Online Microbiology Test - Microbiology Test 7

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Total number of questions: 20.
Time allotted: 30 minutes.
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Which of the following sequences has helped in identifying eukaryotes, eubacteria and archeabacterial cell types?

Signature sequence

Signal sequence

Shine-Dalgarno sequence

Amino acid sequence

[#]

Eukaryotic micro organisms include

protozoa

fungi

algae

all of these

[#]

Which of the following chemotherapeutic agents may affect the growth of Campylobacter jejuni?

Vacomycin

Polymyxin

Trimethoprim

None of these

[#]

Starvation proteins are produced by a culture during which of the following segments of the growth curve?

Lag phase

Exponential phase

Stationary phase

Death phase

[#]

If the Keq for an enzymatic reaction is greater than 1, the reaction

will be endergonic

can not occur without the input of energy

both (a) and (b)

none of these

[#]

Free energy change (ΔG) of a reaction is referred as the amount of energy

liberated during reaction

taken up during reaction

liberated or taken up during reaction

none of these

[#]

Which of the following statement is correct?

The size and sequence of introns can be deduced from the cDNA sequence

Restriction endonuclease can cleave ss and dsDNA both

Restriction fragment length polymorphism (RFLP) is usually formed in coding sequence of a gene

Amino acid sequence of a protein can be deduced from corresponding cDNA nucleotide

[#]

Which of the following mediates Type I hypersensitivity reaction?

IgE

IgG

IgM

IgD

[#]

Ascoli's thermoprecipition test helps in confirming the laboratory diagnosis of

tetanus

anthrax

typhoid

cholera

[#]

10.

The first step in infection of a host bacterial cells by a phage is

adsorption

absorption

penetration

replication

[#]

11.

Viropexis takes place in the phagocytic vacuoles and is due to the action of enzymes

DNA gyrase

lysosomal protease

lysosomal lipase

all of these

[#]

12.

The uncontrolled proliferation of cells is termed as

hyperplasia

anaplasia

metastasis

all of these

[#]

13.

Which of the following is a drug that interferes with the process of DNA production in the virus that causes genital herpes?

Erythromycin

Vancomycin

Amantadine

Acyclovir

[#]

14.

Bacterial cells susceptible to penicillium can be protected from destruction if the medium in which they are exposed is of

high osmotic pressure

low osmotic pressure

moderate osmotic pressure

high surface tension

[#]

15.

Which of the antibiotic is not used as a food preservative ?

Pimaricin

Nisin

Tylosin

β-lactam antibiotic

[#]

16.

Trickling filter comes under

primary treatment

secondary treatment

tertiary treatment

none of these

[#]

17.

High acid foods with a pH above 5.3 are especially subjected to

flat sour spoilage

putrefaction

both (a) and (b)

TA spoilage

[#]

18.

Commercial scale production of amino acids is typically carried out using

regulatory mutants to cause overproduction of biochemical intermediates

creation of an intentional increase in membrane permeability to increase release of the amino acids

both (a) and (b)

none of the above

[#]

19.

The other name of invertase enzyme is

sucrase

saccharase

isomerase

both (a) and (b)

[#]

20.

During the first 10 minutes after injection of phage DNA, no phage can be recovered by disrupting the infected bacterium. This is termed as

eclipse period

rise period

latent period

burst size

[#]

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Online Microbiology Test - Microbiology Test 7

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