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Test 1 Terms
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73
Biology
Undergraduate 1
09/13/2010

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Term
specific heat
Definition
the amount of heat that must be absorbed or lost for 1g of that substance to change it's temp by 1 C
Term
solvent
Definition
the dissolving AGENT in a solution
Term
solute
Definition
the substance that is BEING DISSOLVED
Term
colloid
Definition
A stable suspension of fine particles in a liquid
Term
1 mol
Definition
6.022*10^23
Term
pH derivation
Definition
the negative log of the H+ concentration
Term
Buffers
Definition
substances that minimize changes in concentrations of H+ and OH-
Term
organic chemistry
Definition
studies CARBON based compounds (usually also hydrogen)
Term
isomers
Definition
compounds that have the same number of atoms of each element, but are in a different structure
Term
enantiomers
Definition
Isomers that are mirror images of one another
Term
Hydroxyl
Definition
-OH, also written -HO, creates alcohols
Term
Carbonyl
Definition
C=O
Term
ketone
Definition
carbonyl group within carbon skeleton
Term
aldehydes
Definition
carbonyl group on the end of carbon chain
Term
carboxyl
Definition
O=C-OH, makes carboxylic acids, or organic acids
Term
Amino
Definition
-NH2, creates amines
Term
sulfhydryl
Definition
-SH, creates thiols
Term
phosphate
Definition
P bonded to 4 O's, one bonded to the C chain and two with negative charges, creates Organic phosphates
Term
methyl
Definition
CH3, creates methylated compounds
Term
ATP
Definition
adenosine triphosphate, a complicated organic phosphate involved in cell function
Term
polymer
Definition
a long molecule consisting of similar or identical building blocks connected by covalent bonds
Term
monomers
Definition
the repeating units that serve as the building blocks of polymers
Term
dehydration reaction/ dehydration synthesis
Definition
the connection of monomers into a polymer through loss of a water molecule
Term
enzymes
Definition
specialized macromolecules that speed up chemical reactions in a cell
Term
hydrolysis
Definition
the division of a polymer into a monomer by the addition of a water molecule
Term
the 4 important biological macromolecules
Definition
proteins, lipids, carbohydrates, and nucleic acids
Term
monosaccharides
Definition
some multiple of CH2O, simple-sugars, major nutrients for cellular work
Term
disaccharide
Definition
two monosaccharides joined by a glycosidic linkage
Term
glycosidic linkage
Definition
covalent bond formed between two monosaccharides by a dehydration reaction
Term
polysaccharides
Definition
macromolecules with a few hundred to a few thousand monosaccharides joined by glycosidic linkages, used by animals to store energy over long periods of time
Term
starch
Definition
a polymer of glucose monomers
Term
glycogen
Definition
a polymer of glucose that is stored in 1 day periods by humans, and releases individual glucoses when needed through hydrolysis
Term
cellulose
Definition
a structural polysaccharide used to create plant cell walls
Term
lipids
Definition
biological macromolecules that are highly hydrophobic
Term
fat
Definition
constructed from glycerol and fatty acids, also known as triacylglycerol
Term
fatty acids
Definition
contain a long carbon skeleton with a carboxyl group at one end, leading to a hydrocarbon chain
Term
saturated fatty acid
Definition
as many hydrogen atoms as possible are bonded to the carbon chain
Term
unsaturated fatty acid
Definition
contains one or more double bonds, meaning each C cannot bond to as many H as possible
Term
phospholipids
Definition
contains a phosphate group, makes up cell membranes
Term
steroids
Definition
some hormones and cholesterol that are lipids characterized by carbon skeletons consisting of four fused rings
Term
polypeptides
Definition
polymers of amino acids
Term
protein
Definition
consists of one or more polypeptides coiled into a specific 3 dimensional structure
Term
amino acids
Definition
molecules possessing both a carboxyl and amino group
Term
denaturation
Definition
the process of a protein losing its shape,
Term
chaperonins
Definition
protein molecules that assist in the proper folding of other proteins
Term
nucleotide
Definition
N base, 5 C sugar, and a phosphate group
Term
pyrimidine
Definition
six-membered ring of carbon and nitrogen atoms
Term
purines
Definition
a 6 membered ring connected to a 5 membered ring (A and G)
Term
light microscope
Definition
visible light passes through specimen and then through the glass lense that refracts the light
Term
organelles
Definition
membrane-enclosed compartments within a cell
Term
organelles
Definition
membrane-enclosed compartments within a cell
Term
electron microscope
Definition
focuses a beam of electrons through the specimen or onto its surface
Term
Scanning electron microscope (SEM)
Definition
scans the surface of a sample, exciting electrons on the surface, which are then picked up by electric equipment. Has large depth of field
Term
transmission electron microscope (TEM)
Definition
profiles a thin section of a specimen, used to study internal ultrastructure of cells
Term
cytosol
Definition
The jelly-like substance in the cell in which organelles, etc. are found
Term
nucleoid
Definition
The region in a prokaryotic cell in which the DNA is held
Term
plasma membrane
Definition
at the boundary of every cell, funtions as selective barrier
Term
nuclear lamina
Definition
a netlike array of protein filaments that maintians the shape of the nucleus by mechanically supporting the nuclear envelope
Term
chromosomes
Definition
structures that carry genetic information
Term
chromatin
Definition
a complex of proteins and DNA that makes up chromosomes
Term
nucleolus
Definition
the dark center of the nucleus, synthesize rRNA and synthesizes large and small ribosomal sub-units
Term
ribosomes
Definition
cellular components that carry out protein synthesis
Term
endomembrane system
Definition
Carries out tasks including protein synthesis and transport, metabolism and movement of lipids, and detoxification of poisons
Term
vesicles
Definition
sacs made of membrane
Term
smooth ER
Definition
contains no ribosomes, creates enzymes that function in hormones, detoxification, etc. depending on the cell function
Term
rough ER
Definition
have ribosomes, produces various proteins on these ribosomes
Term
glycoproteins
Definition
proteins that are attached to carbohydrates
Term
transport vesicles
Definition
vesicles in transit from one part of a cell to another
Term
golgi apparatus
Definition
center of manufacturing, warehousing, sorting, and shipping
Term
lysosome
Definition
membranous sac of hyrolytic enzymes that an animal cell uses to digest macromolecules
Term
phagocytosis
Definition
the process of amoebas and other protists engulfing smaller organisms or food particles
Term
contractile vacuoles
Definition
vacuoles that pump excess water out of a cell
Term
central vacuole
Definition
carries out hydrolosis, holds reserves of compounds, does a lot of shit in plant cells
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