Biochemistry MCQs- MAY 10

Question

WHICH OF THESE LISTS CONTAINS ONLY MONOSACCHARIDES?

Answer 1

Glucose, galactose, fructose

Answer 2

Sucrose, lactose, mannose

Answer 3

Glucose, galactose, lactose

Answer 4

Glucose, galactose, sucrose

Answer 5

Cancer cells

Answer 6

All of the above

Answer 7

Aldehyde and amine

Answer 8

Amine and ketone

Answer 9

Ketone and alcohol

Answer 10

Amine and alcohol

Answer 11

No molecules

Answer 12

2 molecules

Answer 13

4 molecules

Answer 14

8 molecules

Answer 15

Associated with integral membrane proteins

Answer 16

Covalently linked to lipid molecules

Answer 17

Always glycosylated

Answer 18

Inserted into the membrane such that they have residues exposed on both sides

Answer 19

Very different, even in closely related organisms

Answer 20

Similar in different mammals, but different between mammals and the bacteria living in their guts

Answer 21

Similar in all animals, but different in plants

Answer 22

Highly conserved through evolution by natural selection

Answer 23

Uses sucrose and NADPH

Answer 24

Generates sucrose and NADPH

Answer 25

Uses sucrose and generates NADPH

Answer 26

Generates sucrose and uses NADPH

Answer 27

18 molecules of CoA

Answer 28

18 molecules of acetyl-CoA

Answer 29

9 molecules of CoA

Answer 30

9 molecules of acetyl-CoA

Answer 31

An 18 carbon saturated fatty acid

Answer 32

An 18 carbon fatty acid with one double bond

Answer 33

A 16 carbon saturated fatty acid

Answer 34

A 16 carbon fatty acid with two double bonds

Answer 35

Deoxyribose

Answer 36

ATP and NAD+

Answer 37

Inorganic phosphate ions (Pi) and NADH

Answer 38

Inorganic phosphate ions (Pi) and NAD+

Answer 39

ATP and NADH

Answer 40

Fructose 1,6-bisphosphate → Glyceraldehyde 3-phosphate + dihydroxyacetone phosphate

Answer 41

Pyruvate → Acetyl Coenzyme A

Answer 42

Citrate → Isocitrate

Answer 43

Isocitrate → α-ketoglutarate

Answer 44

Glycolysis and the Krebs’ tricarboxylic acid cycle

Answer 45

Fatty acid oxidation and glycolysis

Answer 46

Fatty acid oxidation and the Krebs’ tricarboxylic acid cycle

Answer 47

Fatty acid oxidation and the Leloir pathway

Answer 48

Replenishing the Krebs tricarboxylic acid cycle intermediates and gluconeogenesis

