Chapter 2 - Chemical Basis of Life Flashcards

1
Q

Chemistry

A

the branch of science that studies the composition, properties and interactions of matter

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2
Q

Atomic Number

A

the number of protons

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3
Q

Mass Number

A

the total number of protons plus neutrons

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4
Q

Isotopes

A

atoms with the same atomic number but different mass numbers due to differing amounts of neutrons

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5
Q

Radioactive Isotopes

A

unstable isotopes that experience atomic degradation which releases energy
- Releases atomic radiation

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6
Q

Forms of Radiation

A
  • Alpha: consists of particles from atomic nuclei which includes two protons and two neutrons which move slowly and cannot penetrate matter
    • Beta: consists of electrons(smaller) that travel faster and can more deeply penetrate matter
    • Gamma: a form of energy similar to X-radiation and is the most penetrating form of radiation
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7
Q

Octet rule

A

8 electrons are required to fill the shells in most of the atoms important for living organisms, besides if atoms only have 1 shell

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8
Q

Inert

A

used to describe atoms who cannot form chemical bonds due to having outermost shells being stable

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9
Q

Ionic Bond

A

the attraction of two oppositely charged ions which are charged due to the movement of electrons

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10
Q

Covalent Bond

A

the sharing of electrons between two atoms to fill their valence shells and become stable

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11
Q

Nonpolar Covalent Bond

A

covalent bonds where atoms are shared equally due to both atoms having similar electronegativity

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12
Q

Polar Covalent Bond

A

covalent bonds between two atoms where 1 is more electronegative than another, resulting in a pull of electrons towards the more electronegative atom, creating an uneven distribution of charges

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13
Q

Hydrogen bond

A

he weak polar covalent bond between a hydrogen atom and a oxygen or nitrogen atom

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14
Q

Electrolytes

A

compounds that ionize in water due to the positive and negative ends in water molecules causing atoms to dissociate
- E.g. sodium chloride in water will dissociate into sodium and chloride ions
- Electrolyte means they can conduct an electrical current in water

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15
Q

Types of Electrolytes

A
  • Acid: substance which releases hydrogen ions
    • Base: substances that releases ions which combine with hydrogen ions
    • Salt: substances formed by the reaction between an acid and a base
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16
Q

pH Scale

A

measures H+ concentration in grams of ions per litre from 0-14
- It tracks the number of decimal places in 10 fold differences
- pH less than 7 is acidic due to increase in H+
- pH greater than 7 is alkaline due to Decrease in H+

17
Q

Blood pH normal levels and disease levels

A
  • Blood pH is between 7.35 to 7.45
    • Alkalemia: blood pH above 7.5
    • Acidemia: blood pH below 7.3
18
Q

Alkalosis

A

a disease someone encounters when their pH of body fluids exceeds above 7.45 making them feel agitated and dizzy

19
Q

Acidosis

A

a disease when pH of body fluids decreases below 7.35 making them feel disoriented, fatigued and difficulty breathing.

20
Q

Buffer

A

chemical systems which resist pH change by donating H+ when they are depleted or by combining with them when they are in excess

21
Q

Types of Chemicals in Metabolism

A
  • Organic: molecules which contain both carbon and hydrogen molecules
    ○ Non electrolytes as they don’t dissolve in water
    - Carbs, proteins, lipids, nucleic acids
    • Inorganic: substances which don’t contain either carbon or hydrogen atoms
      ○ Usually dissolve in water forming ions(electrolytes)
      - e.g. water, oxygen, C02, nitric acid, Carbon Monoxide, inorganic salts
22
Q

Inorganic substances: water

A
  • Most metabolic reactions occur in water as when water dissociates, it turns into ions which are more likely to react
    • Water is important in transporting chemicals in the body
      ○ Blood made up of mostly water, carries oxygen, sugars, salts and vitamins
    • Water absorbs and carries heat
      ○ Blood brings heat released from muscle cells to the surface
      ○ Skin cells secrete water as sweat which releases heat by evaporation
23
Q

Inorganic substances: Nitric oxide

A

harmful to health yet are important to physiology in small concentrations
- They are biological messenger molecules:
○ NO is involved in digestion, memory, immunity , respiration and circulation
- found in smog, cigarette smoke and acid rain

24
Q

Inorganic substances: oxygen

A
  • Cells use oxygen to release energy from nutrient molecules
  • O2 drives metabolism
25
Q

Inorganic Substances: Carbon Monoxide

A

harmful to health yet are important to physiology in small concentrations
- They are biological messenger molecules:
○ CO functions in the spleen recycling old red blood cells and in the brain which controls memory, smell and other functions
- a colorless, odorless gas that is deadly when it leaks from exhaust pipes, home heating systems

26
Q

Inorganic Substances: Inorganic salts

A
  • The sources of many necessary ions which play a role in metabolism, maintaining water concentration, controlling pH, blood clotting, bone development, energy transfer in cells and muscle and nerve functions
27
Q

Organic Substances: Carbs

A

functions:
- Provide cellular energy
- Materials for cell structure

Subunit:
- Monosaccharides

Examples

28
Q

Organic Substances: Lipids

A

Functions:
- Provide cellular energy
- Provide structure for membranes
- Assist in hormone synthesis

Subunits:
- Triglycerides:
* 1 glycerol head
* 3 fatty acid tails
- Phospholipids:
* 1 glycerol head
* 2 fatty acids
* 1 phosphate
- Steroids:
* 4 carbon rings

Example:
- oil
- butter
- cell membrane
- cholesterol

29
Q

Organic Substances: Protein

A

Function:
- Cell structure
- Transport substances
- Assist in hormone synthesis
- Enzymes
- Movement

Subunits:
- Amino acids:
* Amino group(NH2)
* Central carbon
* R group
* Carboxyl group(CO=OH)

Examples:
- Keratin
- hemoglobin
- Actin/myosin
- Phenalene

30
Q

Organic Substances: Nucleic Acids

A

Function:
- Holding genetic code
- Building proteins

Subunits
- nucleotides:
* Deoxyribose sugar
* Phosphate group
* Nitrogenous base

Example:
- DNA
- RNA

31
Q

Types of reactions:

A
  • Synthesis reaction: building large molecules by bonding smaller ones
    • Decomposition: breakdown of large molecules into smaller ones
      • Exchange reaction: parts of two different types of molecules trade positions as bonds are broken and new ones are formed
32
Q
A