Biological Molecules

Question 1

Describe the formation of a hydrogen bond

Answer 1

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

Question 2

What’s the biological importance of water being a liquid

Answer 2

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

Question 3

What’s the importance of waters density property

Answer 3

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

Question 4

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

Answer 4

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

Question 5

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

Answer 5

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.

Question 6

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

Answer 6

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

Question 7

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

Answer 7

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

Question 8

“Water is a polar molecule” true or false

Answer 8

True

Question 9

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

Answer 9

True

Question 10

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

Answer 10

False

Question 11

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

Answer 11

True

Question 12

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

Answer 12

True

Question 13

“Hydrogen bonds are strong intermolecular forces” true or false

Answer 13

False

Question 14

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

Answer 14

False

Question 15

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

Answer 15

True

Question 16

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

Answer 16

True

Question 17

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

Answer 17

False

Question 18

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

Answer 18

False

Question 19

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

Answer 19

True

Question 20

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

Answer 20

True

Question 21

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

Answer 21

True

Question 22

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

Answer 22

False

Question 23

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

Answer 23

False

Question 24

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

Answer 24

True

Question 25

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

Answer 25

True

Question 26

“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

Answer 26

True

Question 27

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

Answer 27

True

Question 28

What are inorganic molecules

Answer 28

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

Question 29

What are organic molecules

Answer 29

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

Question 30

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Answer 30

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