Online Biochemistry Test - Biochemistry Test 4

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Total number of questions: 20.
Time allotted: 30 minutes.
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Which of the following structures is expected in a bacterium?

Nucleus

Plasma membrane

Golgi apparatus

Endoplasmic reticulum

[#]

The nature of peptide bond can be best explained as

partial double bond

truly double bond

Hydrogen bond

Van der waals force

[#]

Which of the following is the most correct?

Charged amino acids are never buried in the interior of a protein

Charged amino acids are seldom buried in the interior of a protein

All hydrophobic amino acids are buried when a protein folds

Tyrosine is only found in the interior of proteins

[#]

A pathogen can be a (n)

agent that causes a disease

virus

bacteria

All of these

[#]

Which of the Rous sarcoma virus has a homologous cellular protein?

c-src

v-src

v-ha-src

v-ha-ras

[#]

If one cell has AT contents 40%, what will be the percentage of Guanine residue?

60%

15%

30%

Guanine residue can not be calculated

[#]

Methylated gene are

active

silent

dynamic

either (a) or (b)

[#]

ATP is from which general category of molecules?

Polysaccharides

Proteins

Nucleotides

Amino acids

[#]

Why does the glycolytic pathway continue in the direction of glucose catabolism?

There are essentially three irreversible reactions that act as the driving force for the pathway

High levels of ATP keep the pathway going in a forward direction

The enzymes of glycolysis only function in one direction

Glycolysis occurs in either direction

[#]

10.

The key enzyme in the regulation of fatty acid synthesis is

acetyl CoA carboxylase

AMP activated proteinkinase

protein phosphatase

none of these

[#]

11.

Fatty acid synthesis takes place in

mitochondria

cell membrane

cytosol

endoplasmic reticulum

[#]

12.

Cholestrol is the precursor of

steroid hormones

vitamin A

bile salts

both (a) and (c)

[#]

13.

Vitamin K₁ was first isolated from alfalalfa and has the phytyl side chain consisting of

four isoprene units

six isoprene units

nine isoprene units

four isoprene units

[#]

14.

A fat-soluble vitamin that regulates blood clotting is

vitamin A

vitamin K

vitamin C

niacin

[#]

15.

Which of the following mineral deficiency may result into impaired growth and development, skin lesions and loss of appetite?

Zinc

Cobalt

Iron

Magnesium

[#]

16.

Which of the following will oscillate the fastest?

A large mass on a weak spring

A large mass on a stiff spring

A small mass on a stiff spring

A small mass on a weak spring

[#]

17.

Which of the following(s) is/are the advantage of HPLC over traditional LPLC (low-pressure liquid chromatography)?

Greater sensitivity and reusable columns

Ideal for ionic species and large molecules

Sample recovery

All of the above

[#]

18.

In an agarose gel, DNA is moving from

cathode to anode

left to right

anode to cathode

A to B

[#]

19.

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

[#]

20.

Fructose diphosphate accumulation would

inhibit glycolysis and gluconeogenesis

stimulate glycolysis and gluconeogenesis

stimulate glycolysis and inhibit gluconeogenesis

inhibit glycolysis and stimulate gluconeogenesis

[#]

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