Copiar y Editar

Biochemistry MCQs- JUNE 09

Descripción

Test sobre Biochemistry MCQs- JUNE 09, creado por MatthewEllis96 el 03/02/2015.
MatthewEllis96
Test por MatthewEllis96, actualizado hace más de 1 año
MatthewEllis96
Creado por MatthewEllis96 hace casi 10 años
42
0
0

Resumen del Recurso

Pregunta 1

Pregunta
THE CARBOHYDRATE RIBOSE CONTAINS HOW MANY CARBON ATOMS?
Respuesta
  • 3
  • 4
  • 5
  • 6

Pregunta 2

Pregunta
SUCROSE IS A DISACCHARIDE OF:
Respuesta
  • Glucose and fructose
  • Maltose and glucose
  • Glucose and galactose
  • Fructose and galactose

Pregunta 3

Pregunta
THE BEST DESCRIPTION FOR FATTY ACIDS IS:
Respuesta
  • Hydrophobic
  • Hydrophilic
  • Amphipathic
  • Anglophobic

Pregunta 4

Pregunta
GLYCOGEN CONTAINS WHICH TYPES OF GLYCOSIDIC BONDS BETWEEN GLUCOSE RESIDUES?
Respuesta
  • α(1→4) and α(1→6)
  • β(1→4) and α(1→6)
  • α(1→4) and β(1→6)
  • β(1→4) and β(1→6)

Pregunta 5

Pregunta
THE CONFORMATION OF THE POLYSACCHARIDE CHAINS IN CELLULOSE IS NORMALLY:
Respuesta
  • Helical
  • Random coil
  • Zig-zag
  • Linear

Pregunta 6

Pregunta
THE REDOX CENTRE IN NAD+ IS:
Respuesta
  • Nicotine
  • Nicotinamide
  • Flavin mononucleotide
  • Flavinoid

Pregunta 7

Pregunta
WHICH NUCLEOTIDE TRIPHOSPHATE IS COMMONLY INVOLVED IN RIBOSOMAL TRANSLOCATION AND SIGNAL TRANSDUCTION?
Respuesta
  • CTP
  • TTP
  • UTP
  • GTP

Pregunta 8

Pregunta
IN LIVING CELLS, ATP IS USUALLY FOUND IN COMPLEX WITH WHICH ION?
Respuesta
  • Na+
  • Ca2+
  • Hg2+
  • Mg2+

Pregunta 9

Pregunta
IN THE LELOIR PATHWAY OF GALACTOSE METABOLISM, GALACTOSE IS PHOSPHORYLATED TO GIVE:
Respuesta
  • Galactose 1-phosphate
  • Galactose 6-phosphate
  • Glucose 1-phosphate
  • Glucose 6-phosphate

Pregunta 10

Pregunta
THE MAIN CARBOHYDRATE “FUEL” OF SPERM CELLS IS:
Respuesta
  • Glucose
  • Galactose
  • Fructose
  • Maltose

Pregunta 11

Pregunta
WHICH PATHWAY RESULTS IN THE GREATEST OVERALL DIRECT GENERATION OF ATP UNDER AEROBIC CONDITIONS?
Respuesta
  • Glycolysis
  • The tricarboxylic acid (Krebs) cycle
  • Oxidative phosphorylation
  • Gluconeogenesis

Pregunta 12

Pregunta
FOR THE COMPLETE OXIDATIVE METABOLISM OF ONE MOLECULE OF GLUCOSE UNDER AEROBIC CONDITIONS, HOW MANY TIMES DOES THE TRICARBOXYLIC ACID CYCLE “TURN”?
Respuesta
  • 0
  • 1
  • 2
  • 4

Pregunta 13

Pregunta
FOR EACH MOLECULE OF ACETYL COENZYME A (AcCoA) WHICH ENTERS THE TRICARBOXYLIC ACID CYCLE, HOW MANY MOLECULES OF CARBON DIOXIDE ARE RELEASED?
Respuesta
  • 0
  • 1
  • 2
  • 4

Pregunta 14

Pregunta
UNDER ANAEROBIC CONDITIONS, YEAST METABOLISE GLUCOSE TO:
Respuesta
  • Ethanol via acetic acid
  • Acetic acid via ethanol
  • Acetaldehyde (ethanal) via ethanol
  • Ethanol via acetaldehyde (ethanal)

Pregunta 15

Pregunta
THE PRODUCTS OF THE LIGHT REACTIONS OF PHOTOSYNTHESIS IN GREEN PLANTS INCLUDE:
Respuesta
  • NADH, oxygen and a proton motive force
  • NADPH, water and an electromotive force
  • NADPH, oxygen and a proton motive force
  • NADH, oxygen and an electromotive force

