Biochemistry MCQs- JUNE 09

Question

THE CARBOHYDRATE RIBOSE CONTAINS HOW MANY CARBON ATOMS?

Answer 1

Glucose and fructose

Answer 2

Maltose and glucose

Answer 3

Glucose and galactose

Answer 4

Fructose and galactose

Answer 5

Hydrophobic

Answer 6

Hydrophilic

Answer 7

Amphipathic

Answer 8

Anglophobic

Answer 9

α(1→4) and α(1→6)

Answer 10

β(1→4) and α(1→6)

Answer 11

α(1→4) and β(1→6)

Answer 12

β(1→4) and β(1→6)

Answer 13

Random coil

Answer 14

Nicotinamide

Answer 15

Flavin mononucleotide

Answer 16

Galactose 1-phosphate

Answer 17

Galactose 6-phosphate

Answer 18

Glucose 1-phosphate

Answer 19

Glucose 6-phosphate

Answer 20

Glycolysis

Answer 21

The tricarboxylic acid (Krebs) cycle

Answer 22

Oxidative phosphorylation

Answer 23

Gluconeogenesis

Answer 24

Ethanol via acetic acid

Answer 25

Acetic acid via ethanol

Answer 26

Acetaldehyde (ethanal) via ethanol

Answer 27

Ethanol via acetaldehyde (ethanal)

Answer 28

NADH, oxygen and a proton motive force

Answer 29

NADPH, water and an electromotive force

Answer 30

NADPH, oxygen and a proton motive force

Answer 31

NADH, oxygen and an electromotive force

Answer 32

NADPH, ATP and carbon dioxide

Answer 33

NAD+, ATP and carbon dioxide

Answer 34

NADPH, ADP and oxygen

Answer 35

NADPH, ATP and oxygen

Answer 36

Paper chromatography and synthetic organic chemistry

Answer 37

X-ray crystallography and titrations

Answer 38

Gene sequencing and fluorescence resonance energy transfer

Answer 39

Tissue culture and NMR spectroscopy

Answer 40

Mitochondria

Answer 41

Mitotic spindles

Answer 42

Glycolysis

Answer 43

Tricarboxylic acid cycle

Answer 44

Leloir pathway

Answer 45

Glycogen biosynthesis

Answer 46

Has units of concentration

Answer 47

For a given enzyme is independent of the substrate used

Answer 48

Is a measure of the rate of acceleration carried out by the enzyme

Answer 49

Gives an idea of the enzyme’s catalytic efficiency

Answer 50

Is usually dependant upon hydrogen bonding with at least one amino acid side chain at the active site to facilitate formation of the transition state

Answer 51

Is usually dependant upon hydrogen bonding between the carbonyl and amide groups of peptide bonds to facilitate formation of the transition state

Answer 52

Is usually dependant upon hydrogen bonding between a water molecule and the substrate to facilitate formation of the transition state

Answer 53

Is usually dependant upon hydrogen bonding with an oxidised metal ion prosthetic group in the active site to facilitate formation of the transition state

Answer 54

A catalytic strategy that facilitates transition state stabilisation through formation of covalent bonds between a substrate and amino acid groups in the active site

Answer 55

A catalytic strategy that facilitates transition state stabilisation through formation of hydrogen bonds and electrostatic interactions between a substrate and amino acid groups in the active site

Answer 56

A catalytic strategy that facilitates transition state stabilisation through interaction with metal ions in the active site

Answer 57

A catalytic strategy that facilitates transition state stabilisation through direct transfer of a proton to the substrate from an acidic amino acid group in the active site

Answer 58

A region of the enzyme active site that facilitates binding of positively charged substrates through their association with oxygen-containing amino-acid side chains in the enzyme

Answer 59

A region of the enzyme active site that facilitates binding of negatively charged substrates through their association with oxygen-containing amino-acid side chains in the enzyme

Answer 60

A region of the active site that facilitates binding of positively charged oxygen-containing groups present in a substrate

Answer 61

A region of the active site that facilitates binding of negatively charged oxygen-containing groups present in a substrate

Answer 62

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

Answer 63

Is a polypeptide

Answer 64

Is an essential component of eukaryote respiratory chains

Answer 65

Can be covalently linked to proteins via isopeptide bond formation

Answer 66

Is controlled by serine protease enzymes.

Answer 67

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

Answer 68

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

Answer 69

Is controlled by ubiquinone activating enzymes.

Answer 70

Is always the rate limiting step in an enzyme catalysed reaction

Answer 71

Is never the rate limiting step in an enzyme catalysed reaction

Answer 72

Is always a necessary pre-requisite to formation of the transition state and therefore product turnover

Answer 73

Is never a necessary pre-requisite to formation of the transition state and therefore product turnover

Answer 74

May explain why enzymes have particular substrate specificity

Answer 75

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

Answer 76

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

Answer 77

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

Answer 78

Can be described by the ratio: kcat/Km

Answer 79

Can be described by the ratio: Km/kcat

Answer 80

Can be described by the ratio: Vmax/kcat

Answer 81

Can be described by the ratio: kcat/Vmax

Answer 82

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

Answer 83

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 84

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 85

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

Answer 86

A glycolytic intermediate

Answer 87

The precursor of glyceraldehyde 3-phosphate and dihydroxyacetone phosphate

Answer 88

Produced from fructose 2-phosphate

Answer 89

A second messenger

Answer 90

Caused by an excess of ATP in the cytoplasm

Answer 91

Due to its synthesis being coupled to ATP hydrolysis

Answer 92

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

Answer 93

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

Answer 94

Decreased glycolytic flux by allosteric stimulation of lactate dehydrogenase

Answer 95

Allosteric inhibition of fructose 1,6-bisphosphatase

Answer 96

Allosteric inhibition of phosphofructokinase-1

Answer 97

Increased glycolytic flux by allosteric activation of phosphofructokinase-2

Answer 98

The term used to describe the inhibition of glycolysis in anaerobic cells that occurs when oxygen is supplied

Answer 99

Caused (in some cancers) by a defect in the glycerol phosphate shuttle

Answer 100

Caused by an over-active glycerol phosphate shuttle in cancer

Answer 101

Due to the inhibition of phosphofructokinase-1 by NADH

Answer 102

Body fluids

Answer 103

Blood pressure

Answer 104

Body temperature

Answer 105

They generate most of their heat through internal processes

Answer 106

They get most of their heat from the environment

Answer 107

They generate most of their heat from external processes

Answer 108

They cannot regulate their body temperature

Answer 109

Initial substrates which feed into metabolic pathways

Answer 110

Compounds which catalyse the individual steps in a metabolic pathway

Answer 111

Compounds which occur at cross-over or branching points in metabolic pathways

Answer 112

Metabolic hubs which allow the use and re-use of relatively small numbers of molecules

Answer 113

Amphibolic

Answer 114

Hyperbolic

Answer 115

Positive feedback

Answer 116

Formative feedback

Answer 117

Negative feedback

Answer 118

Neutral feedback

	Criado por MatthewEllis96 aproximadamente 9 anos atrás

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Biochemistry MCQs- JUNE 09

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