Biological molecules (Water and Proteins) and Transport in plants recap AS Biology [JM]
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Transcript of Biological molecules (Water and Proteins) and Transport in plants recap AS Biology [JM]
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BIOLOGICAL MOLECULES
Water and Proteins
Jorge Melo
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Recap
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How does the water goes up?
Transpiration pull (negative pressure)
Root pressure (positive pressure)
Capillarity (small plants)
2 important factors of the water: Cohesion: H2O molecules
tend to stick together Adhesion: H2O molecules
tend to stick to the inside of the xylem
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xerophytes
Leaves Small to reduce the surface area Thick to reduce surface area
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xerophytes Sunken Stomata
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xerophyte
Thick waxy cuticles
reduce water loss through the epidermis
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What am I?
My relative molecular mass is 18g/mol.
There is 1.26 million trillion tons of me on earth.
I can be found as a solid, liquid, or gas.
I make up 70% of human body.
Two hydrogen and one oxygen.
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Aim: To explore the structures and functions of different macromolecules
Objectives by the end of this lesson SSBAT:
List the properties of water that make it essential to life.
Explain how the atomic structure of water affects its biological interactions.
Describe the properties of proteins and its structures
Aims and objectives
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Biomolecules group task
Carbohydrates Functions
Proteins Importance
Lipids Sources
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Introduction Human body
Many different types of molecules
Such as:
Biomolecules
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Water
The most common is water
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Water
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Water structure 2 H atoms 1 O atom covalent bonds O (δ-) H (δ+) hydrogen bonds
Ice Vapour Liquid
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Water Properties
High specific heat capacity. Temperature Kinetic energy 4.1 KJ/°C
High latent heat.
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Water Properties
High density.
Surface tension and cohesion.
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Water as a solvent Water can carry a wide range of
substances in solution.
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Proteins
Enzymes
Amino acids
Genetic code
Structural/mechanical functions
Meat, dairy products, soya, fish, beans, eggs
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Proteins also form some of the entrances and exits through the cell.
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Proteins
4 elements C H O N
Basic unit: amino acid
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Proteins
Amino group- NH2
R group
Carboxyl group -COOH
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Condensation reaction
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Proteins
Polypeptide chain
Condensation reaction
Loss of 2 H atoms
And loss of 1 O
Ribosome
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Hydrolysis reaction
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Recap
Hydrolysis
Condensation
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Primary structure
Amino acid
Polypeptide chain
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Primary structure
20 different AA
Polypeptide may contain hundreds
A change in one makes it a different protein
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Secondary structure
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Secondary structure
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Secondary structure
Polypeptide chains do not lie in straight
Some parts of the chain may Coil into a regular pattern calledα-Helix
Hydrogen bonds
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Tertiary structure
Disulphide bonds
Ionic bonds
Intermolecular interactions
Hydrophobic bonds
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Quaternary
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Heamoglobin
Globular protein
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Fibrous protein
Colagen
Collagen
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Fibrous Vs Globular
Fibrous proteins Globular proteins
Stable structure Relative unstable structure
Insoluble in water Soluble in water
Strength gives structural structures
Metabolic functions
Polypeptide chains from long strands
Polypeptide chains “roll up” into spherical shape
E.g. Collagen in bone and keratin in hair
E.g. all enzymes , antibodies, some hormones (e.g. insulin), heamoglobin
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Review
1. Which of the following suspects is a protein component?
2. List some foods that provide proteins?
3. How does my body use proteins?
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Task1
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Aim: To explore the structures and functions of different macromolecules
Objectives by the end of this lesson SSBAT:
List the properties of water that make it essential to life.
Explain how the atomic structure of water affects its biological interactions.
Describe the properties of proteins and its structures
Aims and objectives
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