Introduction to Biochemistry Flashcards
Matter
Anything that takes up space and has mass
Element
A substance that cannot be broken down to another substance
Compound
A substance consisting of 2 or more elements
Atom
Smallest unit of an element
Subatomic Particles
- The bits of matter that form an element
- Protons, neutrons and electrons
Valence electrons
- Electrons in the outermost shell
- Participate in chemical bonding
Molecule
2 or more atoms connected by covalent bonds
Covalent bond
The sharing of a pair of valence electrons by 2 atoms
Polar covalent bond
A covalent bond where the electrons are not shared equally
Hydrogen bonds
- Interaction between an electropositive hydrogen and an electronegative atom
- Hydrogen bonds to NOF
Van der Waals Interactions
Weak interactions occurring between temporarily charged atoms or molecules
Chemical Reaction
- The making or breaking of chemical bonds, leading to a change in the composition of matter
- Energy either required or produced
What causes the unique properties of water?
Extensive hydrogen bonding
Cohesive Behaviour
- Hydrogen bonding gives water unusual structure, holding the substance together
- Ex: overfilling a glass of water
Moderates Temperature
Takes lots of energy to change the temperature of water
Expansion upon freezing
- Water is less dense as a solid than a liquid
- Prevents bodies of water from completely freezing
Versatile Solvent
Molecules and atoms are either hydrophilic, hydrophobic or amphipathic
4 Properties of Water
- Cohesive Behaviour
- Moderates Temperature
- Expansion upon freezing
- Versatile Solvent
Organic Molecules
- Molecules containing carbon
Hydrocarbon Molecules
Consists solely of carbon and hydrogen
Isomer
Molecules with the same chemical makeup but different organization
Structural isomer
Differ in covalent arrangement of atoms
Cis-trans isomers
Differ in spatial arrangement around a double bond
Enantiomers
Mirror image molecules due to an asymmetric carbon (chiral centre)
Functional Groups
Groups of atoms that alter the function of a molecule
ATP
- Adenosine Triphosphate
- Energetic organic molecule that provides energy required for many cellular processes
Dipole
Partial postive/negative charges