Pregunta 16

Pregunta
THE “DARK” REACTIONS OF PHOTOSYNTHESIS IN GREEN PLANTS REQUIRE:
Respuesta
  • NADPH, ATP and carbon dioxide
  • NAD+, ATP and carbon dioxide
  • NADPH, ADP and oxygen
  • NADPH, ATP and oxygen

Pregunta 17

Pregunta
TWO METHODOLOGIES USED BY MELVIN CALVIN TO ELUCIDATE THE “DARK” REACTIONS OF PHOTOSYNTHESIS WERE:
Respuesta
  • Paper chromatography and synthetic organic chemistry
  • X-ray crystallography and titrations
  • Gene sequencing and fluorescence resonance energy transfer
  • Tissue culture and NMR spectroscopy

Pregunta 18

Pregunta
WHICH OF THESE COFACTORS IS NEEDED FOR THE SYNTHESIS OF MALONYL COENZYME A FROM ACETYL COENZYME A AND CARBON DIOXIDE?
Respuesta
  • Niacin
  • NAD+
  • Thiamine
  • Biotin

Pregunta 19

Pregunta
IN WATER, FATTY ACIDS CAN SPONTANEOUSLY ASSEMBLE INTO WHAT STRUCTURES?v
Respuesta
  • Micelles
  • Mitochondria
  • Mitotic spindles
  • Myosin

Pregunta 20

Pregunta
MALONATE INHIBITS AN ENZYME IN WHICH METABOLIC PATHWAY?
Respuesta
  • Glycolysis
  • Tricarboxylic acid cycle
  • Leloir pathway
  • Glycogen biosynthesis

Pregunta 21

Pregunta
THE MICHAELIS CONSTANT, Km:
Respuesta
  • Has units of concentration
  • For a given enzyme is independent of the substrate used
  • Is a measure of the rate of acceleration carried out by the enzyme
  • Gives an idea of the enzyme’s catalytic efficiency

Pregunta 22

Pregunta
WHEN CONSIDERING ENZYME CATALYTIC MECHANISMS, ACID-BASE CATALYSIS:
Respuesta
  • 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
  • Is usually dependant upon hydrogen bonding between the carbonyl and amide groups of peptide bonds to facilitate formation of the transition state
  • Is usually dependant upon hydrogen bonding between a water molecule and the substrate to facilitate formation of the transition state
  • Is usually dependant upon hydrogen bonding with an oxidised metal ion prosthetic group in the active site to facilitate formation of the transition state

Pregunta 23

Pregunta
IN ENZYME CATALYSIS THE TERM “APPROXIMATION” REFERS TO:
Respuesta
  • A catalytic strategy that facilitates transition state stabilisation through formation of covalent bonds between a substrate and amino acid groups in the active site
  • 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
  • A catalytic strategy that facilitates transition state stabilisation through interaction with metal ions in the active site
  • 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

Pregunta 24

Pregunta
AN OXYANION HOLE IS:
Respuesta
  • 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
  • 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
  • A region of the active site that facilitates binding of positively charged oxygen-containing groups present in a substrate
  • A region of the active site that facilitates binding of negatively charged oxygen-containing groups present in a substrate

Pregunta 25

Pregunta
THE PROTEIN UBIQUITIN:
Respuesta
  • Can be covalently linked to proteins via the N-terminal glycine residue
  • Is a polypeptide
  • Is an essential component of eukaryote respiratory chains
  • Can be covalently linked to proteins via isopeptide bond formation

Pregunta 26

Pregunta
PROTEOSOME-MEDIATED PROTEOLYSIS:
Respuesta
  • Is controlled by serine protease enzymes.
  • Is a key part of the control mechanism in the eukarote cell cycle
  • Is a key part of the control mechanism in the prokarote cell cycle
  • Is controlled by ubiquinone activating enzymes.

Pregunta 27

Pregunta
IN MICHAELIS-MENTON KINETICS, FORMATION OF THE ENZYME-SUBSTRATE COMPLEX:
Respuesta
  • Is always the rate limiting step in an enzyme catalysed reaction
  • Is never the rate limiting step in an enzyme catalysed reaction
  • Is always a necessary pre-requisite to formation of the transition state and therefore product turnover
  • Is never a necessary pre-requisite to formation of the transition state and therefore product turnover

Pregunta 28

Pregunta
THE TRANSITION STATE MODEL FOR ENZYME CATALYSIS:
Respuesta
  • May explain why enzymes have particular substrate specificity
  • May explain why enzymes are able to catalyse chemical reactions that cannot be facilitated in any other way
  • May explain why enzymes increase the rate of a reaction by reduction of the activation energy change for the reaction
  • May explain why enzymes can effectively reduce the loss of energy from a chemical reaction as heat

