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BIOMOLECULES LEC (QUALITATIVE) > 1 > Flashcards

1 Flashcards

1
Q

TRUE OR FALSE:

Double bonds do not rotate, while single covalent bonds rotate freely.

A

FALSE

Single covalent bonds are arranged in tetrahedron that enables it to rotate freely.

Double covalent bonds have planar structure.

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2
Q

It is the measure of the affinity a nucleus has for outer shell electrons.

A

ELECTRONEGATIVITY

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3
Q

Unequal distribution of charge constitutes a

A

Dipole

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4
Q

It is less powerful than hydrogen bonding.

A

Dipole interactions

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5
Q

formed by hydrogen bonds between parallel parts of the protein

A

Beta-pleated sheet

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6
Q

It needs to separate the strands for replication and synthesis of RNA

A

DNA

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7
Q

Binding of substrates in enzyme catalysis

A

PROTEINS

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8
Q
A
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9
Q

Leads to breaking of hydrogen bonds; Denaturation of proteins and separation of strands of nucleic acids

A

HEAT

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10
Q

Protons that can dissociate when dissolved in water

A

ACIDS (DONORS)

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11
Q

It can absorb protons when dissolved in water.

A

BASE (ACCEPTOR)

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12
Q
A
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12
Q
A
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13
Q

It is the interactions between molecules or parts of molecules, and not atoms.

A

HYDROGEN BONDS

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14
Q

Why do hydrogen and carbon do not form significant charges?

A

Because the electronegativities of two atoms are similar.

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15
Q

A negative change in G means

A

release of energy (EXERGONIC REACTION)

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16
Q

positive change in G means

A

absorbs energy (ENDERGONIC REACTION)

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17
Q

FORMULA OF STANDARD GIBBS FREE ENERGY

A

ΔG’° = -RTlnKeq

R is constant = 8.315 J/mol K
T = Kelvin (degree Celcius + 273.16)

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17
Q

TRUE OR FALSE:

Large Values of Keq means unfavorable reaction.

A

FALSE. It is because a large value of Keq is obtained if there are more products are yield. Therefore, if the Keq is high, then it is a favorable reaction.

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18
Q

TRUE OR FALSE:

Ionic and polar compounds dissolve in water.

A

TRUE

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19
Q

TRUE OR FALSE

Non-polar do not dissolve in water.

A

TRUE

20
Q

TRUE OR FALSE

Phospholipids are amphiphilic.

A

TRUE

Because amphiphilic refers to the presence of both polar and non-polar regions. Since a phospholipid bilayer has hydrophilic heads and non-polar tails, they are considered amphiphilic.

21
Q

Non-mixing of hydrophobic molecules are water rooted in the increase in —————- favored in the unmixed state.

A

ENTROPY

22
Q

Spontaneously form lipid bilayer in water

A

GLYCEROPHOSPHOLIPIDS and SPHINGOLIPIDS

23
Q

Help hold the proteins and DNA together

A

Hydrogen bonds

24
Q

TRUE OR FALSE

Hydrogen bonds are weaker than covalent bonds, but are stronger than dipole interactions

A

TRUE

25
Q
A
26
Q

It is the measure of proton concentration.

A

pH

27
Q

Corresponding measure of Hydroxide ion concentration

A

pOH

28
Q

TRUE OR FALSE

Strong acids, such as NaOH completely dissociate in water.

A

FALSE. NaOH is not an acid, but a base. However, strong acids, like HCl completely dissociate in water.

29
Q

TRUE OR FALSE

Strong bases, such as NaOH completely dissolve in water.

A

TRUE

30
Q

TRUE OR FALSE

Acetic acid only partly dissociate in water.

A

TRUE

31
Q

measure of the strength of weak acid

A

pKa

32
Q

TRUE OR FALSE

Weak acids with lower pKa values are weaker than those with higher pKa values.

A

FALSE

Lower pKa values are stronger than those with higher pKa values.
In simple terms, the relationship is inversely proportional.

33
Q

It is the capacity of buffer to resist change

A

BUFFER CAPACITY

34
Q

Maximum available energy

A

Free-energy change or Gibbs Free-Energy

35
Q

Father of Modern Chemistry

A

ANTOINE LAVOISIER

36
Q

Universal Energy currency

A

ATP

37
Q

Randomness or disorder in a system

A

ENTROPY

38
Q

Heat content of reacting system

A

ENTHALPY

39
Q

The heat content of the products is less than that of the reactants

A

Negative Change in enthalphy; EXOTHERMIC

40
Q

The enthalpy in Endothermic reaction

A

Positive Change in enthalpy

41
Q

Expressed the amount of energy capable of doing work during a reaction at constant temperature and pressure

A

FREE ENERGY

42
Q

collection of matter that is undergoing a particular chemical or physical process

A

REACTING SYSTEM

43
Q

Reacting system and surroundings

A

UNIVERSE

44
Q

Both energy and mass can enter and exit in this system

A

OPEN SYSTEM

45
Q

Only energy can enter and exit in this system

A

CLOSED SYSTEM

46
Q

No mass and energy can enter or exit in this system.

A

ISOLATED SYSTEM

47
Q

Study of transductions

A

BIOENERGETICS

48
Q

TRUE OR FALSE

Biological energy transformations obey the laws of thermodynamics.

A

TRUE

49
Q

rich and capable of donating electrons

A

NUCLEOPHILES

50
Q

Electron-deficient that seek electrons

A

ELECTROPHILES

BIOMOLECULES LEC (QUALITATIVE) (2 decks)

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