Lecture 1-Biological molecules Flashcards

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1
Q

What different structures can carbon form?

A

Simple, Chain, Ring

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2
Q

Carbon can form 4 covalent bonds so it’s ………

A

Tetravalent

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3
Q

Why does carbon have unique stability + diversity?

A

,Because of its Valency + Low atomic weight

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4
Q

Cellular chemical reactions occur ,because of ……

A

A functional group transfer

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5
Q

What do functional groups have that dictate the function of compounds?

A

Specific CHEMICAL properties

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6
Q

Give an example of a CATECHOLAMINE

A

Adrenaline

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7
Q

Give an example of a RETINOIC ACID

A

Ethanoic acid

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8
Q

How are polymers formed?

A

By DEHYDRATION SYNTHESIS-removal of water

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9
Q

What does dehydration synthesis require?

A

ATP

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10
Q

How are polymers broken down?

A

By HYDROLYSIS-addition of water

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11
Q

What happens in hydrolysis?

A

Bonds BETWEEN reactants = broken + the energy released is STORED as ATP

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12
Q

How much of a cell is IONS/SMALL MOLECULES?

A

4%

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13
Q

How much of a cell is PHOSPHOLIPIDS?

A

2%

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14
Q

How much of a cell is DNA?

A

1%

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15
Q

How much of a cell is RNA?

A

6%

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16
Q

How much of a cell is PROTEINS?

A

15%

17
Q

How much of a cell is POLYSACCHARIDES?

A

2%

18
Q

How much of a cell is WATER?

A

70%

19
Q

What is h20?

A

A MEDIUM where cellular reactions occur

20
Q

Name the roles of h20

A
Growth
Nutrition
Hydration
Reproduction
Hygiene
Health
Universal Solvent
Transporter (bodily fluids)
Lubricant (joints + tissues)
Shock Absorber (changes in CSF)
Regulates Body Temperature (sweat)
21
Q

How much water do you need a day?

A

1.5L

22
Q

Are water molecules POLAR?

A

YES

23
Q

All polar molecules + ions are ….. ……. ,because ……

A

Water soluble …….they can form H bonds with h20

24
Q

Why can’t non-polar molecules form H bonds with h20?

A

They have no electrical charge + repel water (HYDROPHOBIC)

25
Q

When complexes are both HYDROPHOBIC & HYDROPHILIC, what is this called?

A

Amphiphilic

26
Q

What is influenced by hydrophobic forces?

A

The 3D shape of molecules

27
Q

Why does the plasma membrane have unique properties?

A

Because of its fluidity & polarity

28
Q

Why is there tension of the surface film of a liquid?

A

To reduce surface area ( via attraction of the particles in the surface layer)

29
Q

Where is there surface tension and why?

A

At liquid-air interfaces, because of the GREATER ATTRACTION of liquid molecules to each other (cohesion) than to those in air

30
Q

What are SURFACTANTS?

A

Amphiphilic substances that REDUCE the surface tension of the liquid it is dissolved in

31
Q

Examples of surfactants…..

A
Detergents
Wetting agents
Emulsifiers
Foaming agents
Dispersants
32
Q

Why can the lung alveoli collapse?

A

Because of surface tension

33
Q

What do the lung alveoli do to prevent surface tension?

A

They secrete surfactants

34
Q

What happens when a baby lacks surfactants?

A

Their lungs collapse - ATELECTASIS - they’re prescribed a surfactant inhaler therapy