Pregunta 29

Pregunta
THE CATALYTIC EFFICIENCY OF AN ENZYME CATALYSED REACTION:
Respuesta
  • Can be described by the ratio: kcat/Km
  • Can be described by the ratio: Km/kcat
  • Can be described by the ratio: Vmax/kcat
  • Can be described by the ratio: kcat/Vmax

Pregunta 30

Pregunta
THE UREA CYCLE:
Respuesta
  • Is completely located in the mitochondrial matrix – preventing the exposure of free ammonium to other components of the eukaryote cell
  • 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
  • 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
  • Is completely located in the cytoplasm of the cell – preventing the exposure of free ammonium to other components of the eukaryote cell

Pregunta 31

Pregunta
FRUCTOSE 2,6-BISPHOSPHATE IS:
Respuesta
  • A glycolytic intermediate
  • The precursor of glyceraldehyde 3-phosphate and dihydroxyacetone phosphate
  • Produced from fructose 2-phosphate
  • A second messenger

Pregunta 32

Pregunta
THE BUILD UP OF LACTIC ACID IN MUSCLES AFTER ANAEROBIC EXERCISE IS:
Respuesta
  • Caused by an excess of ATP in the cytoplasm
  • Due to its synthesis being coupled to ATP hydrolysis
  • Due to pyruvate being reduced by lactate dehydrogenase to allow recycling of NADH to NAD+
  • Due to pyruvate being oxidised by lactate dehydrogenase to allow recycling of NAD+ to NADH

Pregunta 33

Pregunta
THE INCREASE IN ATP LEVELS THAT ACCOMPANIES THE "PASTEUR EFFECT" CAUSES:
Respuesta
  • Decreased glycolytic flux by allosteric stimulation of lactate dehydrogenase
  • Allosteric inhibition of fructose 1,6-bisphosphatase
  • Allosteric inhibition of phosphofructokinase-1
  • Increased glycolytic flux by allosteric activation of phosphofructokinase-2

Pregunta 34

Pregunta
PROTEIN KINASE A IS ACTIVATED BY:
Respuesta
  • 5'-AMP
  • cAMP
  • ADP
  • NADH

Pregunta 35

Pregunta
THE WARBURG EFFECT IS:
Respuesta
  • The term used to describe the inhibition of glycolysis in anaerobic cells that occurs when oxygen is supplied
  • Caused (in some cancers) by a defect in the glycerol phosphate shuttle
  • Caused by an over-active glycerol phosphate shuttle in cancer
  • Due to the inhibition of phosphofructokinase-1 by NADH

Pregunta 36

Pregunta
THE RENIN-ANGIOTENSIN SYSTEM HELPS REGULATE:
Respuesta
  • Body fluids
  • Blood pressure
  • Body temperature
  • Breathing

Pregunta 37

Pregunta
WHICH OF THE FOLLOWING IS TRUE OF ECTOTHERMS?
Respuesta
  • They generate most of their heat through internal processes
  • They get most of their heat from the environment
  • They generate most of their heat from external processes
  • They cannot regulate their body temperature

Pregunta 38

Pregunta
IN BIOCHEMICAL PATHWAYS THE COMMON INTERMEDIATES ARE:
Respuesta
  • Initial substrates which feed into metabolic pathways
  • Compounds which catalyse the individual steps in a metabolic pathway
  • Compounds which occur at cross-over or branching points in metabolic pathways
  • Metabolic hubs which allow the use and re-use of relatively small numbers of molecules

Pregunta 39

Pregunta
THE KREBS (OR TCA) CYCLE IS AN EXAMPLE OF WHICH TYPE OF PATHWAY?
Respuesta
  • Anabolic
  • Catabolic
  • Amphibolic
  • Hyperbolic

Pregunta 40

Pregunta
WHICH OF THESE SYSTEMS IS MOST COMMON IN BIOLOGICAL SYSTEMS?
Respuesta
  • Positive feedback
  • Formative feedback
  • Negative feedback
  • Neutral feedback
Mostrar resumen completo Ocultar resumen completo

¿Quieres crear tus propios Tests gratis con GoConqr? Más información.

Similar

Cómo crear un Mapa Mental
maya velasquez
Capitales Europeas
Diego Santos
Listenings para el FCE
Diego Santos
La prehistoria
Remei Gomez Gracia
Leyes de Kirchhoff (Voltaje y corriente)
dianamardp
Literatura: Obras y Autores
Diego Santos
PINTURAS FAMOSAS: Título y Autor...
Ulises Yo
TIPOS DE COMPUTADORAS
jesus-paopao
TIC APLICADA A LA EDUCACIÓN INICIAL
rosita_20_13
Promoción de ventas
VICTOR HUGO ORTIZ ALCALA
Bloque 1 Clase Resto Materias
Alvaro Valladares
Explorar la Librería