MULTIPLE CHOICE
QUESTIONS
These multiple choice questions 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.
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Test3
VIRUSES, BACTERIA AND FUNGI
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HiI am BETTY.
Your quiz instructor.I ask you some question OK.
R U Ready
QUESTION 1
Question 1
Which of the following are characteristics of a virus?
(a) Respiration
(b) Growth
(c) Excretion
(d) Reproduction
Question 2
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Viruses do not respire
No
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Viruses do not grow but they do reassemble themselves in the host’s cell
No
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Viruses do not excrete
No
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Yes
Viruses do reproduce inside the host’s cell. Their DNA (or RNA) replicates and they assemble new protein coats using the host’s resources
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Question 2
Viruses can reproduce only…
(a) at certain temperatures
(b) inside a living cell
(c) in dry conditions
(d) inside bacteria
Question 3
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Reproduction of viruses is not dependent on temperature. They will produce at any temperature which does not damage their host’s cells
No
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Yes
Viruses can reproduce only in the cells of their host organism
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Unless the host is harmed by dry conditions, the virus reproduces in the cytoplasm of the host’s cells
No
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There are certain viruses, called bacteriophages, which reproduce inside bacteria but this does not apply to all viruses
No
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Question 3
Which of the following diseases is caused by a virus?
(a) Influenza
(b) Tuberculosis
(c) Syphilis
(d) Sore throat
Question 4
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Yes
Influenza (‘flu’) is caused by a virus
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Tuberculosis is caused by a bacterium, Mycobacterium tuberculosis
No
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Syphilis is caused by a spirochaete bacterium, Treponema pallidum
No
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Sore throat is caused by a Streptococcus bacterium.
No
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Question 4
A bacterial cell differs from a plant cell by having …
(a) no cell wall
(b) no central vacuole
(c) no nuclear membrane
(d) no cytoplasm
Question 5
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A bacterial cell does have a cell wall but, unlike a plant cell wall, it does not contain cellulose
No
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Yes
A bacterial cell has no central vacuole
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Yes
A bacterial cell has no nuclear membrane
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A bacterial cell does have cytoplasm
No
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Question 5
Most bacteria can be killed by …
(a) cooking
(b) refrigeration
(c) freezing
(d) canning
Question 6
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Yes (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
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Refrigeration at 4oC does not kill bacteria but slows down their rate of reproduction so that the food remains safe for longer periods
No
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Freezing at about minus 18oC stops bacteria from reproducing but does not kill them
No
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Yes
Food is canned at high temperatures and pressures to kill bacteria
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Question 6
Which of the following is a bacterium?
(a) Penicillium notatum
(b) Candida albicans
(c) Plasmodium vivax
(d) Salmonella typhimurium
Question 7
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Penicillium notatum is a mould fungus. It grows on decaying fruit and other organic matter and is the source of the antibiotic, Penicillin
No
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Candida albicans is a yeast-like fungus. It causes a disease called ‘thrush’
No
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Plasmodium vivax is a protozoan parasite which causes malaria
No
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Yes
Salmonella typhimurium is a bacterium which causes one form of food poisoning
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Question 7
Which of the following diseases is caused by bacteria?
(a) Tinea
(b) The common cold
(c) Typhoid fever
(d) Diabetes
Question 8
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Tinea 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
No
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The common cold is caused by a virus, (a ‘rhinovirus’).
No
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Yes
Typhoid fever is caused by a bacterium, Salmonella typhi.
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Diabetes 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
No
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Question 8
A fungus is made up of …
(a) hyphae
(b) cells
(c) cytoplasm
(d) chitin
Question 9
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Yes
Hyphae are the living, thread-like structures which form a fungus
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Fungi are made up of hyphae which have a wall, cytoplasm and nuclei like plant cells but are in the form of long threads
No
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A fungus is made up of hyphae which do contain cytoplasm, but the fungus is not made solely of cytoplasm
No
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Chitin is a component of the hyphal wall but the fungus is not made up of chitin
No
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Question 9The drawing represents a mushroom partly in section. Which of the following structures represents the mycelium?
A
BC
D
soil level(a) A
(b) B
(c) C
(d) D
Question 10
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This is the ‘cap’ of the mushroom
No
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These are the ‘gills’ of the mushroom. They carry the spores.
No
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This is the mushroom’s ‘stalk’
No
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Yes
This network of hyphae constitutes a ‘mycelium’
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Question 10
Fungi have the potential to produce large numbers of offspring by ...
(a) producing many seeds
(b) sexual reproduction
(c) producing fruits
(d) producing many spores
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Fungi do not produce seeds
No
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Fungi do have methods of sexual reproduction but they do not result in the production of large numbers of offspring
No
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No
Mushrooms, toadstools and bracket fungi are sometimes called the ‘fruiting bodies’ of the fungus but this is a misleading term. These structures produce spores.
No
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Yes
Fungi 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.
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