Quiz no. 4

RENU EDUCATIONALGROUP
RENU EDUCATIONAL GROUP BY VIJAY K VERMA
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.
Test3
VIRUSES, BACTERIAAND FUNGI

Hi
I am BETTY.
Your quiz instructor.
I ask you some question
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QUESTION 1

Question 1
Which of the following are characteristics of a virus?
(a) Respiration
(b) Growth
(c) Excretion
(d) Reproduction
Question 2

Viruses do not respire
No

Viruses do not grow but they do reassemble themselves in the
host’s cell
No

Viruses do not excrete
No

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

Question 2
Viruses can reproduce only…
(a) at certain temperatures
(b) inside a living cell
(c) in dry conditions
(d) inside bacteria
Question 3

Reproduction of viruses is not dependent on temperature.
They will produce at any temperature which does not
damage their host’s cells
No

Yes
Viruses can reproduce only in the cells of their
host organism

Unless the host is harmed by dry conditions, the virus
reproduces in the cytoplasm of the host’s cells
No

There are certain viruses, called bacteriophages, which
reproduce inside bacteria but this does not apply to all viruses
No

Question 3
Which of the following diseases is caused by a virus?
(a) Influenza
(b) Tuberculosis
(c) Syphilis
(d) Sore throat
Question 4

Yes
Influenza (‘flu’) is caused by a virus

Tuberculosis is caused by a bacterium, Mycobacterium
tuberculosis
No

Syphilis is caused by a spirochaete bacterium, Treponema
pallidum
No

Sore throat is caused by a Streptococcus bacterium.
No

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

A bacterial cell does have a cell wall but, unlike a plant cell
wall, it does not contain cellulose
No

Yes
A bacterial cell has no central vacuole

Yes
A bacterial cell has no nuclear membrane

A bacterial cell does have cytoplasm
No

Question 5
Most bacteria can be killed by …
(a) cooking
(b) refrigeration
(c) freezing
(d) canning
Question 6

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

Refrigeration at 4oC does not kill bacteria but slows down
their rate of reproduction so that the food remains safe for
longer periods
No

Freezing at about minus 18oC stops bacteria from reproducing
but does not kill them
No

Yes
Food is canned at high temperatures and
pressures to kill bacteria

Question 6
Which of the following is a bacterium?
(a) Penicillium notatum
(b) Candida albicans
(c) Plasmodium vivax
(d) Salmonella typhimurium
Question 7

Penicillium notatum is a mould fungus. It grows on decaying
fruit and other organic matter and is the source of the
antibiotic, Penicillin
No

Candida albicans is a yeast-like fungus. It causes a disease
called ‘thrush’
No

Plasmodium vivax is a protozoan parasite which causes
malaria
No

Yes
Salmonella typhimurium is a bacterium
which causes one form of food poisoning

Question 7
Which of the following diseases is caused by bacteria?
(a) Tinea
(b) The common cold
(c) Typhoid fever
(d) Diabetes
Question 8

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

The common cold is caused by a virus, (a ‘rhinovirus’).
No

Yes
Typhoid fever is caused by a
bacterium, Salmonella typhi.

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

Question 8
A fungus is made up of …
(a) hyphae
(b) cells
(c) cytoplasm
(d) chitin
Question 9

Yes
Hyphae are the living, thread-like
structures which form a fungus

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

A fungus is made up of hyphae which do contain cytoplasm,
but the fungus is not made solely of cytoplasm
No

Chitin is a component of the hyphal wall but the fungus is
not made up of chitin
No

Question 9
The 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

This is the ‘cap’ of the mushroom
No

These are the ‘gills’ of the mushroom. They carry the spores.
No

This is the mushroom’s ‘stalk’
No

Yes
This network of hyphae constitutes a ‘mycelium’

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

Fungi do not produce seeds
No

Fungi do have methods of sexual reproduction but they do
not result in the production of large numbers of offspring
No

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

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.

End of questions
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Quiz no. 4

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