Biological Molecules Flashcards

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1
Q

Describe the formation of a hydrogen bond

A

Weak electrostatic attraction between the partial negative charge on the oxygen and the partial positive charge on the hydrogen

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2
Q

What’s the biological importance of water being a liquid

A

Provides habitats for living organisms, it’s also a major component of cells necessary for metabolic reactions and transport

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3
Q

What’s the importance of waters density property

A

Allows large aquatic animals to float, also allows water to freeze from the surface down allowing ice to insulate the water without freezing the organisms below

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4
Q

What’s the importances of water having the property of being a polar solvent

A

Metabolic reactions take place in aqueous solutions, substances are also transported in aqueous solutions (blood plasma)

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5
Q

What’s the importance of water having cohesive and adhesive properties

A

Allows formations of continuous columns of water (transport in the xylem assisted to adhesion to lignin). The surface tension allows insects to move across the water surface.

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6
Q

What’s the importance of water having the property of high specific heat capacity

A

Ensures internal temperature changes are minimised to maintain a suitable body temperature for enzymes, also minimises temp changes of large bodies for water so aquatic life can live

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7
Q

What’s the importance of water having the property of high latent heat of vaporisation

A

Evaporation cools the organism (sweating for animals and evaporation from mesophyll during transpiration in plants)

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8
Q

“Water is a polar molecule” true or false

A

True

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9
Q

“Oxygen is a more electronegative atom than hydrogen so electrons aren’t shared equally in the covalent bond” true or false

A

True

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10
Q

“Hydrogen atoms acquires a partial negative charge” true or false

A

False

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11
Q

“Oxygen atoms acquires a partial negative charge” true or false

A

True

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12
Q

“Hydrogen bonds form between the oxygen atom of one water molecule and the hydrogen atom of another water molecule” true or false

A

True

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13
Q

“Hydrogen bonds are strong intermolecular forces” true or false

A

False

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14
Q

“Each water molecule can form up to 3 hydrogen bonds” true or false

A

False

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15
Q

“Hydrogen bonds are individually weak but many hydrogen bonds are collectively strong” true or false

A

True

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16
Q

“Water has a relatively high boiling point so is a liquid at room temperature” true or false

A

True

17
Q

“Ice is more dense than water, so floats and insulates the water beneath” true or false

A

False

18
Q

“Water is a good solvent for non polar molecules and ions” true or false

A

False

19
Q

“Many metabolic reactions take place in aqueous solutions” true or false

A

True

20
Q

“Water is an important transport medium in plants and animals” true or false

A

True

21
Q

“Surface tension is due to the formation of hydrogen bonds between water molecules” true or false

A

True

22
Q

“Cohesion and adhesion are important for the transport of water in the phloem vessels in plants” true or false

A

False

23
Q

“Water has a low specific heat capacity, so temperature changes are minimised” true or false

A

False

24
Q

“High specific heat capacity of water means its easier for mammals to maintain a stable body temperature for enzyme activity” true or false

A

True

25
Q

“Water provides a thermally stable habitat for aquatic organisms” true or false

A

True

26
Q

“Water has a high latent heat of vaporisation, so evaporation of water is used as a cooling mechanism in plants and animals” true or false

A

True

27
Q

“Water is an important reactant in photosynthesis and hydrolysis reactions” true or false

A

True

28
Q

What are inorganic molecules

A

Inorganic molecules are simple molecules that do not contain both carbon and hydrogen

29
Q

What are organic molecules

A

Organic molecules contain both carbon and hydrogen molecules, carbon is the backbone of the molecule

30
Q

Up to page 10

A

Up to page 10