Quiz on enzymes | quiz 1


#1

QUES 1. The compound which has the lowest density is

Chylomicron

β-Lipoprotein

α-Lipoprotein

pre β-Lipoprotein

QUES 2. Non steroidal anti inflammatory drugs, such as aspirin act by inhibiting the activity of the enzyme:

Lipoxygenase

Phospholipase A2

Cyclooxygenase

Lipoprotein lipase

QUES 3. From arachidonate, synthesis of prostaglandins is catalysed by

Isomerase

Lipoxygenase

Thromboxane synthase

Cyclooxygenase

QUES 4. A Holoenzyme is

Functional unit

Apo enzyme

Coenzyme

All of these

QUES 5. Example of an extracellular enzyme is

Lactate dehydrogenase

Pancreatic lipase

Cytochrome oxidase

Hexokinase

QUES 6. Enzymes, which are produced in inactive form in the living cells, are called

Papain

Lysozymes

Proenzymes

Apoenzymes

QUES 7. An example of ligases is

Succinate thiokinase

Alanine racemase

Fumarase

Aldolase

QUES 8. An example of lyases is

Glutamine synthetase

Cholinesterase

Fumarase

Amylase

QUES 9. Activation or inactivation of certain key regulatory enzymes is accomplished by covalent modification of the amino acid:

Tyrosine

Serine

Lysine

Phenylalanine

QUES 10. Fischer’s ‘lock and key’ model of the enzyme action implies that

The active site is complementary in shape to that of substance

The active site is complementary in shape to that of substance only after interaction.

Substrates change conformation prior to active site interaction

The active site is flexible and adjusts to substrate