MDCAT Biology Entry Test MCQs Test No.6 Past Papers Chapter Wise

MDCAT BIOLOGY ENTRY TEST PAST PAPERS MCQs

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Most abundant organic compound in the cell is

water                           (c) protein  

carbohydrate               (d) lipid  

The main source of energy in the cells are

(a) carbohydrates                    (c) proteins

(b) lipids                                 (d) ATP

Which are esters of fatty acids and alcohol.  

oligosaccharides                     (c) terpenoids

(b) amino acids                       (d) Acylglycerols

Which one is more soluble in organic solvent than others

(a) acetic acid                          (c) Palmitic acid

(b) butyric acid                       (d) Oleic acid   

How many amino acids are constituents of proteins.  

(a) 170                                    (c) 25

(b) 45                                     (d) 20

Oleic acid has double bond between  

(a) C₉ and C₁₀                         (c) C₄ and C₅

(b) C₈ and C₉                           (d) C₁₅ and C₁₆

Glycylalanine is

(a) ester                                  (c) polysaccharide

(b) phospholipid                     (d) dipeptide    

In secondary structure of protein, the helical structure is kept by the formation of

(a) ionic bond             (c) disulphide bond

(b) hydrogen bond      (d) Hydrophobic interaction

Which one acts as a machinery for the synthesis of protein

(a) DNA                                  (c) rRNA

(b) mRNA                               (d) tRNA

In phosphatidic acid the phosphoric acid is attached at carbon number

(a) 1                                         (c) 3

(b) 2                                       (d) 4  

Starches are of

(a) two types                           (c) four types  

(b) three types                         (d) many types   

Most familiar disaccharides is

(a) maltose                              (c) lactose

(b) sucrose                              (d) fructose   

Most common monosaccharides are

(a) Pentoses                 (c) Trioses  

(b) Hexoses                 (d) Pentoses and Hexoses  

Which one is ketosugar  

(a) Glucose                             (c) Ribose

(b) Glyceraldehyde                 (d) fructose   

Adenosine is a

(a) amino acid                         (c) nucleotide

(b) nucleoside                        (d) N₂ base    

Non protein part of enzyme is known as

(a) cofactor                 (c) prosthetic group

(b) coenzyme              (d) apoenzyme    

An activated enzyme consisting of polypeptide chain and a cofactor is known as

(a) Apoenzyme                       (c) Co-enzyme  

(b) prosthetic group                (d) holoenzyme  

Which statement is true about enzyme

(a) they increase the activation energy                      

(c) it is released unaltered after the reaction.   

(b) pepsinogen is powerful and active form of protein digesting enzyme                        

(d) they are involved in feed back inhibition

The charge and shape of the active site is formed by

(a) cofactor                            (c) amino acids

(b) coenzyme                         (d) vitamins

Inhibitors that occupy the active sites by forming covalent bond are

(a) competitive                       (c) irreversible

(b) non-competitive                (d) reversible   

Fumaric acid is a

(a) competitive inhibitor          (c) substrate   

(b) non-competitive inhibitor   (d) product  

Increase of 10C^o temperature what will be effect on the reaction

(a) rate decrease           (c) no effect

(b) rate doubles            (d) ten times increase

The optumum temperature of pepsin is

(a) 2C^o                                    (c) 8C^o   

(b) 4.5C^o                                 (d) 37C^o  

If the enzyme conc. Is kept constant and the amount of substrate is increased then rate of reaction will

(a) increase                 (c) remain constant    

(b) decrease                 (d) no effect  

The effect of slight change in pH is

(a) change of ionization               

(c) breakdown of bonds in substrate    

(b) breakdown of bonds in enzyme

(d) increase of vibrations of atoms  

The inhibitor that form covalent bond to enzymes and destroy their globular structure are

(a) competitive inhibitors        (c) reversible inhibitors  

(b) irreversible inhibitors         (d) irreversible inhibitors  

The products of succinic acid is

(a) Malonic acid                     (c) Fumaric acid  

(b) citric acid                          (d) malic acid

Protein contains

(a) C, H and O                       (c) C, H₂O and O

(b) C, H and P                        (d) C, H, N and O  

Which one base pair is present in RNA

(a) A - T                                 (c) C - G

(b) A - U                                (d) T - A  

Which one is glycosidic bond

(a) C - N                                  (c) C - H

(b) C - O                                  (d) C - C