Test
CM1512 Deng
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Preguntas del test (45)
1What are the six key types of non-covalent interactions?
- ADispersion forces
- BPermanent dipolar interactions
- CSteric repulsion
- DHydrogen bonds
- EHydrophobic forces
- FIonic interactions
- GVan der Waals
- HPolar bonds
2What is the function of intramolecular forces in polypeptide molecules?
- AHelp the polypeptide chain to adopt the correct three-dimensional structure
- BHelp separate polypeptide molecules to remain associated in a stable way and ensure the protein function
3Tetramer: [blank_start]Intermolecular[blank_end] forces
α-helix : [blank_start]Intramolecular[blank_end] forces- AIntermolecular
- BIntramolecular
- CIntramolecular
- DIntermolecular
4Molecular interactions play an important role in helping biological systems exhibit specificity
- AVerdadero
- BFalso
5Which three molecular interactions form the Van der Waals interaction?
- ADispersion forces
- BPermanent dipolar interactions
- CSteric repulsion
- DIonic forces
- EPolar forces
6What are the characteristics of dispersion forces?
- AStrong
- BWeak
- COperate over short distances
- DShort-lived
- ELong-lived
7What is steric repulsion?
- AThe repulsion of two groups of electrons distributed on the surface of two atoms that hold the same temporary charge
- BThe breaking of bonds in a molecule due to the change in electron number
- CThe accumulation of an electron cloud in an atom
- DNone of the above
8Steric repulsion can occur over short and long distances between atoms
- AVerdadero
- BFalso
9Which atoms are involved in hydrogen bonds?
- ANitrogen
- BOxygen
- CFluorine
- DCarbon
- EChlorine
10The nuclei that participate in the hydrogen bond lie in a straight line
- AVerdadero
- BFalso
11What are some examples of the function of hydrogen bonds in biology?
- AEnables double-stranded DNA to adopt the helical structure
- BNucleic acids
- CProteins
- DEnzyme-substrate complex
- EFree radical function
12Which type of side chain involves hydrogen bonding?
- AAmino
- BCarboxyl
- CCarbonyl
- DBenzene
13Hydrogen bonding also plays a vital role in determining the accuracy of protein synthesis (aka
the process of [blank_start]translation[blank_end])
During the [blank_start]translation[blank_end], a series codons – triplets of the nucleic acid bases that make up an
mRNA strand – are matched to [blank_start]anticodons[blank_end] on [blank_start]tRNA[blank_end] molecules, in a process mediated by the
[blank_start]ribosome[blank_end]
If the [blank_start]anticodon[blank_end] of an incoming [blank_start]tRNA[blank_end] has a sequence complementary to the [blank_start]codon[blank_end] currently
being “read” by the [blank_start]ribosome[blank_end], strong enough [blank_start]hydrogen[blank_end] bonding exist between the codon and
anticondon for the two to remain stably associated for long enough for a biochemical reaction carried by the [blank_start]tRNA[blank_end] to the end of the growing polypeptide- Atranslation
- Btranscription
- Ctranslation
- Dtranscription
- Eanticodons
- Fcodons
- GtRNA
- HmRNA
- IDNA
- Jribosome
- Kgolgi apparatus
- Lanticodon
- Mcodon
- NtRNA
- OmRNA
- PDNA
- Qcodon
- Ranticodon
- Sribosome
- Tgolgi apparatus
- Uhydrogen
- Vionic
- Wintramolecular
- XtRNA
- YmRNA
- ZDNA
14During translation, if the anticodon and codon do not posses complementary sequences, weak hydrogen bonding will occur and their association will not be stable
- AVerdadero
- BFalso
15What are salt bridges?
- AIs composed of a hydrogen bond and an electrostatic interaction
- BIt is a permanent ionic force
- COperates between two oppositely charged amino acid side chains in a protein
- DAll of the above
16Are hydrophilic species polar or non-polar?
- APolar
- BNon-polar
17Are hydrophobic species polar or non-polar?
- APolar
- BNon-polar
18Non-polar species associate readily with water
- AVerdadero
- BFalso
19What can occur with hydrophobic molecules in water?
- AHydrophobic molecules can disrupt the network of hydrogen bonds that
exist in water and so reduce their stability - BThe stability of water is recaptured by the hydrophobic molecules partitioning (separating) to form a separate layer, which has minimal contact with the water
- CBoth answers
- AHydrophobic molecules can disrupt the network of hydrogen bonds that
20Which type of interactions occur with hydrophilic molecules and water, but cannot occur with hydrophobic molecules and water?
