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Biomolecule classes
Part 3
108
Biochemistry
Undergraduate 1
01/24/2012

Additional Biochemistry Flashcards

 


 

Cards

Term
Polymers
Definition
Smaller molecular chains which make up macromolecules
Term
Monomers
Definition
"Building block" molecules of a polymer
Term
Dehydration reaction
Definition
How cell monomers link together to form polymers, a reaction that removes a molecule of water allowing polymers to form a new bond with the monomer.
Term
Hydrolisis
Definition
The process of digesting food (which contains polymers) to make the monomers small enough to be available to cells, in doing this a water molecule breaks the monomer's bond; reverse of the dehydration reaction. Results in simpler molecules
Term
Enzymes
Definition
Specialized macromolecules which speed up chemical reactions in cells
Term
Carbohydrate
Definition
Ranges from sugar molecules in soda to large polysaccharides such as bread. Functions as energy storage, fuel molecules, and structural support.
Term
Monosaccharides
Definition
carbohydrate monomers (single-united sugars) major nutrient in cell, skeletons also raw material for building other organic molecules. CH2O, contains hydroxyl and carbonyl
Term
Disaccharide
Definition
Formed by a dehydration reaction linking two monosaccharides by a glycosidic bond.
Term
Starch and Glycogen
Definition
storage polysaccharides in plants; starch is made of glucose monomers. cellulose works as a "bank" which plant cells withdraw glucose for energy or building materials. Chitin is in insect skeletons and cell walls
Term
Glycosidic bonds
Definition
Covalently bond monosaccharides together
Term
Polysacharides
Definition
carbohydrate polymers formed by monosaccharides bonded by glycosidic bonds.
Term
Lipids
Definition
Diverse hydrophobic compounds composed mostly by carbon and hydrogen, insoluble. Different structure than other groups; no polymers and monomers, mostly energy storage
Term
Organic Compounds
Definition
Carbon based molecules
Term
Isomers
Definition
Same formula different structural arrangements
Term
Hydrophobic
Definition
Molecules don't like water, e.g. all non polar compounds, insoluble at room temperature
Term
Acylic
Definition
Having an open-chain molecular structure rather than a ring-shaped structure.
Term
Saturated
Definition
No double bonds
Term
Unsaturated
Definition
Have double bonds
Term
Cis
Definition
Two compounds on the same sidea
Term
Trans
Definition
Two compounds on opposite sides
Term
Hydroxyl Group
Definition
Hydrogen bonded to oxygen
Term
Chemical Groups
Definition
First 5 are called hydrophilic (waterloving) functional groups, they all are all polar and effect the function of the formula
Term
Carbonyl Group
Definition
Carbon linked by a double bond to an oxygen
Term
Aldehydes
Definition
If carbonyl group is at the end of the skeleton than it is an aldehyde
Term
Ketone
Definition
when carbonyl group is within the skeleton
Term
Carboxyl Group
Definition
Consists of a carbon double-bonded to an oxygen atom and also single bonded to a hydroxyl group. Acidic b/c it so polar, as well as ionized by donating a proton. COOH
Term
Amino group
Definition
nitrogen bonded to 2 hydrogen, weak base
Term
Phosphate group
Definition
A phosphorus atom bonded to four oxygen atoms, usuallyionized and attached to the skeleton by one of its oxygen atoms. Often involved in energy transfers and storage.
Term
Methyl group
Definition
CH3: consists of a carbon bonded to 3 hydrogens, only NONPOLAR group
Term
Trace elements
Definition
Required as a cofactor for enzymes, aka it is required for humans to have very tiny amounts of this in their system
Term
Hydrocarbons
Definition
organic compound with ONLY carbon and hydrogen
Term
Electron Cloud
Definition
Outer most shell of the atom
Term
Most stable atoms
Definition
Noble gases because they have full valence electrons
Term
Isotopes
Definition
Atoms of the same element with the same number of protons but a different number of neutrons therefore having different atomic masses
Term
Valence Electrons
Definition
Electrons in the outer most shell, they want to form an ocelot (8 electrons) therefore try and bond.
