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Unit A&B review
Vocabulary
85
Biology
12th Grade
02/24/2012

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Term
Organelles
Definition
Tiny specialized structures perfoeming specific cellular functions
Term
Cell
Definition
The smallest living thing. The foundation unit of life
Term
Cell Theory
Definition
All organisms are made up of basic living units called cells and cells come only from pre-exsisting cells
Term
Eukaryotic Cell
Definition
Have a nucleous, a large structure that contains the workings of the cell because it contains the genes
Term
Plasma Membrane
Definition
A phospholipid bilayer in which protein molecules are embedded
Term
Cytoplasm
Definition
A semifluid medium that contains organelles. The plasma membrane regulates the entrance and exit of molecules into and out of the cytoplasm
Term
Cell Wall
Definition
Structure that surrounds a plant, protistan, fungal, or bacterial cell and maintains the cell's shape and rigidity.
Term
Nucleus
Definition
A prominent stucture in the eukaryotic cell. Nucleus is of primary importance because it stores genetic information that determines the characteristics of the body's cells and their metabolic functioning
Term
Chromatin
Definition
Network of fibrils consisting of DNA and associated proteins observed within a necleus that is not dividing
Term
Chromosomes
Definition
Rodlike structure in the nucleus seen during cell division; contains the hereditary units, or genes.
Term
Nucleoplasm
Definition
Semifluid medium of the nucleus containing chromatin
Term
Nucleolus
Definition
Membrane bounded organelle within a eukaryotic cell that contains chromosomes and contraols the structure and functions of the cell
Term
Nuclear Envelope
Definition
Double membrane that surrounds the nucleus and is continuous with the endoplasmic reticulum (ER)
Term
Nuclear Pores
Definition
Opening in the nuclear envelope which permits the passage of proteins into the nucleus and ribosomal subunits out of the nucleus
Term
Ribosomes
Definition
RNA and protein in two subunits; site of protein synthesis in the cytoplasm
Term
Polyribosomes
Definition
String of ribosomes simultaneously translating regions of the same mRNA strand during protein synthesis
Term
Vesicles
Definition
Small, membrane bounded sac that stores substances within a cell
Term
Endoplasmic Reticulum (ER)
Definition
Membranous system of tubules, vesicles, and sacs in cells, sometimes having attached ribosomes. Rought ER HAS ribosomes, Smooth ER does NOT
Term
Glycoprotein
Definition
Protein in plasma membranes that bears a carbohydrate chain
Term
Golgi Apparatus
Definition
Organelle consisting of flattened saccules and also vesicles, that processes, packages, and distributes molecules about or from the cell
Term
Secretion
Definition
Releasing of substance by exocytosis from a cell that may be a gland or a part of a gland
Term
Lysosomes
Definition
Membrane-bounded vesicles that contains hydrolyic enzymes for digesting macromolecules
Term
Valcuole
Definition
Membrane-bounded sac that hold fluids and a variety of other substances
Term
Peroxisomes
Definition
Enzyme-filled vesicles in which fatty acids and amino acids are metabolized to hydrogen peroxide that is broken down to harmless products
Term
Chloroplasts
Definition
Membranous organelle in which ATP molecules are produced during the process of cellular respiration
Term
Stroma
Definition
Fluid within a chloroplast that contains enzymes involved in the synthesis of carbohydrates during photosynthesis
Term
Thylakoids
Definition
Flattened Sac within a granum whose membrane contains chlorophyll and where the light-dependent reactions of photosynthesis occurs
Term
Granum
Definition
Stack of chlorophyll-containing thylakoids in a chloroplast
Term
Mitochondrion
Definition
Membranebounded organelle is which ATP molecules are produced during the process of celluar respiration
Term
Matrix
Definition
Unstructured semifluid substance that fills the space between the cells in connective tissues or inside organelles
Term
Cristae
Definition
Short, fingerlike projections formed by the folding of the inner membrane of mitochondia
Term
Cytoskeleton
Definition
Internal framework of the cell, consisting of microtubules, actin filaments, and intermediate filaments
Term
Actin
Definition
Muscle protein making up the thin filaments in a sarcomere; its movement shortens the sarcomere, yielding the muscle contraction
Term
Motor molecules
Definition
Protein that moves along either actin filament or microtubules and translocates organelles
Term
Microtubules
Definition
Small cylindrical structure that contains 13 rows of the protein tubulin about an empty central core; present in the cytomplasm, centrioles, cilia and flagella
Term
Centrosome
Definition
Major microtubule organizing center of cells, consisting of granular material. In animal cells, it contains 2 centrioles
Term
Intermediate Filaments
Definition
Ropelike assemblies of fibrous polypeptides that support the nuclear envelope and the plasma membrane
Term
Centriole
Definition
