Topic 2: Chemical Level of Organization Flashcards
Knowledge of basic chemistry needed for understanding
- Anatomy and Physiology
- Difference between healthy and diseased person
Structure of an atom
Nucleus contains
Protons: positive charge
Neutrons: neutral charge
Structure of an atom
Orbiting the nucleus
Electrons: negative charge
Atoms are electrically Neutral - The number of electrons and protons is equal (neutrons may not be equal to these)
:)
ions
If an atom loses or gains an electron, it is __________
and becomes an ion
It is no longer neutral.
ions
what is it called when an atom gains an electron?
it becomes a negative ion, which is called an anion.
A = -
ions
What is it called when an atom loses an electron?
It becomes a positive ion, which is called a cation.
t = +
Name important ions (electrolytes)
- Calcium (Ca2+)
- Sodium (Na+)
- Potassium (K+)
- Hydrogen (H+)
- Chloride (Cl-)
SPHCC
NaKHCaCl
What are chemical bonds?
- Bond atoms together to form molecules
- Types of bonds:
- Ionic bond
- Covalent bond
- These chemical bonds allow the formation of chemical compounds which may be organic or inorganic
What is an ionic bond?
- Ions formed
- Atom to atom transfer of electrons
- example: NaCl
- Na loses electron = Na+
- Cl gains electron = Cl-
- The positive (Na+) and negative (Cl-) ions attract forming the bond
- In H20 NaCl dissociates (dissolves/separates/ionizes) into ions: Na+, Cl-
- example: NaCl
What is a covalent bond?
Sharing electrons between atoms
example: CH4
Chemical Bonds
What is Organic Substances?
Covalently bonded carbon (C) atoms
Chemical Bonds
Name a few examples of organic substances
Carbs
Proteins
Lipids
Nucleic Acids
Chemical Bonds
What is an inorganic substance?
Usually lack C (carbon) atoms
Chemical Substances
Name a few examples of inorganic substances
Water
NaCl
<span>O</span>2
Chemical Bonds
What inorganic substances contain C atoms?
Carbonic Acid: H2CO3
Bicarbonate: HC03-
Carbon Dioxide: C02
Carbon Monoxide: CO
Water (6)
- Inorganic
- Most abundant substance in cells
- Polar molecules - unequal sharing of electrons leads to a slight charge difference
- Many reactions in the body take place in H2O = Universal solvent
- Transports chemicals (e.g. O2, nutrients)
- Maintains body temperature (37c)
Acids and Bases
- May be organic OR inorganic
- Acids
- Bases
- pH scale
Acids
- Dissociate in H2O releasing H+ ions
- [H+] increases = pH decreases
- e.g. hydrochloric acid (HCl) in H2O → H+ + Cl-
Bases
- Substances that bind free H+ ions in H2O
- [H+] decreases = pH increases
- example 1:
NaOH in H2O → Na+ + OH- (hydroxyl ion) then OH- (base) + H+ → H2O
- example 2:
HCO3- (bicarbonate) + H<strong>+</strong> → H2CO3 (carbonic acid)
- OH- and HCO3- act as bases by binding to the free H+ ions.
pH Scale
- [H+] of free H+ in solution
- Basic → Acidic increases [H+]
- 0acidic——-7neutral——–14basic/alkaline
- e.g. pH of blood = 7.35 - 7.45
Name important organic substances
- Carbohydrates
- Lipids
- Proteins
- Nucleic Acids
- Adenosine Triphosphate (ATP)
What does ATP stand for?
Adenosine Triphosphate
Important Organic Substances
Carbohydrates
- Consists of C, H, and O
- Functions
- source of energy for cells example: C6H12O6 (glucose)
- cellular structures example: DNA + RNA**
- Naming
- Monosacharrides
- Disaccharides
- Polysaccharides
Important Organic Substances: Carbohydrates
Monosaccharides
- Simple sugars
- Basic building blocks of other carbohydrates
- Example: glucose, fructose, ribose, deoxyribose
Important Organic Substances
Lipids
- what is it consisted of?
- examples
- soluble or insoluble?
- polar or non polar?