Term
Atomic mass
Definition
weight of protons + neutrons in the nucleus
Term
Atomic Number
Definition
How it is arranged on the periodic table, the number of protons and electrons in an uncharged atom
Term
Neutron
Definition
Mass number minus atomic number
Term
Covalent bonds
Definition
Formed when outer electrons are shared between atoms, much stronger than ionic bonds
Term
Stable Molecule
Definition
Formed by covalent bonding, no charge, and no unpaired or "free" electrons
Term
Ionic Bond
Definition
the atoms are bound together by the attraction between oppositely-charged ions. For example, sodium and chloride form an ionic bond, to make table salt (NaCl)
Term
Ion
Definition
Electrically charged atom's (ions) that have gained or lost electrons
Term
Anion
Definition
an ion with more electrons than protons, giving it a net negative charge (since electrons are negatively charged and protons are positively charged).
Term
Positive ion
Definition
has more protons than electrons
Term
Non Polar Covalent Bond
Definition
Shared electrons between atoms, each side has an equal pull, therefore equal electronegativity
Term
Polar Covalent Bond
Definition
Differing electronegativities, thus don't equally share electrons. Results in partial positive charge on around the less electronegative and partial negative on the more electronegative atom. eg. water
Term
More electronegative
Definition
Atoms in the top right of the periodic table, these all have full valence electrons
Term
Cation
Definition
an ion with more protons than electrons, giving it a positive charge b/c protons are positive
Term
Types of lipids
Definition
fats, phospholipids, and steroids
Term
Triglyceride
Definition
Fat. Linking 3 fatty acids to glycerol produces a fat. Main function is long-term energy storage, a gram of fat stores twice as much as a gram of polysaccharide. For immobile plants the bulk is not a problem. Also insulated the body
Term
Unsaturated fatty acids
Definition
One fewer hydrogen atom on each carbon of the double bond, have kinks to prevent fat from solidifying.
Term
Saturated fatty acids
Definition
Fatty acids with no double bonds in their chain b/c they have the maximum number of hydrogen atoms ("saturated with hydrogen")
Term
Transfats
Definition
Created by hydrogenation (adding hydrogen to unsaturated fats and turning them to saturated) a process which makes foods solid
Term
Anabolic steroids
Definition
A type of lipid that structurally resemble testosterone.
Term
Proteins=polypeptides
Definition
Protein is made from amino acid monomers linked by peptide bond
Term
Amino acids
Definition
Monomers of polypeptides. Have an amino and carboxyl group (this group makes it an acid), covalently bonded to a central carbon atom. HNH Can't be made but must be acquired through a diet
Term
Peptide Bond
Definition
is a covalent bond that is formed between two molecules when the carboxyl group of one molecule reacts with the amino group of the another molecule. protein bond
Term
Dipeptide
Definition
a molecule of two amino acids joined by one peptide bond. (shorter version of a polypeptide)
Term
Polypeptides
Definition
Polymers of various amino acids
Term
20 common amino acids
Definition
(20 monomers) each differs in the structure of the side chain
Term
Structural proteins
Definition
chitin and cellulose
Term
Contractile proteins
Definition
Muscular proteins involved in muscle contractions, movement of cells by cilia and flagella, and the movement of cells during cell division (mitosis)
Term
Defensive proteins
Definition
antibodies in the immune system
Term
signal proteins (communication)
Definition
various types of peptide hormones and growth factors that cause cell activity such as growth, cell division, and changes in gene expression
Term
Denaturation
Definition
process where protein structure is altered, polypeptides chains unravel losing their shape and function. For ex. frying an egg
Term
Primary structure of a protein
Definition
unique sequence of amino acids, in order for it to carry out its function these must be in the correct order. Connected by peptide bonds
Term
Tertiary structure
Definition
