Online Biochemistry Test - Biochemistry Test - Random

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Total number of questions: 20.
Time allotted: 30 minutes.
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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

[#]

When pO₂ = K_d of myoglobin, the fractional saturation (Y_O2) is about

0.1

0.5

0.9

1.7

[#]

A protein that binds two ligands in a non-cooperative manner will show

a sigmodial binding curve

a hyperbolic binding curve

a linear Scatchard Plot

both (b) and (c)

[#]

Which of the common features are shared between serine and aspartate proteases?

Both require water to complete the catalytic cycle

Both use a base to activate the nucleophile

Both show specificity for certain amino acid sequences

All of the above

[#]

Which of these is a type of specific defense against pathogens?

Lymphocytes

Macrophages

Phagocytes

Leukocytes

[#]

What type of B cell remains dormant in the body, but can respond rapidly if the same antigen appears again?

T cells

Memory cells

Plasma cells

Macrophages

[#]

Papain digest IgG into

two Fab fragments and one Fc fragment

three Fab fragments and two Fc fragments

two Fab fragments and two Fc fragments

three Fab fragments and three Fc fragments

[#]

DiGeorge's syndrome is characterized by the lack of a thymus The mouse model closest to this human disease would be a

knock-out mouse for RAG-1 and RAG-2

knock-out mouse for a thymus

nude mouse

recombinant mouse for CD3

[#]

A nicked RNA molecule can be ligated by

T4 RNA ligase

DNA polymerase

T4 DNA ligase

all of these

[#]

10.

DNA is methylated at

AC sequences

TATA sequences

CAAT sequences

CG sequences

[#]

11.

X-rays cause

the formation of thymine dimers

ionization of water in the cell

heat

none of the above

[#]

12.

An example of a restriction fragment length polymorphism is

an Eco RI cuts DNA at a different sequence than Hind III

different length fragments of DNA resulting from loss or gain of a restriction site

cystic fibrosis results from a three base deletion in most cases but in other cases, other mutations are involved

all of the above

[#]

13.

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

[#]

14.

The maximum energy per gram on oxidization is yielded from

fat

protein

glycogen

starch

[#]

15.

The oxidation of methanol (wood alcohol) in human retina tissue leads directly to the formation of

formaldehyde

sugars

CO₂

none of these

[#]

16.

Cholesterol can be synthesized de novo in

pancreas

intestine

liver

cell membrane

[#]

17.

Why is the TCA cycle the central pathway of metabolism of the cell?

It occurs in the center of the cell

Its intermediates are commonly used by other metabolic reactions

All other metabolic pathways depend upon it

None of the above

[#]

18.

Transamination is the process where

carboxyl group is transferred from amino acid

α-amino group is removed from the amino acid

polymerisation of amino acid takes place

none of the above

[#]

19.

The mineral which aids in the utilization of iron and in hemoglobin synthesis is

calcium

phosphorus

cobalt

copper

[#]

20.

One hypothesis of DNA replication suggested that the parental DNA molecules are broken into fragments. Both strands of DNA in each of the daughter molecules are made up of an assortment of parental and new DNA. This statement refers to which hypothesis?

Conservative theory

Dispersive theory

Semi-conservative theory

Evolutionary theory

[#]

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Online Biochemistry Test - Biochemistry Test - Random

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