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Biology
Chapter 7
75
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09/13/2005

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Term
cell
Definition
The basic unit of life
Term
nucleus
Definition
large membrane-enclosed structure that contains the cell's genetic material in the form of DNA
Term
Eukaruotes
Definition
cells that contain nuclei
Term
Prokaryotes
Definition
cells that do not contain nucleii
Term
organelles
Definition
"little organs"
Term
Cytoplasm
Definition
portion of the cell outside the nucleus
Term
nuclear envelope
Definition
two membranes surrounding the nucleus
Term
chromatin
Definition
granular material you see in the nucleus which consist of DNA bound to protein
Term
chromosomes
Definition
thread-like structures which contain the genetic information that is passed from one generation of cells to the next
Term
necleolus
Definition
a small, dense region inside the nuclei where the assembly of ribosomes begine
Term
ribosomes
Definition
small particles of RNA and protien found throughout the cytoplasm
Term
endoplasmic reticulum
Definition
the site where lipid components of the cell membrane are assembled, along with protiens and other materials that are exported from the cell
Term
golgi apparatus
Definition
an organelle used to modify, sort, and package proteins and other materials from the endoplasmic reticulum for storage in the cell or secretion outside the cell
Term
lysosomes
Definition
small organelles filled with enzymes that digests lipis, carbohydrates, and protiens into small molecules that can be used by the rest of the cell
Term
vacuole
Definition
saclike structures that store material such as water, salts, protiens and carbohydrates
Term
mitochondria
Definition
organelles that convert the chemical energy stored in food into compounds that are more convienient for the cell to use
Term
chloroplast
Definition
organelles that capture the energy from sunlight and convert it to chemical energy in a process called photosynthesis
Term
centrioles
Definition
organelles not found in plants, but located near the nucleus to help organize cell division
Term
cytoskeleton
Definition
a network of protien filaments that helps the cell to maintain it's shape
Term
cell membrane
Definition
regulates what enters and leaves the cell and also provides protection and support
Term
cell wall
Definition
a strong supporting layer around the membrane
Term
lipid bilayer
Definition
a composition of nearly all cell membranes, a double-layered sheet.
Term
concentration
Definition
of a solution is the mass of solute in a given volume or solution, or mass/volume
Term
diffusion
Definition
when particles tend to move from an area where they are more concentrated to an area where they are less concentrated
Term
equilibrium
Definition
when the concentration of the solute is the same througout
Term
osmosis
Definition
the diffusion of water through a seletively permeable membrane
Term
isotonic
Definition
means "same stregnth"
Term
hypertonic
Definition
above stregnth
Term
hypotonic
Definition
below stregnth
Term
facilitated diffusion
Definition
when the cell membrane protien is said to hlep the diffusion of glucose across the membrane
Term
active transport
Definition
when cells must move materials in the opposite direction against a concentration force
Term
phagocytosis
Definition
extensions of cytoplasm surround a particle and package it within a food vacuole
Term
pinocytosis
Definition
when cells take up liquid from the surrounding environment. Tiny pockets form along the cell membrane, fill with liquid and pinch off to form vacuoles with in the cell
Term
endocytosis
Definition
process of taking material into the cell by means of infoldings, or pockets of the cell membrane
Term
exocytosis
Definition
when the membrane of the vacuole surrounding the material fuses with the cell membrane, forcing the contents out the cell
Term
cell specialization
Definition
cells throughout an organism can develop in different ways to perform different tasks
Term
tissue
Definition
a group of similar cells that perform a particular function
Term
organ
Definition
when many tissue's work together
Term
organ system
Definition
a group of organs that work together to perform a specific function
Term
centrioles
Definition
what parts do animal cells have that plant cells do not have?
Term
Cell wall, chloroplast
Definition
What cell parts do Plant cells have that Animal cells do not have?
Term
it protects the cell membrane
Definition
why do plant cells have cell walls and Animal cells do not?
Term
phtosynthesis
Definition
why do think that plant cells have bigger vacuoles than animal cells
Term
Hans and Zack Janssen
Definition
Who invented the microscope and when?
Term
robert Hooke
Definition
WWho was one of the first to see plant cells in cork?
Term
Matthais Schledian
Definition
Observed and noted that all plants are made of cells
Term
Theodore Shwann
Definition
concluded that animals are made of cells
Term
Rudolf Virchow
Definition
In 1855 concluded that everything must be made of cells, and they came from other cells.
Term
Composed cells
Definition
What are all living things made of?
Term
Structure and Function
Definition
Cells are the basic unit of _____ and _______ of all living things.
Term
existing
Definition
All cells are produced from ________ cells.
Term
cell
Definition
All cells are surrounded by a ______ membrane or PLASMA MEMBRANE, which is a thin, flexible barrier.
Term
cellulose
Definition
What is the cell wall made of?
Term
nucleus
Definition
Most cells have a control center called the _______ which contains genetic material
Term
Cytoplasm
Definition
A jelly-like material within the cell membrane, but not in the nucleus
Term
Prokaryotes
Definition
______________ primitive cells without organelles, no nucleus...etc.
Term
Eukaryotes
Definition
cells that have membrane-bound organelles
Term
Cell wall
Definition
_____ _____ only found in some organisms such as plants, cellulose
Term
support and protection
Definition
the cell wall provides ____ and _____
Term
chromatin
Definition
Long thing strands of invisible DNA
Term
Chromosones
Definition
Visible, short, coiled, thick strands of DNA
Term
Necleolus
Definition
The nucleus also contains dense dark areas called ___________
Term
nuclear envelope
Definition
surrounded by a nuclear membrane or _______ which has many opening or pores
Term
cytoskeleton
Definition
the support structure of cells. Made of protien filaments that help maintain the shape of cells and is involved with movement in some cells like microorganisms
Term
microtubules
Definition
Hollow protien tubes that act as "tracks" for organelles.
Term
centrioles
Definition
only found in animal cells and help with cell division
Term
microfilaments
Definition
long thin fibers that support cells
Term
ribosomes
Definition
tiny dot-like organelles where proteins are assembled
Term
endoplasmic reticulum
Definition
a system of internal membrane pathways that transport substances in a cell
Term
rough
Definition
membranes have ribosomes all over the surface making them look rough
Term
smooth
Definition
membranes have no ribosomes on them
Term
golgi apparatis
Definition
"stacks" of flattened membranes that process proteins made on the rough E.R
Term
lysosomes
Definition
small enzyme-filled organelles that break down substances such as carbs, fats, proteins in cells
Term
mitochondria
Definition
a bean-like organelle which has many folded membranes inside. It is where cellular respeiration occurs. Where foods are broken down for energy for a cell energy to do cell work.
Term
organelle DNA
Definition
Chloroplast and mitochondria have their own DNA that is different from the nucleus.
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