3D shape, stabilized by hydrophobic groups (between NH and carbonyl groups), and disulphide bridges, folding results from interactions among amino acids
Term
gene (aka nucleotides)
Definition
programs amino sequence of a polypeptide
Term
DNA (1 type of nucleic acid)
Definition
STORAGE of genetic info, double helix
Term
RNA (2nd type of nucleic acid)
Definition
MESSENGER: genes encode RNA molecules through transcription, the linear sequence of genes is then decoded and used to construct the specific sequence of amino acids in proteins. Single polynucleotide chain
Term
Steroids
Definition
Type of lipid, this includes cholesterol and some hormones. Anabolic steroids pose serious health risks
Term
Quaternary structure
Definition
proteins made up of more than one polypeptide
Term
Nucleic acid
Definition
Polymers of genes, genes are composed of a sugar, phosphate group, and nitrogenous base.
Term
ATP
Definition
multifunctional nucleotide used as a coenzyme, transports chemical energy
Term
sulfhydryl group.
Definition
SH used in the formation of a disulphide bond
Term
precursor
Definition
compound that participates in the chemical reaction that produces another compound
Term
homopolymers
Definition
a single type of repeat units
Term
Heteropolymer
Definition
subunits are not all the same, ie. protein with various types of aminoa acids
Term
alpha
Definition
right handed coil
Term
Disulphide bridges
Definition
stabilize the primary and secondary structure of the protein
Term
pyrimidine bases found in nucleic acids
Definition
cytosine, thymine, and uracil
Term
Two factors responsible for electronegativity
Definition
number of protons in nucleus, amount of shielding between electrons and nucleus
Term
secondary structure of a protein
Definition
responsible for alpha helix and beta pleated sheets, coiling and folding produced by hydrogen bonds b/w carbonyl and NH (amino acid group)
Term
Hydrogenated
Definition
Hydrogen added to unsaturated fats. Creates transfats by transforming them to saturated and getting rid of double bonds
Term
Phospholipids
Definition
Similar to fat, found in cell membrane
Term
Plaque
Definition
lipid containing deposit in a blood vessel
Term
Saturated
Definition
Animal fats
Term
Ribose
Definition
Sugar in RNA
Term
Nitrogenous base of RNA
Definition
A, U, C, G
Term
Gene
Definition
Programs the amino sequence of the polypeptide
Term
Nucleotide
Definition
consists of sugar, phosphate, and nitrogenous base (purine or pyrimidine)
Term
Phosphate group
Definition
Sugar of one nucleotide bonds to the phosphate group of the next
Term
Lactose in tolerant
Definition
Mutation in genes or DNA
Term
Disaccharides
Definition
double sugars, ie. maltose and sucrose which combine to form glucose/fructose (isomers)
Term
Monosaccharides
Definition
Simple sugar monomers (fructose, glucose) used for energy/fuel, CH2O
Term
Fats
Definition
store energy, are made of glycerol and fatty acids
Term
Cholesterol
Definition
steroid found in cell membranes, 4 rings
Term
anabolic steroids
Definition
4 ring structure, variant of testosterone, cholesterol, modified sex hormone
Term
Dissacharide
Definition
Two monomers linked together
Three common disaccharides:
sucrose — common table sugar = glucose + fructose
lactose — major sugar in milk = glucose + galactose
maltose — product of starch digestion = glucose + glucose
Term
Cellulose
Definition
Structure polysaccharide, composes most of dietary fiber
Term
Glycogen
Definition
energy storage polysaccharide in animals
Term
Starch
Definition
energy storage polysaccharide in plants
Term

Unsaturated fats

Definition
Plant fats, double bonds, don't have full amount of hydrogen attached. e.g. many oils
Term
diglyceride
Definition
combination of two fatty acids and molecule of glycerol, fat molecule
Term
pentose
Definition
monosaccharide with 5 carbons, found in RNA and DNA
Term
ATP
Definition
Nucleic acid used for carrying chemical energy
Term
Purine
Definition
type of nitrogenous base which makes up nucleotide, ie. adenine and guanine
Term
Mono, di, and triglycerides
Definition
all fats with one two or three fatty acids and always one glycerol
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