- list the 3 functions
- list the 4 types
- C, H, O (ratio difference from carbs)
- example: fats, oils, waxes, fatty acids (FA)
- Insoluble (nonpolar) in water
- Functions:
- Protects organs (padding)
- Build cell membranes
- Source of stored energy
- Types
- Glycerides
- Phospholipids
- Cholesterol
- Steroids
Important Organic Substances: Carbohydrates
Disaccharides
- 2 monosaccharides covalently bonded together
- example: glucose + fructose = sucrose
Important Organic Substances
Polysaccharides
- Many monosaccharides (basic building blocks) bonded together
- Example: glycogen (animals), starch (plants)
Important Organic Substances: Lipids
Glycerides
- Most common lipid in body and diet
- Composed of 2 building blocks:
- glycerol (backbone)
- Fatty acids (FAs)
- Naming:
- glycerol + 1 FA = monoglyceride
- glycerol + 2 FAs = diglycerides
- glycerol + 3 FAs = triglyceride
Important organic substances: Lipids-Glyceride
monoglyceride
glycerol + 1 FA
Important organic substances: Lipids-Glyceride
Diglyceride
glycerol + 2 FAs
Important organic substances: Lipids-Glyceride
Triglyceride
glycerol + 3 FAs
Important organic substances: Lipids
Phospholipids
- 3 building blocks
-
phosphate “head” group (polar)
- hydrophillic (water soluble)
- glycerol backbone
-
2 FAs “tails” (non polar)
- hydrophobic (water insoluble)
- example: diglyceride with a phosphate head group
- hydrophobic (water insoluble)
-
phosphate “head” group (polar)
Important Organic Substances: Lipids
Cholesterol
found in cell membranes and used to synthesize steroids
Important Organic Substances: Lipids
Steroids
- derived from cholesterol
- example: bile salts, vitamin D, hormones (testosterone, estrogen, etc)
Important Organic Substances
Proteins
- Consists of C, H, O, N, (also sometimes S)
- example: albumin
- Functions:
- structural materials (example: collagen)
- enzymes, hormones, transporters
- antibodies
- Naming
- Amino acids (aa)
- Dipeptides
- Polypeptides
- Protein
Important Organic Substances: Proteins
Amino Acids
- basic building blocks of all amino acids
- use the name of the aa itself (example: glycine)
Important Organic Substances: Proteins
Dipeptides
2 aa
Important Organic Substances: Proteins
Polypeptides
many amino acids
Important Organic Substances: Proteins
Protein
1 or more polypeptides folded into its final shape
Important Organic Substances
Nucleic Acids
- consists of C, H, O, N, P
- 2 forms
- DNA
- RNA
- building blocks called nucleotides
- each nucleotide contains
- PO4- (phosphate)
- monosaccharide (simple sugar)
- ribose in RNA or deoxyribose in DNA
- organic base:
- A
- T (DNA only)
- U (RNA only)
- C
- G
- Structures in DNA and RNA are different
Important Organic Substance: Nucleic Acids
What is the DNA structure
- PO4 - deoxyribose - A, T, C or G
- Bases bind to form double-stranded helix (twisted ladder)
- A to T
- G to C
- Alternating sugar and phosphate form “uprights”
- Bases “rungs”
- Functions:
- celular reproduction
- used as a template to make RNA
Important Organic Substances: Nucleic Acid
What is the structure of RNA?
- PO4 - Ribose - A, U, C, or G
- single stranded
- A to U
- G to C
- Function
- Protein synthesis
Important Organic Substances
Adenosine Triphosphate (ATP)
- energy stored in covalent bonds - powers cellular activities
- structure = 3 PO4 + ribose + adenine (modified RNA nucleotide)
- In figure 2.23 = high energy bond
- breaking bond creates immediately useable energy
- ATP → ADP (adenosine diphosphate) + Pi (inorganic phosphate)
What does ADP stand for?
adenosine diphosphate
what does Pi stand for?
Inorganic phosphate
Phospholipids
Carbonic Acid
H2CO3
Bicarbonate
HC03-
Carbon Dioxide
C02
Carbon Monoxide
CO