MDCAT BIOLOGY-Biological Molecules (SMART INSTITUTE)

01-These are the most abundant organic compounds to be found in cells:

Carbohydrates

Proteins

Lipids

Water

02-What does a hemoglobin molecule contains?

Four Fe+2 attached to each haem group

Four oxygen molecules attached to each haem group

Four polypeptide chains each with four attached haem groups

Four polypeptide chains each with one attached haem group

03-All of the following elements are present in all carbohydrates except:

Carbon

Oxygen

Hydrogen

Nitrogen

04-Which term most appropriately describes catalase, collagen and haemoglobin?

Enzymes

Fibrous proteins

Globular proteins

Polypeptides

05-Which property of proteins enables them to act as pH buffers?

They are soluble

They contain carboxyl and amino groups

They have a high molecular mass

They posses both secondary and tertiary structure

06.......... Has unbranched chains of glucose and is soluble in hot water.

Amylose

Amylopectin

Glycogen

Cellulose

07-Silk protein is not present in:

Silk clothes

Silk worms

Hair

Spider's web

08-All of the following are true about lipids except?

They store high amount of energy

They play important role in insulation

They are polymers of fatty acids

They are mostly hydrophobic in nature

09-Sucrose is non-reducing due to:

1,4-Glycosidic bond between two glucose

1,2-Glycosidic bond between glucose and fructose

1,2-Glycosidic bond between two glucose

1,4-Glycosidic bond between glucose and fructose

10-Cuticle is an example of

Acylglycerols

Phospholipids

Waxes

Terpenoid

11-Which of these is not constituent of waxes?

Long chain alkanes

Aldehydes

Alcohols

Ketones

12-A group of lipids that does not contain fatty acids:

Acylglycerols

Phospholipids

Waxes

Terpenoids

13-All are true about ATP except

Energy currency of cell

Contains three high energy bonds

Contains ribose sugar

Contains three phosphate groups

14-A DNA fragment contains ACGT nucleotide sequence in one strand. How many hydrogen bonds will it make with other strands?

15-Adenine and Guanine are:

Main nitrogenous bases of nucleic acids

Main nitrogenous bases of phospholipids

Main nitrogenous wastes of humans

Main types of amino acids in proteins

16-Secondary structure of DNA duplex is maintained by

Phosphodiester linkage

Ionic bond

Hydrogen bond

Hyperphobic interaction

17. 3' end of nucleic acids have always a free ......... group.

Phosphate

Hydroxyl

Carboxylic

Amino

18-This is not true about DNA molecule:

Double polymer

Secondary structure

One groove in each turn

Constant diameter

19-Form of polysaccharide stored in bacteria and animals:

Starch

Glycogen

Cellulose

Chitin

20-A structural protein is

Pepsin

Hemoglobin

Collagen

Immunoglobulins

21-Which one of the following are single stranded structures?

Cytosine, thymine and adenine

Adenine, guanine and cytosine

Cytosine, guanine and thymine

Cytosine, thymine and uracil

22-Ribose found in genetic material is

Hexose sugar

Pentose sugar

Tetrose

Triose

23-Nitrogenous bases of nucleotides in RNA are attached to

Sugar molecules

Phosphate radicals

Nucleoside

Deoxyribose

24-Cross links of double helix of DNA are formed of:

Sugar molecules

Phosphate radicals

Complementary nitrogen bases

Similar nitrogen bases

25-Regulatory sites other than active sites, present over the enzymes are called

Active sites

Catalytic groups

Binding sites

Allosteric sites

26-Which one is found only in RNA?

Cytosine

Adenine

Uracil

Guanine

27-A monosaccharide is

Lactose

Sucrose

Ribose

Maltose

28-The most common carbohydrate monomer is

Maltose

Lactose

Glucose

Galactose

29-Which forms nails, hair and feathers?

Fibrin

Keratin

Collagen

Elastin

30-DNA is directly involved in the synthesis of all except:

DNA

PROTEIN

TRNA

MRNA

31-Immediate source of energy is

Sucrose

Glucose

Fat

Starch

32-Which one is correct base pairing for DNA molecule?

Cytosine-uracil

Thymine-guanine

Adenine-thymine

Thymine-uracil

33-In one strand of DNA, the base sequence is CATGACTAG. What is the base sequence on the other strand?

CATTAGGAC

GATGTCACT

TACACTTCT

GTACTGATC

34-Number of oxygen atoms in lipid molecules is always .........as compared to number of carbon atoms.

Less

Equal

Double

35-Two amino acids monomers are joined by

Hydrogen bond

Peptide bond

Phosphodiester bond

Ester bond

36-Unsaturated fats are made saturated by:

Polymerization

Hydrogenation

Dehydrogenation

Hybridization

37-A peptide chain attains secondary structure through the formation of

Peptide bond

Ionic bond

Hydrogen bond

Disulphide bond

38-Most abundant carbohydrate in nature is

Cellulose

Starch

Polysaccharides

Glycogen

39-All of the followings yield glucose on complete hydrolysis except:

Starch

Glycogen

Cellulose

Chitin

40-Glucose combines with ..... To form milk sugar

Glucose

Fructose

Galactose

Mannose

41-Formation of trisaccharide involves release of .... Water molecule.

42-How many carbon atoms are present in the ring of fructose?

43-A protein molecule consisting of more than one polypeptide chains belongs to:

Primary structure

Secondary structure

Tertiary structure

Quaternary structure

44-A protein having secondary structure possesses:

Hydrogen bonding

Disulphide bond

Peptide bond

Both hydrogen and peptide

45-All of the following are examples of fibrous proteins except:

Silk fiber

Keratin

Myosin head

Fibrin

46-WOF sugar is most sweet?

Glucose

Sucrose

Fructose

Maltose

47-In aqueous medium, the most stable tertiary conformation is that in which:

Hydrophobic amino acids are buried inside

Hydrophobic amino acids are on the surface

Hydrophilic amino acids are buried inside

Only hydrophilic amino acids are present in it

48-Which of the following is a complex of globular protein with non-proteinaceous material?

Collagen

Albumin

Fibrinogen

Hemoglobin

49-It contains nitrogenous base

Glycogen

ATP

Actin and myosin

Glycogen

50-WOF polysaccharides is present in human muscles abundantly?

Myoglobin

Collagen

Actin and myosin

Glycogen

51-All of following biomolecules are nutritious except

Carbohydrates

Proteins

Lipids

Nucleic acids

52-Muscle hemoglobin possesses

Primary structure

Secondary structure

Tertiary structure

Quaternary structure

53- ................are defensive proteins.

Antigens

Antibodies

Vaccines

Fibrinogen

54-Proteins of hair, horns, feathers and other skin appendages is:

Storage proteins

Enzymatic proteins

Structural protein

Hormonal protein

55-Identify the protein, which cannot be crystallized?

Antibodies

Fibrin

Hemoglobin

Enzymes

57-How many kinds of amino acids are present in the cell?

170

3000

58-WOF amino acid is next to Glycine with respect to the molecular structure?

Alanine

Serine

Ethanolamine

Aspartic acid

59-Pick the odd one:

Cellulose

Galactose

Agar

Pectin

60-WOF carbons are present outside the ring of Fructose?

1st carbon & 2nd carbon

1st carbon & 5th carbon

Only 1st carbon

1st carbon and 6th carbon

MDCAT BIOLOGY-Biological Molecules (SMART INSTITUTE)

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