Online Biochemistry Test - Biochemistry Test - Random

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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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1.

The effectiveness or capacity of a buffer solution can be affected by

molar concentration of the buffer components

concentration of the conjugate base to the weak acid

both (a) and (b)

temperature of buffer components

[#]

2.

Which hemoglobin chain replaces the beta chain in embryonic hemoglobulin?

Delta

Epsilon

Gamma

Alfa

[#]

3.

Which of the following is an example of tertiary structure in a protein?

A multimeric protein

An a-helix

A P-pleated sheet

A globular domain

[#]

4.

Secondary structure in protein refers to

linear sequence of amino acids joined together by peptide bond

three dimensional arrangement of all amino acids in polypeptide chain

regular folding of regions of the polypeptide chain

protein made up of more than one polypeptide chain

[#]

5.

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

[#]

6.

In Fluid mosaic model, the biological membrane can be viewed as

two dimensional solutions of oriented lipids and globular proteins

three dimensional solutions of oriented lipids and globular proteins

two dimensional solutions of oriented lipids and carbohydrate

three dimensional solutions of oriented lipids and carbohydrate

[#]

7.

In DNA, guanine pairs with

Adenine

Cytosine

Thymine

Uracil

[#]

8.

The codons which do not specify an amino acid are called

initiation code

termination code

propagation code

none of these

[#]

9.

What is the average size (in bp) of a mature t-RNA?

80 bp

100 bp

120 bp

140 bp

[#]

10.

Which of the following is the smallest of the RNAs?

Messenger RNA

Transfer RNAs

Ribosomal RNAs

All of these

[#]

11.

Sickle cell disease is due to

a mutation in the beta chain of Hb

a mutation in the alpha chain of Hb

infection with a parasite

none of the above

[#]

12.

In the presence of high levels of tryptophan

attenuator allows transcription of trp structural genes

attenuator propogates transcription

attenuator terminates transcription

none of the above

[#]

13.

In gel electrophoresis, DNA molecules migrate from __________ to __________ ends of the gel.

negative ... positive

basic ... acidic

long ... short

positive to negative

[#]

14.

Bactriophages absorb to a bacterial surface and inject the phage DNA through the

cell wall into cytosol

cell wall into plasmamembrane

both (a) and (b)

cell wall into endoplasmic reticulum

[#]

15.

Rubisco (RuBP Carboxylase-oxygenase enzyme), glyceraldehyde 3-phosphate, and NADPH all play a role in

the dark reactions of photosynthesis

the breakdown of glucose into CO₂

cellular respiration when O₂ is present

alcohol fermentation

[#]

16.

Which of these hormones is a catecholamine?

Follitropin

Norepinephrine

Tetraiodothyronine

Tetrahydrofolate

[#]

17.

Sample retention in the column is measured by

retention time

retention factor

retention index

all of these

[#]

18.

The packing ratio of nucleosomes is about

6

8

7

9

[#]

19.

DNA polymerases I also has

5'-3' exonuclease activity

3'-5'exonuclease activity

both (a) and (b)

5'-3' endonuclease activity

[#]

20.

What is the consensus N-glycosylation site in a protein sequence?

Asn-Xaa-(Ser or Thr)

(Ser or Thr)-Asn-Ala

Thr-(Asn or Gln)-Ala

None of these

[#]

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