Ch4 Cell Bio Cell Organelles

67 terms by KatherineGreissman 

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Centrosome

Where microtubles grow and centrioles are found

Nuclear Pore

Passageway for molecules into and out of the nucleus.

Nucleus

Where most of the genetic material is organized and expressed.

Nuclear Envelope

Double membrane that encloses the nucleus.

Lysosome

Site where macromolecules are degraded.

Nucleolus

Site for ribosome subunit assembly.

Chromatin

A complex of protein and DNA.

Ribosome

Site of polypeptide synthesis.

Plasma Membrane

Membrane that controls movement of substances into and out of the cell; site of cell signaling.

Cytosol

Site of many metabolic pathways.

Golgi Apparatus

Site of modification, sorting, and secretion of lipids and proteins.
Packages materials into SECRETORY vesicle.

Peroxisome

Site where hydrogen peroxide and other harmful molecules are broken down.

Cytoskeleton

Protein filaments that provide shape and aid in movement.

Mitochondrion

Site of ATP synthesis.
Involved in the synthesis, modificiation and breakdown of several types of cell brown fat cells. Generate heat known as brown fat cells which serve as "heating pads" that help to revive hibernating animals and protects us.

Smooth ER

Site of detoxification and lipid synthesis.

Rough ER

Site of protein sorting and secretion

Chloroplast

PLANT CELL, Site of photosynthesis

Central Vacuole

PLANT CELL, Site that provides storage; regulation of cell volume.

Cell Wall

PLANT CELL, Structure that provides cell support.

Flagella

PROKARYOTES, Allow certain bacteria to swim.

Pili

PROKARYOTES, Allow bacteria to attach to surfaces and to each other.

Nucleoid Region

PROKARYOTES, Site where the DNA is found

Glycocalyx

PROKARYOTES, Outer glatinous covering. Traps water andhelps protect bacteria form drying out.

Capsule

PROKARYOTES, A thick, gelatinous glycocalyx that helps them avoid being destroyed by the animal's immune system or aid in the attachment to cell surfaces.

Endomembrane System

Includes Nuclear envelope, endoplasmic reticulum, Golgi Apparatus, Lysosomes, vacuoles, plasma membrane and peroxisomes

Axoneme

The internal structure shared by flagella and cilia. Contains microtubules, the motor protein dynein, and linking proteins. Microtubules form an arrangement called a 9+2 array.

Nuclear Matrix

Tow parts: the nuclear lamina (intermediate filaments that line the inner nuclear membrane) and the internal nuclear matrix.

Serves to organize the chromosomes within the nucleus

Cisternae

A network of membranes that form the form flattened, fluid-filled tubules of the Endoplasmic Reticulum.

Lumen

The internal space of an organelle.

Secretory Pathway

Entire route where Proteins destined for secretion are synthesized into the ER, travel to the Golgi, and then are transported by vesicles.

Glyoxysomes

In Plant seeds, Enzymes that are needed to convert fats to sugars.

Semiautonomous Organelles

Mitochondria and chloroplasts. They can grow and divide to reproduce themselves, but they are not completely autonomous because they depend on other parts of the cell for their internal components.

Thylakoid Membrane

A third system of membranes, forms many flattened fluid-filled tubules that enclose a single convoluted compartment within a chloroplast.

Granum

The tubules stacked on top of each other in chloroplasts

Stroma

The compartment of the chloroplast that is enclosed by the inner membrane but outside the thykaloid membrane.

Plastids

Chloroplasts
Chromoplasts: synthesize and store the yellow, orange and red pigments known as carotenoids. Give fall leaves their color.
Leucoplasts: Lack pigment
Amyloplast: A leucoplast that synthesizes and stores starch. Common in roots and tubers.

Cotranslational Sorting

When the synthesis of a protein is halted until the ribosome is bound to the ER membrane. Sorting process begins while translation is occuring.

Cotranslational Sorting of Protein @ER

1. Polypeptide contains an ER signal sequence
2. ER signal sequence recognized by a protein called signal recognition particle (SRP.)
3. SRP pauses translation, binds to a recepton in ER and docks ribosome over a channel protein.
4.SRP leaves and polypeptide threaded through channel to cross ER membrane; ER signal sequence removed by signal peptidase.

Vesicle Formation of Proteins

1. Vesicle formation facilitated by coat proteins.
2.When vesicle buds from membrane, v-snares incorporated into the vesicle membrane.
3. Vesicle released, coat is shed, v-snares in membrane are recognized by t-snares in target membrane.
4. Vesicle fuses with membrane containing the t-snares.

