Biochemistry MCQs- MAY 11

Question

SUCROSE IS SYNTHESISED BY WHICH OF THESE GROUPS OF ORGANISMS?

Answer 1

Glucose, Fructose, Mannose

Answer 2

Sucrose, Fructose, Ribose

Answer 3

Mannose, Galactose, Glucose

Answer 4

Sucrose, Mannose, Glucose

Answer 5

A sodium ion

Answer 6

A chloride ion

Answer 7

Glyceraldehyde

Answer 8

Dihydroxyacetone

Answer 9

UDP-glucose

Answer 10

Glucose 6-phosphate

Answer 11

Galactose 1-phosphate

Answer 12

Galactose 2-phosphate

Answer 13

Galactose 4-phosphate

Answer 14

Galactose 6-phosphate

Answer 15

No molecules

Answer 16

Two molecules

Answer 17

Four molecules

Answer 18

Six molecules

Answer 19

Acetyl Coenzyme A (AcCoA)

Answer 20

Phosphoenolpyruvate

Answer 21

Acetyl CoA

Answer 22

Carbon dioxide (CO2)

Answer 23

α(1→2) glycosidic links

Answer 24

α(1→6) glycosidic links

Answer 25

β(1→2) glycosidic links

Answer 26

β(1→6) glycosidic links

Answer 27

It competitively inhibits succinate dehydrogenase

Answer 28

It blocks the oxygen binding site in cytochrome c oxidase

Answer 29

It reacts with ATP

Answer 30

It prevents cell membranes from forming

Answer 31

To provide a source of energy for the cells

Answer 32

To shield the cells from heat from the lights

Answer 33

To kill the cells so that the reaction was stopped

Answer 34

To separate the products on paper chromatography

Answer 35

In aqueous solution, not in complex with any other molecules

Answer 36

In complex with carbohydrates

Answer 37

In complex with cholesterol

Answer 38

In complex with proteins

Answer 39

Has no effect on the fluidity of cell membranes

Answer 40

Can only increase the fluidity of cell membranes

Answer 41

Can only decrease the fluidity of cell membranes

Answer 42

Can increase or decrease the fluidity of cell membranes

Answer 43

Reduce the entropy associated with chemical reactions

Answer 44

Reduce the enthalpy associated with chemical reactions

Answer 45

Reduce the Gibb‟s free energy associated with chemical reactions

Answer 46

Reduce the activation energy associated with chemical reactions

Answer 47

May explain why enzymes have particular substrate specificity.

Answer 48

May explain why enzymes are able to catalyse chemical reactions that cannot be facilitated in any other way

Answer 49

May explain why enzymes increase the rate of a reaction by reduction of the activation energy change for the reaction

Answer 50

May explain why enzymes can effectively reduce the loss of energy from a chemical reaction as heat

Answer 51

Half of Vmax

Answer 52

Two thirds of Vmax

Answer 53

Double Vmax

Answer 54

Three times Vmax

Answer 55

Is easily observed through Michaelis-Menten kinetic experiments

Answer 56

Is sometimes present in Michaelis-Menten kinetic experiments

Answer 57

Is a concept used to explain the results of Michaelis-Menten kinetic experiments

Answer 58

Is completely irrelevant to Michaelis-Menten kinetic experiments

Answer 59

An acidic- or basic- amino acid in the active site of an enzyme facilitates transition state formation by hydrogen abstraction from an appropriate substrate.

Answer 60

An acid- or basic- substrate in the active sit of an enzyme facilitates transition state formation by hydrogen abstraction from a catalytic amino acid in the active site.

Answer 61

Both are correct.

Answer 62

Neither are correct.

Answer 63

Can be described by the ratio: kCAT/KM

Answer 64

Can be described by the ratio: KM/kCAT

Answer 65

Can be described by the ratio: Vmax/kCAT

Answer 66

Can be described by the ratio: kCAT/Vmax

Answer 67

A catalytic mechanism that facilitates transition state formation by covalent interactions.

Answer 68

A catalytic mechanism that facilitates substrate-enzyme complex formation by covalent interactions.

Answer 69

A catalytic mechanism that facilitates transition state formation by non-covalent interactions.

Answer 70

A catalytic mechanism that facilitates substrate-enzyme complex formation by non-covalent interactions.

Answer 71

Is controlled by serine protease enzymes.

