Biochemistry Flashcards
the study of chemical reactions and pathways of living cells and organisms
Biochemistry
What are the 4 types of macromolecules relevant to biochem?
- Proteins
- Carbohydrates
- Lipids
- Nucleic Acids
serves as the building blocks for cells and carry out cellular functions for all living organisms
Macromolecules
larger substance made of simpler substances
Polymer
smaller substances that make up larger substances
Monomer
a molecule with a central carbon that binds to a hydrogen atom, two functional groups, and a variable side chain
Amino Acid
What are the 2 functional groups of Amino Acids?
- Amine Group (-NH2)
- Carboxyl Group (-COOH)
dictates the unique chemical properties and functions associated with each of the amino acids
R Group
amino acids that can be synthesized by the body
Essential Amino Acids
Amino acids are obtained in what 2 ways?
- Made by the body
- Diet
What 2 ways can Amino Acids be abbreviated? Give an example.
- Three Letters
- Single Letter
Ex: Glycine = “Gly” or “G”
Tryptophan = “Trp” or “W”
a covalent bond formed between 2 amino acids via a dehydration reaction
Peptide Bond
short links of 2 or more amino acids
Peptide
when many amino acids are bonded together
Polypeptide Chain
formed when several polypeptides are folded together into a specific shape
Protein
the process of amino acids turning into into peptides and proteins through the formation of a peptide bond
Polymerization
the enzyme that catalyzes the formation of peptide bonds
Peptidyl Transferase
an amino acid in a peptide or polypeptide once the water molecule has been removed
Residue
Amino Acid Abbreviations:
Alanine
Ala
Amino Acid Abbreviations:
Glycine
Gly
Amino Acid Abbreviations:
Isoleucine
Ile
Amino Acid Abbreviations:
Leucine
Leu
Amino Acid Abbreviations:
Proline
Pro
Amino Acid Abbreviations:
Valine
Val
Amino Acid Abbreviations:
Phenylalanine
Phe
Amino Acid Abbreviations:
Tryptophan
Trp
Amino Acid Abbreviations:
Tyrosine
Tyr
Amino Acid Abbreviations:
Aspartic Acid
Asp
Amino Acid Abbreviations:
Glutamic Acid
Glu
Amino Acid Abbreviations:
Arginine
Arg
Amino Acid Abbreviations:
Histidine
His
Amino Acid Abbreviations:
Lysine
Lys
Amino Acid Abbreviations:
Serine
Ser
Amino Acid Abbreviations:
Threonine
Thr
Amino Acid Abbreviations:
Cysteine
Cys
Amino Acid Abbreviations:
Methionine
Met
Amino Acid Abbreviations:
Asparagine
Asn
Amino Acid Abbreviations:
Glutamine
Gln
How many different structure levels can proteins have? What are they?
4 total
Primary Structure
Secondary Structure
Tertiary Structure
Quaternary Structure
the unique sequence of amino acid residue in a polypeptide chain
Primary Structure
the local folding of a polypeptide in some regions of the chain due to the hydrogen bonding between the amino acids of that polypeptide chain
Secondary Structure
What are the 2 types of local structures in protein?
- Alpha-Helices
- Beta-Pleated Sheets
occurs when a peptide chain coils into a helix + hydrogen bonds form between coils to stabilize the structure
Alpha-Helices (secondary structure)
occurs when portions of the polypeptide chain turn back on itself + have hydrogen bonding between amino hydrogens and carbonyl oxygens
Beta-Pleated Sheets (secondary structure)
the overall three-dimensional structure of a polypeptide and determines its function
Tertiary Structure
the arrangement of multiple, smaller polypeptide chains to form a larger, functional protein
Quaternary Structure
a protein that breaks down other proteins into smaller peptides and amino acids (during digestion) so they can be incorporated into the body for nutrition
Pepsin
the process of a protein unfolding from its natural structure due to changes in pH, temperature and salt concentration
Denaturation
proteins that speed up a chemical reaction but are not consumed or produced by the reaction
Enzyme
a reactant in a chemical reaction
Substrate
a binding area for a reactant on an enzyme
Active Site
a series of reactions in which carbon dioxide and water are converted to glucose and oxygen
Photosynthesis
What is the formula for photosynthesis?
6CO2 + 6H2O»_space;> C6H12O6 + 6O2
What is the primary energy source for plants and animals?