Post-translational protein sorting to nucleus, peroxisome, mitochondria and chloroplasts

1.Chaperone proteins keep protein unfolded.
2. Matrix-targeting sequence binds to receptor.
3. Chaperones are released as protein is transferred to a channel in the outer membrane.
4.Protein is transfered to a channel in the inner membrane.
5.Chaperones bind to protein as it enters the matrix.
6.Matrix-targeting sequence cleaved by enzyme.
7.Protein is completely threaded into the matrix
8. Chaperones are released, and protein folds into its 3-D shape.

4 Interacting parts of a Eukaryotic Cell

the interior of the nucleus
the cytosol
the endomembrane system
the semi-autonomous organelles

Component of a Phospholipid

2 fatty acids w/acyl tail
1 glycerol
1 Phosphate
1 Polar Head Group

N-linked glycosylation

Occurs in Archaea
Carbohydrate attached to the amino acid asparagine in polypeptide chain
1.Group of 14 sugar molecules built onto a lipid called dolichol
2. Carb. tree transferred to asparagine, peptide synthesized into ER lumen through a channel protein.
3. An ER enzyme, oligosaccharide transferase, recognizes sequence and transfers carb tree form dolichol to asparagine

O-linked glycosylation

Occurs in the Golgi apparatus
Involves the addition of a string of sugars to oxygen atom of serine or threonine
Important for production of proteoglycans (highly glycosylated proteins that are secreted from cells and help to organize the extracellular matrix)

High permeability through bilayer

Gases
Very small, uncharged molecules (Ethanol)

Moderate permeability through bilayer

Water
Urea

Low permeability through bilayer

Polar organic molecules (sugars)

Very low permeability through bilayer

Ions
Charged polar molecules and macromolecules

Plasmolysis

When water exits the cell and the plasma membrane pulls away from the cell wall

Osmotic lysis

When a cell takes up so much water it ruptures

Crenation

When water exits the cells causing them to shrink.

Anabolic Reaction

Biosynthetic Reaction

Exonuclease

Degradation of mRNA:
1. Tail removed
2. 5'cap removed
3. Removes nucleotides starting at the 5' end and moving toward the 3' end.

Exosome

Degradation of mRNA:
1. Tail removed
2. RNA degraded in 3' to 5' direction via the exosome.

Break Down Protein in Proteasome

1.String of ubiquitns attached to a target protein.
2.Protein w/ubiquitin directed to the proteasome.
3.Protein is unfolded by enzymes in the cap and injected into the core proteasome. Ubiquitin released back into the cytosol.
4.Protein is degraded to small peptides and amino acids.
5.Small peptides and amino acids are recycled back to the cytosol.

Cytoplasm v.s. Cytosol

Cytoplasm=region enclosed by the plasma membrane, includes they cytosol and organelles
Cytosol=region of cell outside membrane-bound organelles but inside the plasma membrane

Smooth ER Liver Cells

Enzymes in smoother ER of liver detoxify evil molecules, convert hydrophobic toxic molecules into hydrophilic molecules, excreted from body

Smooth ER

Provides surface area for enzymes in metabolic roles (liver cells)
Carbohydrate metabolism
Accumulation of Ca2+ ions
Synthesis of phospholipids and lipids (like cholesterol, which makes testosterone and estrogen)

Rough ER

Sorts proteins
Inserts proteins into the ER
Attaches carbs to proteins and lipids (Glycosylation)

Glycosylation

attaching carbs to proteins and lipids

Golgi Apparatus

Processing
Protein sorting
Secretion
Glycosylationq

Proteolysis

Enzymes called proteases cut proteins into smaller polypeptides
In golgi apparatus

Lysosomes

Found in animal cells, lyse macromolecules
Contain acid hydrolases that break down carbs, proteins, lipids and nucleic acids
Break down stuff from endocytosis

Autophagy

Break down molecules to make new ones

Peroxisomes

Fluid-filled lumen
Breakdown molecules by removing H or adding O
makes hydrogen peroxide H2O2<-- use catalase enzym to break down to H20 and O2

Plasma Membrane

Cell adhesion
Membrane transport
Cell signaling

Cisternae VS Cristae

Cisternae = the folded membranes of the ER
Cristae = the folded membranes of the Mitochondria

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