Answer 72

Is a key part of the control mechanism in the eukarote cell cycle

Answer 73

Is a key part of the control mechanism in the prokarote cell cycle

Answer 74

Is controlled by ubiquinone activating enzymes.

Answer 75

Is completely located in the mitochondrial matrix – preventing the exposure of free ammonium to other components of the eukaryote cell.

Answer 76

Allows free ammonia obtained directly from deamination of glutamate to be converted to urea – preventing the exposure of free ammonium to other components of the eukaryote cell.

Answer 77

Allows free ammonia obtained directly from deamination of tryptophan to be converted to urea – preventing the exposure of free ammonium to other components of the eukaryote cell.

Answer 78

Is completely located in the cytoplasm of the cell – preventing the exposure of free ammonium to other components of the eukaryote cell.

Answer 79

Can be covalently linked to proteins via the N-terminus glycine residue.

Answer 80

Is a polypeptide.

Answer 81

Is an essential component of eukaryote respiratory chains.

Answer 82

Can be covalently linked to proteins via isopeptide bond formation.

Answer 83

The reaction will stop

Answer 84

The reaction will proceed spontaneously from left to right.

Answer 85

The reaction will never reach equilibrium.

Answer 86

The reaction will not occur spontaneously.

Answer 87

Biosynthesis of NADPH

Answer 88

Transport of protons by respiratory chain

Answer 89

Oxygen reduction by cytochromec oxidase

Answer 90

Brain activity due to the thinking about this question

Answer 91

Redox potentials can be used to calculate free energy changes

Answer 92

The strongest oxidants have the most negative potential.

Answer 93

Redox potential is measured in millivolts.

Answer 94

Oxygen reduction has a very high potential.

Answer 95

ubiquinol/ubiquinone

Answer 96

NADPH/NADP+

Answer 97

ferrocytochrome c/ferricytochrome c

Answer 98

The inner mitochondrial membrane is positively charged on the inside.

Answer 99

The enzyme ATP-synthase can synthesise ATP.

Answer 100

Electron transfer to O2 is highly exergonic.

Answer 101

The proton motive force can be used for active transport.

Answer 102

Catalysts of the individual steps in a metabolic pathway.

Answer 103

Compounds which are intermediates between reactants and end products

Answer 104

Point at which an intermediate may proceed down one of several alternative pathways

Answer 105

Substrates involved in the metabolic pathway

Answer 106

acquisition and utilisation of energy

Answer 107

synthesis of molecules needed for cell structure and function

Answer 108

growth and development

Answer 109

binding of a hormone to a receptor

Answer 110

It prepares us for strenuous muscular activity

Answer 111

It prepares us for relaxing (non-strenuous) activity

Answer 112

It is one of 3 autonomic nervous systems

Answer 113

It is a part of the endocrine system

Answer 114

Thyroid gland

Answer 115

Parathyroid gland

Answer 116

Pituitary gland

Answer 117

A lack of insulin

Answer 118

A lack of ADH

Answer 119

A lack of oxytocin

Answer 120

An excess of insulin

Answer 121

stimulated by citrate

Answer 122

inhibited by AMP

Answer 123

inhibited by citrate

Answer 124

inhibited by fructose 2,6-bisphosphate

Answer 125

inhibited by ATP

Answer 126

stimulated by fructose 2,6-bisphosphate inhibited by AMP

Answer 127

stimulated by fructose 1,6-bisphosphate

Answer 128

inhibited by AMP

Answer 129

caused by an increase in ATP levels in the muscle cell

Answer 130

caused by an increase in AMP levels in the muscle cell

Answer 131

due to pyruvate being oxidised by lactate dehydrogenase to allow recycling of NAD+ to NADH

Answer 132

due to pyruvate being reduced by lactate dehydrogenase to allow recycling of NADH to NAD+

Answer 133

is activated by 5'AMP

Answer 134

phosphorylates glycogen phosphorylase

Answer 135

is activated by cyclic AMP

Answer 136

phosphorylates fructose bisphosphatase-1

Answer 137

is responsible for transferring NADH from the cytosol to the mitochondrion matrix

Answer 138

is responsible for transferring ATP from the cytosol to the mitochondrion matrix

Answer 139

transfers reducing potential from cytosolic NADH to the mitochondrion

Answer 140

transfers reducing potential from cytosolic ATP to the mitochondrion

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Biochemistry MCQs- MAY 11

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