mcq - variant 1

Question 1

which statements is/are correct?

Answer 1

• enzymes can have more than one cofactor
• all enzymes are proteins

Question 2

which enzyme/es belong to transferases?

Answer 2

aspartate amino transferase
phosphofructokinase

Question 3

what type of enzyme specificity represents human salivary amylase?

Answer 3

bond specificity

Question 4

ubiquinated enzymes are degraded in:

Answer 4

proteosomes

Question 5

temperature at which enzymes are fully denatured is/are

Answer 5

> 70C

Question 6

use of the triphosphate is characteristic for this/ese type/es of activation:

Answer 6

feed forward activation

Question 7

un-competitive inhibitor

Answer 7

binds only to ES complex

Question 8

negative feedback inhibition

Answer 8

is characteristic for enzymes of biosynthesis pathways

Question 9

which statement/s about regulatory reactions is/are correct

Answer 9

these reactions are always reversible
covalent modification can modify regulatory reaction

Question 10

which statement/s about vitamin B1 is/are correct

Answer 10

is a prosthetic group
water soluble

Question 11

which enzyme/es is/are found in pancreatic juice?

Answer 11

phospholipase A2
pancreatic elastase

Question 12

which statement/s about non-digestable carbohydrates is/are correct?

Answer 12

can be fermented by gut bacteria

Question 13

which statement/s about salivary α-amylase is/are correct

Answer 13

it is inactive in stomach
it ensures minor breakdown of glycogen

Question 14

which statement/s describe/s chymotrypsin?

Answer 14

it is activated by trypsin
enzyme has inactive form - zymogen

Question 15

which statement/s about colipase is/are correct

Answer 15

it stabilizes pancreatic lipase in an active conformation
it is formed from pro-colipase

Question 16

which statement/s about bile is/are correct

Answer 16

bile ensures formation of micelles

Question 17

which statement/s about the bile is/are correct

Answer 17

bile mostly consists of bile acids

Question 18

in small intestines active absorption with Na+ cotransporters occurs for

Answer 18

glucose

Question 19

which statement is/are correct

Answer 19

enzymes can have more than one active allosteric site
metal ions can be cofactors

Question 20

which enzyme/es belong/s to hydrolases

Answer 20

glucoamylase
pepsin

Question 21

which of the factor/s is/are example for quantitative regulation of enzymes

Answer 21

presence of specific activators inhibitors
slight changes in pH of environment

Question 22

why does enzyme activity decrease at high temperature

Answer 22

the bond formation is disturbed, thus active site changes conformation

Question 23

which statement/s is/are true for enzyme activation with proteolytic cleavage

Answer 23

this is the most common type of enzyme activation in human body

Question 24

mixed inhibitor

Answer 24

binds only to ES complex

Question 25

feed forward activation is

Answer 25

characteristic for enzymes of biosynthesis pathways primary ensures production of downstream metabolites

Question 26

which statement/s about regulatory reactions is/are correct

Answer 26

these reactions are mostly irreversible allosteric effectors can modify regulatory reaction

Question 27

which statement/s avout vitamin D is/are correct

Answer 27

acts as a hormone accumulates in the body

Question 28

which enzymes/es is/are synthesized in intestines

Answer 28

dipeptidase nucleosidase

Question 29

which statement/s about non-digestable carbohydrates is/are correct

Answer 29

can act as prebiotics one of the examples is inulin consumption can increase gas production in the gut

Question 30

which of the statement/s about sucrase-isomaltase complex is/are correct

Answer 30

it cleaves maltose isomer it ensures water cleavage from molecule

Question 31

which statement/s about carboxypeptidase is/are correct

Answer 31

classification is based on substrate preference

Question 32

which statement about pancreatic lipase related protein-2 is/are correct

Answer 32

it is main enzyme for TAG digestion

Question 33

which statement/s about bile is/are correct

Answer 33

bile forms larger lipid droplets

Question 34

which statement/s about bile is/are correct

Answer 34

bile mostly consists of water color of the bile is determined by bilirubin the acidic pH of bile is dependent on bile acids

Question 35

by which process monosaccharides are transported into blood circulation through basolateral membrane

Answer 35

Na+ dependent cotransport facilitiated diffusion