Biochemistry BScN Ist Semester

Biochemistry BScN Ist Semester

Mumtaz Ali Khan ([email protected]) WhatsApp: 0340-5210430

Biochemistry BScN Ist Semester

• Fatty acids can be transported

into and out of cell membrane by

• Active transport
• Diffusion
• Facilitated transport
• Osmosis
• Genetic information of nuclear

DNA is transmitted to the site of protein synthesis

• By rRNA
• mRNA
• Polysomes
• tRNA
• Haemoglobin has
• Primary structure
• Quaternery structure
• Secondary structure
• Tertiary structure
• Fibrous protein such as silk

fibroin consists of polypeptide chains arranged in

• α-helix
• β-pleated sheet
• β-helix
• none of these
• Myoglobin is a
• protein with primary

structure

• protein with secondary

structure

• protein with tertiary

structure

• protein with quaternery

structure

• A dipeptide has
• 2 amino acids and 1

peptide bond

• 2 amino acids and 2

peptide bonds

• 2 amino acids and 3

peptide bonds

• 2 amino acids and 4

peptide bonds

• Which of the following

statements about enzymes or their function is true?

• Enzymes do not alter the

overall change in free energy for a reaction

• Enzymes are proteins

whose three-dimensional form is key to their function

• Enzymes speed up

reactions by lowering activation energy

• All of the above
• Strands of DNA are held

together by

• covalent bond
• dipole dipole interaction
• hydrogen bond
• ionic bond
• The function of competitive

inhibitors is defined by their ability to interact or bind to

• Enzyme cofactor

Biochemistry BScN Ist Semester

Mumtaz Ali Khan ([email protected]) WhatsApp: 0340-5210430

• Non-competitive

inhibitor

• Regulatory sub-units of

an enzyme

• The active site of an

enzyme

• The "lock and key hypothesis"

attempts to explain the mechanism of

• Enzyme specificity
• pinocytosis
• sharing of electrons
• vacuole formation
• At high temperature the rate of

enzyme action decreases because the increased heat

• Alters the active site of

the enzyme

• Changes the pH of the

system

• Neutralize acids and

bases in the system

• Increases the

concentration of enzymes

• Some enzymes require the

presence of a non-protein substance if they are to catalyse a reaction. Which of the following terms is the best general term for such a substance?

• Cofactor
• Co-enzyme
• Modulator
• Prosthetic group
• Non-proteinaceous part of

holoenzyme is

• Apoenzyme
• Cofactor
• Prosthetic group
• Tubulin
• In mammals, the major fat in

adipose tissues is

• Phospholipid
• Cholesterol
• Sphingolipids
• Triacylglycerol
• Layer of fat under mammalian

skin acts as an

• Electric insulator
• Protection from germs
• Protection from viruses
• Thermal insulator
• The key enzyme in the

regulation of fatty acid synthesis is

• Acetyl CoA carboxylate
• AMP activated

proteinkinase

• Protein phosphate
• None
• Example of monounsaturated

fatty acid is

• Arachidonic acid
• Linoleic acid
• Oleic acid
• Palmitic acid

Biochemistry BScN Ist Semester

Mumtaz Ali Khan ([email protected]) WhatsApp: 0340-5210430

• The isoelectric point of an

amino acid is defined as the pH

• Of maximum electrolytic

mobility

• Where the molecule

carries no electric charge

• Where the carboxyl

group is uncharged

• Where the amino group

is uncharged

• Enzymes, which are produced in

inactive form in the living cells, are called

• Apoenzymes
• Lysozymes
• Papain
• Proenzymes
• Hormones
• Act as coenzyme
• Act as enzyme
• Belong to B-complex

group

• Influence synthesis of

enzymes

• Hormone that binds to

intracellular receptor is

• Adrenocorticotropic

hormone

• Follicle stimulating

hormone

• Glucagon
• Thyroxine
• An essential agent for

converting glucose to glycogen in liver is

• GTP
• Latic acid
• Pyruvic acid
• UTP
• TSH hormone biochemically is

a

• Carbohydrate
• Fat
• Glycoprotein
• Protein
• Uracil and ribose form
• Adenosine
• Cytidine
• Guanosine
• Uridine
• Enzymes catalyzing electron

transport are present mainly in the

• Endoplasmic reticulum
• Inner mitochondrial

membrane

• Lysosomes
• Ribosomes