Online Biochemistry Test - Biochemistry Test 9

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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Which of the following amino acid contain an imidazolium moiety?

Alanine

Valine

Cysteine

Histidine

[#]

Serine and threonine are polar amino acids due to

reactive hydroxyl group in the side chain

reactive alcoholic group in the side chain

reactive keto group in the side chain

reactive aldehyde group in the side chain

[#]

Which of the following is most likely to produce anaphylaxis in a susceptible individual?

Pollen

Mold

Dust

Bee sting

[#]

Antibodies can be used

for the localization of proteins in the cell

for protein purification

to catalyze chemical reactions

all of the above

[#]

Which of the following is in the lymph nodes of a person battling a cold virus?

Huge numbers of white blood cells

Trapped viruses that have been roaming the body

Lymph ducts that enter and exit the nodes and Lymph fluid

All of the above

[#]

What is the range of melting point temperatures (Tm) for most DNA molecules?

50 to 60°C

60 to 80°C

70 to 90°C

80 to l00°C

[#]

The structure in a bacterium that indicates an active site for protein synthesis is

a chromosome.

a cell membrane,

a flagellum.

a polysome.

[#]

Ribosomes select the correct tRNAs

then bind to the appropriate mRNA

solely on the basis of their anticodons

depending on their abundance in the cytosol

with the least abundant anticodons

[#]

Restriction enzymes are named for

the person who discovered

the bacterium they are derived from

the viral DNA that they attack

none of the above

[#]

10.

How many ds DNA molecule can be produced, which comprise precisely the target region in double strand form during 4th cycle of PCR?

Two ds DNA molecule

Three ds DNA molecule

Eight ds DNA molecule

Four ds DNA molecule

[#]

11.

In a PCR reaction after four cycles, each molecule of a duplex DNA will give rise to

16 single strands of DNA

16 double stranded DNA

18 single strands of DNA

18 double stranded DNA

[#]

12.

Restriction maps

allows comparison between DNA molecules without the need to determine nucleotide sequence

allows comparison between DNA molecules but requires to determine nucleotide sequence

does not allow comparison between DNA molecules

none of the above

[#]

13.

Which of the following enzyme does not take part in the TCA cycle?

Citrate synthase

Iso-citrate dehydrogenase

Pyruvate dehydrogenase

Malate dehydrogenase

[#]

14.

A person with phenylketonuria cannot convert

phenylalanine to tyrosine

phenylalanine to isoleucine

phenol into ketones

phenylalanine to lysine

[#]

15.

Which of these is a symptom of vitamin A deficiency?

Osteoporosis

Impaired taste perception

Blindness

Impaired blood clotting

[#]

16.

Dihydroorotate dehydrogenase contains

4 flavins and 4 atoms of iron per molecule

2 flavins and 4 atoms of iron per molecule

2 flavins and 2 atoms of iron per molecule

4 flavins and 2 atoms of iron per molecule

[#]

17.

Ascorbic acid acts as an

reducing agent

oxidizing agent

oxidizing and reducing agent both

none of the above

[#]

18.

Which can be used as a mobile phase in HPLC applications?

Any compound with solubility in liquid

Any compound with limited solubility in liquid

Any compound with non-solubility in liquid

Any of the above

[#]

19.

30 nm wide helix with five or six nucleosomes per helix is known as

solenoid

halonoid

kinoplast

none of these

[#]

20.

Which of the following is correct?

Replication starts at a single origin

Replication is bidirectional

Replication is semi conservative

All of the above

[#]

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Online Biochemistry Test - Biochemistry Test 9

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