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Cytology (Cells)
Lowest level of organization that can perform all activities required for life; Life's fundamental unit of structure and function
51
Biology
10th Grade
09/27/2010

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Term
cell theory
Definition
1. all things are composed of one or more cells
2. cells are the basic unit of structure and function
3. new cells all come from exsisting cells
Term
cells were named by...
Definition
Robert Hooke in 1665
Term
.... made the microscope
Definition
Leewenhoek
Term
.... came up with the idea that plants are made up of cells
Definition
Schleiden
Term
.... came up with the idea that all animals are made up of cells
Definition
Schwann
Term
Virchow came up with the idea that
Definition
new cells could only be produced from exsisting cells
Term
the largest of all cells
Definition
egg yolk
Term
all cells except _____ and _______ are microscopic
Definition
egg yolk and nerve cells
Term
the greater the volume of a cell;
Definition
the more difficult it is to receive oxygen and nutrients
Term
the most primitive cell
Definition
prokaryotic
Term
a cell with no nuclear membrane
Definition
prokaryotic
Term
bacteria is a ______ cell
Definition
prokaryotic
Term
these cells only have one chromosome
Definition
prokaryotic
Term
these cells have a nuclear membrane
Definition
eukaryotic
Term
these cells are membrane bound organelles
Definition
eukaryotic
Term
what are the common features between prokaryotic and eukaryotic cells?
Definition
both are bound by plasma membrane, cytosol, chromosome and ribosomes
Term
animals cells contain these things that plant cells do not
Definition
1. lysomes
2.centrioles
3.flagella
Term
plant cells contain these things that animal cells do not
Definition
1.chloroplasts
2.central vacuole and tonoplasts
3.cell wall
4.plasmodesmata
Term
what part of the cell regulates what enters abd leaves the cell?
Definition
the cellular plasm membrane
Term
is the plasm membrane thick or thin?
Definition
thin (100-200 Angstroms)
Term
true or false: the plasma membrane is bilaminar.
Definition
true.
Term
the DNA is located in the ____ of the cell
Definition
nucleus
Term
chromosomes are made up of
Definition
chromatin
Term
granular material usually spread throughout the nucleus except during cell division
Definition
chromatin
Term
these serve as sites of protein synthesis in the cytoplasm
Definition
ribosomes
Term
these two membranous organelles are membrane bound, fluid containing sacs
Definition
vacuoles and vesicles
Term
what does ER stand for?
Definition
Endoplasmic Reticulum
Term
a system of membranous passageways
Definition
Endoplasmic Reticulum
Term
separates cytoplasm into areas for transportation(membranes make passageways)
Definition
ER
Term
which type of endoplasmic reticulum has ribosomes?
Definition
RER
Term
makes porteins for secretion and phospholipids in membrane
Definition
RER
Term
stack of flattened membranous sacs called cisternae
Definition
Golgi apparatus
Term
single membrane sacs
Definition
lysosomes
Term
_______is wedged between phospholipid molecules in animal cells
Definition
cholesterol
Term
cells change the _____ component of their membranes to compensate for changes in fluidity caused by changes in temperature
Definition
lipid
Term
to work properly with active enzymes, membranes need to be about as fluid as
Definition
salad oil
Term
Singer and Nicholson created this in 1972
Definition
Fluid Mosaic Model
Term
________ membrane proteins are embedded in the phospholipid bilayer
Definition
amphipathic
Term
amphipathic phospholipid bilayer and embedded proteins are
Definition
selectively permeable
Term
is diffusion passive or active transport?
Definition
passive
Term
process by which molecules of a substance move from areas of higher concentration to areas of lower concentration, tendency of molecules of a substance to spread out in the availiable space
Definition
Diffusion
Term
is diffusion more rapid in gas or solids?
Definition
gas
Term
diffusion arises from ________ movements
Definition
random (brownian motion)
Term
occurs when the concentration of the solute is the same throughout a system. movement still continues afterward
Definition
dynamic equilibrium
Term
diffsion of water across a selectively permiable membrane
Definition
osmosis
Term
solution has a higher solute concentration than the cell. water rushes out of the cell and it shrinks
Definition
hypertonic
Term
solution has a lower solute concentration than the cell. water rushes into the cell and it bursts
Definition
hypotonic
Term
equal solute concentrations, same on both sides
Definition
isotonic
Term
internal osmotic pressure in plant cells; gives plant firmness or rigidity. survival depends on balancing water uptake and loss.
Definition
turgor pressure
Term
loss of water in the cells due to osmosis; if plant is put into a hypertonic solution, it loses it's water to it's surroundings, shrivels and shrinks. plasm membrane pulls away from the wall; cell wall gives no advantage here
Definition
plasmolysis
Term
if plant cell is isotonic to it's surroundings no movement of water into cell, so cell becomes flaccid plant may wilt.
Definition
flaccidity
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