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Biology exam 2 CH. 5
bio
39
Biology
Undergraduate 1
10/04/2017

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Term
cell membrane
Definition
is the outer
boundary of every cell and has similar
structure in all cells.
Term
Prokaryotic
Definition
have no membrane-enclosed internal
compartments.
Term
Eukaryotic
Definition
have
membrane-enclosed organelles in
which different functions occur.
Term
nucleoid
Definition
Dna is located here in prokaryotic
Term
cytoplasm
Definition
the rest of the cell contents
Term
Ribosomes
Definition
sites of protein synthesis
Term
cell wall
Definition
Most prokaryotic cells have a rigid ___ outside the cell membrane
Term
Capsule
Definition
some bacteria have a slimy ____ of polysaccarides
Term
flagella
Definition
some prokaryotes swim using a
Term
Pili
Definition
hairlike projecting from the cell surface
Term
cytoskeleton
Definition
System of protein
filaments that maintain cell shape and
play roles in cell movement and cell
division.
Term
nucleus
Definition
usually the largest organelle
Term
nucleolus
Definition
assembly of ribosomes begin in the region known as
Term
nuclear envelope
Definition
a double membrane
Term
chromatin
Definition
dna combines with proteins to form
Term
endomembrane system
Definition
Interconnected system of membrane enclosed
compartments
Term
endoplasmic reticulum
Definition
Network of membranes in the
cytoplasm; large surface area
Term
Ribosomes are attached
Definition
rough endoplasmic reticulum
Term
no ribosomes
Definition
smooth endoplasmic reticulum
Term
golgi apparatus
Definition
Flattened sacs
(cisternae) and small vesicles.
Term
lysosomes
Definition
Contain digestive
enzymes that hydrolyze
macromolecules into monomers.
Term
Primary lysosomes
Definition
originate from the golgi apparatus
Term
phagocytosis
Definition
food molecules enter the cell by
Term
secondary lysosomes
Definition
phagosomes form with the primary lysosomes to form
Term
exocytosis
Definition
waste are ejected by
Term
mitochondria, process called cellular respiration
Definition
Energy in fuel
molecules is transformed to the bonds
of energy-rich ATP
Term
plastids
Definition
Occur only in plants and
some protists.
Term
chloroplasts
Definition
Site of
photosynthesis; have a double
membrane.
Term
peroxisomes
Definition
Collect and break down
toxic byproducts of metabolism such
as H2O2, using specialized enzymes.
Term
glyoxysomes
Definition
Only in plants—lipids
are converted to carbohydrates for
growth.
Term
vacuoles
Definition
Store waste products and toxic
compounds; some may deter
herbivores (in plant cells)
Term
cytoskeleton
Definition
• Supports and maintains cell shape
• Holds organelles in position
• Moves organelles
• Involved in cytoplasmic streaming
• Interacts with extracellular structures
to hold cell in place
Term
Microfilaments
• Intermediate filaments
• Microtubules
Definition
three components of cytoskeleton
Term
actin
Definition
microfilaments are made from the protein
Term
tubulin A
Definition
microtubules are made from the protein
Term
cilia, flagella
Definition
____ and eukaryotic ____ are made
of microtubules in “9 + 2” array.
Term
plasmodesmata
Definition
Adjacent plant cells are connected by
cell membrane-lined channels called
Term
extracellular matrix
Definition
many animal cells are surrounded by
Term
collagen, proteoglycans
Definition
extracellular matrix is composed of
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