quiz No. 4

RENU EDUCATIONAL GROUP

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, BACTERIA AND FUNGI



Hi

I 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



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

B C

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

Back to start

End show



quiz No. 4

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