Answer 49

Glycolysis and gluconeogenesis

Answer 50

Gluconeogenesis and glycogen synthesis

Answer 51

Replenishing the Krebs tricarboxylic acid cycle intermediates and glycolysis

Answer 52

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

Answer 53

Initial substrates which feed into metabolic pathways

Answer 54

Compounds which catalyse the individual steps in a metabolic pathway

Answer 55

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

Answer 56

Amphibolic

Answer 57

Hyperbolic

Answer 58

They generate most of their heat through internal processes

Answer 59

They get most of their heat from the environment

Answer 60

They generate most of their heat from external processes

Answer 61

They cannot regulate their body temperature

Answer 62

Body fluids

Answer 63

Blood calcium

Answer 64

Body temperature

Answer 65

A build up of substrates

Answer 66

A build up of end-products

Answer 67

Over-activation of enzymes

Answer 68

Synthesis of new enzymes

Answer 69

Activates fructose bisphosphatase-1

Answer 70

Activates phosphofructokinase-1

Answer 71

Inhibits phosphofructokinase-2

Answer 72

Activates phosphofructokinase-2

Answer 73

NADH to NAD+ via the action of lactate dehydrogenase

Answer 74

NADH to NAD+ via the action of alcohol dehydrogenase

Answer 75

NAD+ to NADH via the action of lactate dehydrogenase

Answer 76

NAD+ to NADH via the action of alcohol dehydrogenase

Answer 77

Allosteric inhibition of phosphofructokinase-1 by increased AMP levels

Answer 78

Allosteric inhibition of fructose 1,6-bisphosphatase by increased ATP levels

Answer 79

Allosteric inhibition of phosphofructokinase-1 by increased ATP levels

Answer 80

Allosteric stimulation of phosphofructokinase-1 by increased AMP levels

Answer 81

An activator of pyruvate kinase

Answer 82

An activator of protein kinase A

Answer 83

The product of adenylate kinase

Answer 84

An activator of phosphofructokinase-1

Answer 85

Lack mitochondria

Answer 86

Lack the gene for citrate synthase

Answer 87

Possess an over-active glycerol phosphate shuttle

Answer 88

Have a defective glycerol phosphate shuttle

Answer 89

Hydrogen bonding with at least one amino acid side chain at the active site to facilitate formation of the transition state.

Answer 90

Hydrogen bonding between the carbonyl and amide groups of peptide bonds to facilitate formation of the transition state.

Answer 91

Hydrogen bonding between a water molecule and the substrate to facilitate formation of the transition state.

Answer 92

Hydrogen bonding with an oxidised metal ion prosthetic group in the active site to facilitate formation of the transition state.

Answer 93

Inhibits proteosome-mediated protein degradation

Answer 94

Is essential for proteosome-mediated protein degradation

Answer 95

Enhances proteosome-mediated protein degradation

Answer 96

Has nothing to do with proteosome-mediated protein degradation

Answer 97

Entropy associated with chemical reactions

Answer 98

Enthalpy associated with chemical reactions

Answer 99

Gibb’s free energy associated with chemical reactions

Answer 100

Activation energy associated with chemical reactions

Answer 101

Is always covalently associated with the enzyme.

Answer 102

Is never covalently associated with the enzyme.

Answer 103

Can never be observed experimentally.

Answer 104

Can often be similar in structure to potent enzyme inhibitors.

Answer 105

Is completely located in the mitochondrial matrix.

Answer 106

Facilitates transport of ammonia produced in the liver to the muscles where it can be used in anabolic processes - preventing the exposure of free ammonium to other components of eukaryote tissues.

Answer 107

Facilitates transport of ammonia produced in the muscles to the liver where it can be effectively removed from the body - preventing the exposure of free ammonium to other components of eukaryote tissues.

Answer 108

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

Answer 109

Enzymes have particular substrate specificity.

Answer 110

Enzymes are able to catalyse chemical reactions that cannot be facilitated in any other way

Answer 111

Enzymes increase the rate of a reaction by reduction of the activation energy change for the reaction

Answer 112

Enzymes can effectively reduce the loss of energy from a chemical reaction as heat

Answer 113

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 114

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 115

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

Answer 116

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 117

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 118

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 119

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

Answer 120

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

Answer 121

The reaction will stop

Answer 122

The reaction will proceed spontaneously from B to A

Answer 123

The reaction will proceed spontaneously from A to B

Answer 124

The reaction will not occur spontaneously

Answer 125

Biosynthesis of DNA

Answer 126

Glycolysis

Answer 127

Transport of protons by respiratory chain

Answer 128

Brain activity due to the thinking about this question

Answer 129

This reaction can only occur in a cell in which NADH is converted to NAD+ by the respiratory chain

Answer 130

This reaction can only occur in a cell if it is coupled to another reaction for which ΔG°' is large and negative

Answer 131

This reaction may occur in cells at some concentrations of substrate and product

Answer 132

This reaction is energy-releasing

Answer 133

Redox potentials can be used to calculate free energy changes

Answer 134

Redox potential is measured in volts

Answer 135

Oxygen reduction has the highest potential

Answer 136

The strongest oxidants have the most negative potential

Answer 137

Plastoquinol/plastoquinone

Answer 138

Ferrocytochrome c/ferricytochrome c

	Criado por MatthewEllis96 quase 10 anos atrás

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Biochemistry MCQs- MAY 10

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