- ADipolar interactions
- BVan der Waals
- CIonic interactions
- DNone of the above
21Which process takes place when small charged ions form dipole interactions with polar water molecules?
- AHydration
- BHydrolysis
- CDehydration
- DCondensation
22What is solvation?
- AThe attraction and association of molecules of a solvent molecule or ions of a solute
- BThe process of dissolving a solute in a solvent
- CThe chemical breaking and formation of bonds in water
- DAll of the above
23Which state of matter contains the most non-covalent bonds/ molecular interactions?
- ASolid
- BGas
- CLiquid
24Molecules that participate in few non-covalent interactions have low melting and boiling points as little energy is needed to separate the molecules, and vice versa
- AVerdadero
- BFalso
25What type of force does non-polar compounds experience?
- ADispersion
- BHydrogen
- CDipolar
- DIonic
26What are the three types of energy that have the most influence on a substance?
- AKinetic energy
- BPotential gravitational energy
- CPotential chemical energy
- DHeat energy
- EChemical energy
27What is bond energy?
- AThe amount of energy required to break an ionic or covalent bond to separate two joined atoms
- BThe amount of energy required to break a covalent bond to separate a molecule
- CThe amount of energy required to break an ionic bond to separate two joined atoms
- DThe amount of energy required to break all the intermolecular forces of attraction between two molecules
28Enthalpy is [blank_start]negative[blank_end] for exothermic reactions
Enthalpy is [blank_start]positive[blank_end] for endothermic reactions- Anegative
- Bpositive
- Cpositive
- Dnegative
29Entropy gives a measure of the distribution of energy in a system
- AVerdadero
- BFalso
30When energy is transferred to the system entropy increases and vice versa
- AVerdadero
- BFalso
31For a chemical reaction to be spontaneous, will the total change in entropy be positive or negative?
- APositive
- BNegative
32For a process to occur spontaneously, the entropy of the thermodynamic universe must increase, decrease or remain constant?
- ADecrease
- BIncrease
- CRemain constant
33Are spontaneous processes reversible or irreversible?
- AReversible
- BIrreversible
34What is Gibbs free energy?
- AThe energy that is truly free to do work
- BThe energy transferred as heat to increase entropy
- CThe total energy required for a reaction
35Under standard conditions, what is DG?
- A-394.4 kJ/ mol
- B-347.9 kJ/ mol
- C-200.0 kJ/ mol
- D376.4 kJ/ mol
36For a reaction to be spontaneous, DG must be positive, the products must have higher Gibbs free energy than the reactants
- AVerdadero
- BFalso
37What is the type of reaction called that releases excess Gibbs free energy?
- AExergonic
- BEndergonic
38[blank_start]Catabolic[blank_end] reactions = break down high-energy compounds into simpler molecules
[blank_start]Anabolic[blank_end] reactions = build up more complicated molecules (ie proteins) from simpler subunits- ACatabolic
- BAnabolic
- CAnabolic
- DCatabolic
39For metabolism to occur, there must be the right balance between endergonic catabolic reactions and exergonic anabolic reactions
- AVerdadero
- BFalso
40What is the value of DG for the oxidation of glucose?
- A-2787 kJ/ mol
- B-2800 kJ/ mol
- C-347 kJ/ mol
- D1597 kJ/ mol
41Is the synthesis of ATP endergonic or exergonic?
- AEndergonic
- BExergonic
42Why is ATP structurally unstable?
- ARepulsion between its ionized oxygen atoms
- BLack of hydrogen bonding
- CNo ionic bonding present
43When a reaction is at equilibrium, does the Gibbs free energy increase, decrease or stay the same?
- AIncrease
- BDecrease
- CStay the same
44What is the value of the gas constant?
- A8.31 J/ K/ mol
- B4.78 J/ K/ mol
- C8.71 J/ K/ mol
45The van’t Hoff isotherm and the position of equilibrium
If the value of [blank_start]K < 1[blank_end], then the reaction lies to the left
If the value of [blank_start]K > 1[blank_end], then the reaction lies to the right- AK < 1
- BK > 1
- CK > 1
- DK < 1
Información
- Descripción
- Test sobre CM1512 Deng, creado por Rhona Cummine el 19/04/2016.
- Autor
- Rhona Cummine
- Idioma
- English
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