Carbohydrates
What are 3 types of carbohydrates?
- Monosaccharides
- Disaccharides
- Polysaccharides
the simplest form of carbohydrates and cannot be broken down into simpler sugars
Monosaccharide
What 2 forms are monosaccharides found as in nature?
- Cyclic Form
- Open-Chain Form
What 3 things do most monosaccharides have?
- 5 or 6 carbon atoms
- Alcohol groups on their carbons
- Carbonyl Group (C=O)
What do the alcohol groups on the carbons of monosaccharides allow them to do? Why is this helpful?
The alcohol groups allow the monosaccharide to form hydrogen bonds with water.
This makes the monosaccharide water soluble.
Give some examples of monosaccharides
Glucose, Galactose, and Fructose
Ribose (RNA) and Deoxyribose (DNA)
2 sugars bonded together to form a larger sugar molecule that can be broken down into simpler sugars
Disasccharide
Give 2 examples of disaccharides
- Sucrose
- Lactose
polymer chains of many monosaccharide molecules
Polysaccharides
polymers of biological molecules
Biopolymers
Give 3 examples of polysaccharides
- Glycogen
- Starch
- Cellulose
stores energy in the muscles and livers of humans and other animals
Glycogen
water-soluble, helical structures with alcohol groups readily available for hydrogen bonding
Starch
forms hydrogen bonds between its strands to form sheets, making it insoluble and more rigid
Cellulose
insoluble in water and passes through the digestive tract unchanged; collects unwanted residue as it passes through the digestive tract
Dietary Fiber
All polysaccharide biopolymers are made from what type of monomers?
Glucose Monomers
How are the differing roles and functions of glycogen, cellulose and starch reflected in nature?
It’s reflected in their differing structures
nonpolar, water-insoluble molecules that are found in the cells and tissues of living organisms
Lipids
What are the 2 classifications of Lipids?
- Simple Lipids
- Complex Lipids
simple lipids that have long chains of carbon atoms bonded only to hydrogen with a carboxyl group (-COOH) at the end
Fatty Acids
Simple Lipids contain what 3 things?
- Carbon
- Hydrogen
- Oxygen
Complex Lipids contain what 4 things?
- Carbon
- Hydrogen
- Oxygen
- Additional Elements (Nitrogen, Phosphorus, or Sulfur)
What are the 4 major groups of lipids?
- Triglycerides
- Phospholipids
- Steroids
- Waxes
3 fatty acids chains + glycerol
Triglyceride
a hydrocarbon with 3 alcohol functional groups (3-OH groups)
Triol
fats that contain at least one double bond
Unsaturated Fats
fats without any carbon double bonds
Saturated Fats
Give examples of unsaturated vs saturated fats
Unsaturated - Fish, Avocados, Tree Nuts
Saturated - animal fats
a lipid molecule that is made up of 2 fatty acid tails and a phosphate group head
Phospholipid
The part of the phospholipid that is hydrophilic, polar and contains a phosphate group
Head
The part of the phospholipid that is hydrophobic, nonpolar, and contains 2 fatty acid chains
Tails
simple lipids that are characterized by a base structure of 4 connected hydrocarbon rings
Steroids
Name 3 biologically important steroids
- Sex Hormones
- Cholesterol
- Prednisone
a long-chain fatty acid + a long-chain alcohol
Wax
many carbons with an -OH attached to the end
Long-Chain Alcohol
What are the 2 major classes of Nucleic Acids?
- Ribonucleic Acid (RNA)
- Deoxyribonucleic Acid (DNA)
What are the nitrogenous bases of RNA and which match together?
Cytosine (C) > Guanine (G)
Adenine (A) > Uracil (U)
What are the nitrogenous bases of DNA and which match together?
Cytosine (C) > Guanine (G)
Adenine (A) > Thymine (T)
What is the difference in function between RNA and DNA?
RNA - copies genetic information
DNA - stores genetic information
complex organic substance whose molecules consist of many nucleotides linked in a long chain
Nucleic Acid
the monomer building blocks that make up RNA and DNA
Nucleotide
Nucleotides consist of what 3 things?
- 5-carbon Sugar
- Phosphate Group
- Nitrogenous Bases
What 4 things make up an Amino Acid?
- Central alpha-carbon atom that everything else binds to
- A hydrogen atom
- 2 Functional Groups
- An R group