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biochem sem 1 > mcq - variant 1 > Flashcards

mcq - variant 1 Flashcards

1
Q

which statements is/are correct?

A
  • enzymes can have more than one cofactor
  • all enzymes are proteins
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2
Q

which enzyme/es belong to transferases?

A

aspartate amino transferase
phosphofructokinase

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3
Q

what type of enzyme specificity represents human salivary amylase?

A

bond specificity

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4
Q

ubiquinated enzymes are degraded in:

A

proteosomes

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5
Q

temperature at which enzymes are fully denatured is/are

A

> 70C

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6
Q

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

A

feed forward activation

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7
Q

un-competitive inhibitor

A

binds only to ES complex

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8
Q

negative feedback inhibition

A

is characteristic for enzymes of biosynthesis pathways

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9
Q

which statement/s about regulatory reactions is/are correct

A

these reactions are always reversible
covalent modification can modify regulatory reaction

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10
Q

which statement/s about vitamin B1 is/are correct

A

is a prosthetic group
water soluble

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11
Q

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

A

phospholipase A2
pancreatic elastase

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12
Q

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

A

can be fermented by gut bacteria

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13
Q

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

A

it is inactive in stomach
it ensures minor breakdown of glycogen

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14
Q

which statement/s describe/s chymotrypsin?

A

it is activated by trypsin
enzyme has inactive form - zymogen

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15
Q

which statement/s about colipase is/are correct

A

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

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16
Q

which statement/s about bile is/are correct

A

bile ensures formation of micelles

17
Q

which statement/s about the bile is/are correct

A

bile mostly consists of bile acids

18
Q

in small intestines active absorption with Na+ cotransporters occurs for

A

glucose

19
Q

which statement is/are correct

A

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

20
Q

which enzyme/es belong/s to hydrolases

A

glucoamylase
pepsin

21
Q

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

A

presence of specific activators inhibitors
slight changes in pH of environment

22
Q

why does enzyme activity decrease at high temperature

A

the bond formation is disturbed, thus active site changes conformation

23
Q

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

A

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

24
Q

mixed inhibitor

A

binds only to ES complex

25
Q

feed forward activation is

A

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

26
Q

which statement/s about regulatory reactions is/are correct

A

these reactions are mostly irreversible
allosteric effectors can modify regulatory reaction

27
Q

which statement/s avout vitamin D is/are correct

A

acts as a hormone
accumulates in the body

28
Q

which enzymes/es is/are synthesized in intestines

A

dipeptidase
nucleosidase

29
Q

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

A

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

30
Q

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

A

it cleaves maltose isomer
it ensures water cleavage from molecule

31
Q

which statement/s about carboxypeptidase is/are correct

A

classification is based on substrate preference

32
Q

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

A

it is main enzyme for TAG digestion

33
Q

which statement/s about bile is/are correct

A

bile forms larger lipid droplets

34
Q

which statement/s about bile is/are correct

A

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

35
Q

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

A

Na+ dependent cotransport
facilitiated diffusion

biochem sem 1 (8 decks)

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