Online Biochemistry Test - Biochemistry Test 3

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Total number of questions: 20.
Time allotted: 30 minutes.
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In β-pleated sheet structures neighbouring

chains lie in a flat plane

neighboring residues are hydrogen bonded

neighboring chains are connected by a-helices

neighboring chains are hydrogen bonded

[#]

Bisphosphoglycerate (BPG) cannot bind to the oxygenated R state of hemoglobin because

it is displaced from the heme by oxygen

it is displaced from the heme by movement of the proximal histidine

its binding pocket becomes too small to accommodate BPG

BPG binds to the R state with the same affinity as the T state

[#]

The nucleophile in serine proteases is

Serine

water

both (a) and (b)

Asparagine

[#]

What would happen if serum is omitted from the ELISA, but all other steps remain same?

Anti-human Ig-conjugate would not bind and be washed away

The OD values would be nearly the same as the assay control

Both (a) and (b)

Anti-human Ig-conjugate would bind non-specifically to the ELISA plate

[#]

An antigen preparation and an antibody preparation are tested by immunodiffusion. Three bands are found, indicating that

there was more than one antigen

the antibody was impure

the temperature was too high

there was one antibody and one antigen

[#]

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

[#]

Bacteriorhodopsin

absorbs light and pumps protons

is an integral membrane protein

contains primarily alpha-helical residues

all of the above

[#]

In terms of cell communication, what do bacterial pathogens such as cholera and anthrax have in common?

They destroy the receptors for key signaling molecules

They prevent the production of key signaling molecules

They alter the chemical structure of key signaling molecules

They block the normal functioning of signal transduction mechanisms

[#]

Which of the following is incorrect?

In DNA double helix, two strands of the DNA are bound with each other with the bases

Adenine always pairs with thymine

Guanine always pairs with the cytosine

None of the above

[#]

10.

In RNA, uracil pairs with

adenine

cytosine

thymine

guanine

[#]

11.

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

[#]

12.

Fructose is metabolized by

fructose 1-phosphate pathway

fructose 6-phosphate pathway

glyceraldehyde 3-phosphate pathway

both (a) and (b)

[#]

13.

Where the acyl-CoA formed in the cytosol is transported for oxidation?

Mitochondrial matrix

Microsomes

Endoplasmic reticulum

Remains in cytosol

[#]

14.

In what form does the product of glycolysis enter the TCA cycle?

AcetylCoA

Pyruvate

NADH

Glucose

[#]

15.

NADP⁺ is reduced to NADPH during

light dependent reactions

photorespiration

calvin cylcle

none of these

[#]

16.

The frequency of precession, the transition frequency and the Larmor frequency are

different terms for the same frequency

same terms for the same frequency

different terms for the different frequency

same terms for the different frequency

[#]

17.

Doubling the column's length increases resolution by a factor of

(2)^0.5

[#]

18.

Column efficiency is measured in terms of number of plates which is

inversely related to the square of the peak width

directly related to the square of the peak width

inversely related to the cube root of the peak width

directly related to the square of the peak width

[#]

19.

Number of times the two DNA strands are interwined in circular DNA and is known as

helix frequency

linking number

twisting number

none of these

[#]

20.

The function of gluconeogenesis is

maintenance of blood glucose levels during starvation or a low carbohydrate diet

recovery of lactate from fermentation and glycerol from fat breakdown

a pathway for the utilization of amino acids

all of the above

[#]

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Online Biochemistry Test - Biochemistry Test 3

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