Cell organelle, exsisting in pairs, that occurs in the centrosome and may help organize a mitotic spindle for chromosome movement during animal cell division
Term
Cilium
Definition
Motile, short, hairlike extensions on the exposed surfaces of cells
Term
Flagellum
Definition
Slender, long extensions used for locomotion by some bacteria, protozoans, and sperm
Term
Prokaryotic Cell
Definition
Lacking a membrane-bounded nucleus and organelles; the cell type within the domain bacteria and archaea
Term
Capsule
Definition
Gelatinous layer surrounding the cells of blue-green algae and certain bacteria
Term
Slime Layer
Definition
Gelatinous sheath surrounding the cell wall of certain bacteria
Term
Ribonucleic Acid (RNA)
Definition
Nucleic acid produced from covalent bonding of nucleotide monomers that contain the sugar ribose; occurs in 3 forms: messenger RNA, ribosomal RNA and transfer RNA
Term
Nucleoid
Definition
Region of bacterium where the bacterial chromosome is found; it is not bounded by a nuclear envelope
Term
Plasmid
Definition
Self-duplicating ring of accessory DNA in the cytoplasm of bacteria
Term
Endosymbiotic Hypothesis
Definition
Possible explanation of the evolution of eukaryotic organelles by photocytosis of prokaryotes
Term
Adenosine Triphosphate (ATP)
Definition
Nucleotibe with 3 phosphate groups. The breakdown of ATP into ADP + P makes enery available for enery-requiring processes in cells
Term
Filament
Definition
End to end chain of cells that form as cell division occures in only on plane, in plants, the elongated stalk of a steam
Term
Molecule
Definition
Union of 2 or more atoms of the same element; also the smallest part of a compound that retains the properties of the compound
Term
Compound
Definition
When the atoms are different a compound results
Term
Ions
Definition
Particles (atoms) that carry either a positive or negative charge
Term
Ionic Bond
Definition
The attraction between oppositely charged sodium ions and chloride ions
Term
Covalent Bond
Definition
Atoms share electrons
Term
Double and triple bonds
Definition
Besides a single bond, in which atoms only share a pair of electrons, double they share 2 pairs. triple they share 3 pairs.
Term
Hydrogen Bond
Definition
Occurs whenever a covalently bonded hydrogen is positive and attracted to a negatively charged atom some distance away. H-bonds are representkyt by a dotted like because they are relatively weak and can be broken easily
Term
Hydrophilic
Definition
Ions and molecules that interact with water
Term
Hydrophobic
Definition
Nonionized and nonpolar that do not interact with water
Term
Calorie
Definition
Amount of heat energy required to raise the tempature of water
Term
Acids
Definition
Molecules that dissociate in water, releasing hydrogen ions (H+)
Term
Bases
Definition
Molecules that either take up hydrogen ions (H+) or release hydroxide ions (OH-)
Term
pH2 Scale
Definition
Used to indicate the acidity or basicity (alkalinity) of a solution
Term
Buffer
Definition
A chemical or a combination of chemicals that keep the pH within normal limits
Term
What does gas exchange mean?
Definition
Breathing
Term
Which type of cell is the following describing?
*Evolved 1st
*Cells of a bacteria species
*No membrane-bound organelles
*does not have a nucleus
*Chromosomes are loose in cell
*DOES have ribosomes
Definition
Prokaryotic Cell
Term
Which type of cell is the following describing?
*Mushroom Cell
*Has organelles with membranes
*Has a Nucleus
*chromosomes IN nucleus
*DOES have ribosomes
Definition
Eukaryotic Cell
Term
Which type of cell are animal and plant cells
Definition
Eukaryotic Cell
Term
Name two things that are different between animal and plant cells
Definition
Photosynthesis(plants only) Size of vacuoles, Cell Wall(plants only)
Term
Electron attraction is called?
Definition
Electronegativity
Term
Matter is made up of what?
Definition
Atoms and Molecules
Term
Atoms are made up of 3 particles, what are they?
Definition
Protons, Electrons, and Neutrons
Term
The element that has 2 Protons is?
Definition
Helium
Term
The 6 most biologically important elements?
Definition
Carbon, Nitrogen, Hydrogen, Sulpur, Oxygen and Phosphorus
Term
The # of protons plus the # of neutons=
Definition
The Atomic MASS
Term
O-C-O and H-N-H and H-O-H are all held together by?
Definition
Strong covalent Bond
Term
How strong is an ionic bond?
Definition
Second strongest, first is covalent and third is Hydrogen Bond
Term
Polar
Definition
2 differnt pulls
Term
H+
Definition
Acid
Term
OH-
Definition
Base
Term
Dissociates
Definition
process in which ionic compounds (complexes, or salts) separate or split into smaller particles, ions
Term
The cell theory state?
Definition
The cell is the basic unit of life.
Term
The small size of a cell is best correlated with?
Definition
An adequate surface area for exchanging materials
Term
Vesicles carrying proteins for secretion more between smooth ER and the
Definition
Golgi Apparatus
Term
Lysosomes funtion in
Definition
Intracecellular digestion
Term
Mitochondia
Definition
Are involved in cellular respiration
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