Online Biochemistry Test - Biochemistry Test - Random

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Total number of questions: 20.
Time allotted: 30 minutes.
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Which of the following statement is incorrect?

Hemoglobin and myoglobin are the two oxygen binding proteins

Hemoglobin transports O₂ in the blood

Myoglobin stores O₂ in muscles

None of the above

[#]

Before they can react, many molecules need to be destabilized. This state is typically achieved through

changing the three-dimensional shape of the molecule

oxidizing the molecules by removing electrons

changing the reaction from a biosynthetic to a catabolic pathway

the input of a small amount of activation energy

[#]

The immunoglobulin fold is

found only in IgG molecules

a β-barrel composed of a three- and a four-stranded antiparallel β-sheet

both (a) and (b)

found six times in the IgG molecule

[#]

Immunogenicity

depends on the ability of the native antigen to be presented by MHC

is usually a property of self antigens such as eye tissue

is not a property of antibodies

is not a property of haptens

[#]

Cholesterol is essential for normal membrane functions because it

plugs up the cardiac arteries of older men

cannot be made by higher organisms

keeps membranes fluid.

spans the thickness of the bilayer

[#]

If a disease of the blood vessels caused the endothelial cells of the vessel to die, what effect would that have on the cellular activities associated with vasodilation?

Nitric oxide would no longer be produced

Smooth muscle cells could not be made to relax

It would be more difficult to increase blood flow and reduce blood pressure

All of the above

[#]

What is the only common methylation in the DNA of eukaryotes?

Adenosine in GpA dinucleotides

Guanosine in ApGpA trinucleotides

Cytosine in CpG dinucleotides

None of the above

[#]

How many amino acids will be encoded by 5' GAU GGU UGA UGU 3' sequence?

One

Two

Three

Four

[#]

The binding of lac repressor to DNA could be considered to be analogous to

competitive inhibition of an enzyme

mixed-type inhibition of an enzyme

uncompetitive inhibition of an enzyme

allosteric effects in enzyme regulation

[#]

10.

Which of the following has unusual bases?

mRNA

tRNA

rRNA

hnRNA

[#]

11.

Amino acids are joined together into a protein chain by which of the following?

Transfer RNA

DNA polymerase

Hydrogen bonds

Messenger RNA

[#]

12.

Isoschizomers recognize

same recognition sequence but different recognition site

same recognition site and recognition sequence

same recognition site and different recognition sequence

different recognition site and different recognition sequence

[#]

13.

Double stranded DNA denaturation with specified limit of temperature is

reversible reaction

irreversible reaction

either (a) or (b)

none of these

[#]

14.

FAD is reduced to FADH₂ during

electron transport phosphorylation

lactate fermentation

Krebs cycle

glycolysis

[#]

15.

If the oxygen is labeled in CO₂ and provide this CO₂ to a plant, where it is expected to find this labeled oxygen after the plant had undergone photosynthesis?

In the water used

In the NADPH

In the carbohydrate produced

In the oxygen given off by the plant

[#]

16.

A deficiency of Vitamin K results in a decreased level of

prothrombin

thrombin

fibrin

fibrinogen

[#]

17.

A combination of paper chromatography and electrophoresis involves

partition chromatography

electrical mobility of the ionic species

both (a) and (b)

none of these

[#]

18.

In reverse phase chromatography, the stationary phase is made

non-polar

polar

either non-polar or polar

none of these

[#]

19.

Okazaki fragments occur on the __________ and are bonded together by __________

Leading strand, polymerase

mRNA, anticodons

Lagging strand, ligase

tRNA, polymerase

[#]

20.

What is the cause of the genetic disease known as Galactosemia?

Deficiency in lactase

Absence of galactose 1-P uridyl transferase

Absence of lactose synthetase

Non functioning of semnase

[#]

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