prokaryotic and eukaryotic cells (and viruses)
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Prokaryotic and Eukaryotic Cells (and viruses). Cell Biology Standard 1c Students know how prokaryotic cells, eukaryotic cells (including those from plants and animals), and viruses differ in complexity and general structure. Prokaryotic Cells (Bacteria). Bacteria Simplest cells - PowerPoint PPT PresentationTRANSCRIPT
PROKARYOTIC AND EUKARYOTIC CELLS (AND VIRUSES)
Cell Biology Standard 1cStudents know how prokaryotic cells, eukaryotic cells (including those from plants and animals), and viruses differ in complexity and general structure.
PROKARYOTIC CELLS (BACTERIA) Bacteria Simplest cells No membrane-
bound organelles No nucleus
DNA is found in “nucleoid region”
pro = before karyo = nucleus
EUKARYOTIC CELLS Membrane-bound
organelles Many chemical reactions
can take place at the same time
Nucleus (Contains DNA) Eu = true karyo =
nucleus Unicellular or multicellular
organisms 2 Types: Plant & Animal
Cells
VIRUSES Not alive DNA or RNA surrounded by protein
TRUE OR FALSE??? 1. Viruses are living and bacteria are non-
living. 2. Both types of cells as well as viruses have
genetic material. 3. The two types of Eukaryotic cells are plant
cells and animal cells. 4. A prokaryotic cell does not have
membrane bound organelles like mitochondria or endoplasmic reticulum.
Eukaryotic cells are found in bacteria.
Eukaryotic cells are differentiated fromprokaryotic cells because eukaryotic cells
A are much smaller.B have permeable membranes.C have a higher rate of reproduction.D have a nucleus.
ORGANELLES OF EUKARYOTIC CELLS
Cell Biology Standard 1d, 1e
NUCLEUS 1D The “brain” of the cell
Contains DNA that codes for ALL the proteins in your body
Surrounded by the nuclear membrane
Membrane has nuclear pores to let mRNA out
When DNA is uncoiled it’s called chromatin
When DNA is coiled up it’s called chromosomes
TRANSCRIPTION 1D DNA is transcribed
(copied) into messenger RNA (mRNA)
mRNA leaves through nuclear pore into cytoplasm
TRANSLATION 1D
mRNA is translated into a protein by a ribosome
That’s how your genes (DNA) predict your appearance (proteins)!
The central dogma of molecular biology outlines the flow of information as the following:
A. DNA ->mRNA-> protein -> ribosome
B. mRNA ->DNA -> ribosome -> protein
C. DNA -> mRNA -> ribosome -> protein
D. Protein -> ribosome -> mRNA -> DNA
Translation is the process of:
A. DNA replication B. ribosomes reading
mRNA code to build a protein
C. DNA copied into mRNA D. mRNA copied into DNA
ORGANELLES 1E Ribosomes: read the mRNA
and make proteins.
Rough ER : covered in ribosomes where proteins are made.
Golgi apparatus: packages proteins in vesicles which are moved to the membrane.
Smooth ER: modifies and detoxifies lipids. (fats, steroids)
Which cellular organelle is responsible for packaging the proteins that the cell secretes?
A cytoskeleton B cell membrane C lysosome D Golgi apparatus
WHICH CELLULAR ORGANELLE IS RESPONSIBLE FOR MODIFYING AND DETOXIFYING LIPIDS?
A Rough ERB MitochondriaC RibosomesD Smooth ER
THE CELL MEMBRANECell Biology standard 1a
Students know cells are enclosed within semipermeable membranes that regulate their interaction with their surroundings.
Surrounds ALL cells!
Controls what enters/leaves the cell
SEMIPERMEABLE – allows some things through but not others
CELL MEMBRANE
Phospholipid bilayer
Polar heads “love” water (hydrophilic) Nonpolar tails “fear” water (hydrophobic)
STRUCTURE
“Fluid mosaic model” Proteins float around like icebergs in the
ocean
FLUID MOSAIC MODEL
Molecules can enter/leave the cell 3 waysDiffusionCarrier-Facilitated (“helped”) diffusionActive transport
CELL TRANSPORT
No energy required
Molecules move from area of high concentration to low concentration
Diffusion of water is called “osmosis”
1. DIFFUSION
No energy required Molecules “helped” across by proteins from high
to low concentration
2. CARRIER-FACILITATED DIFFUSION
Energy required! ATP – the “battery” of the cell Breaking a bond in ATP releases energy Can “pump” molecules from low to high
concentration building them up in the cell
3. ACTIVE TRANSPORT
The cell membrane of the red blood cell will allow water, oxygen, carbon dioxide,and glucose to pass through. Because other substances are blocked from entering, this membrane is called
A. perforated.B. semi-permeable.C. non-conductive.D. permeable.
TRUE OR FALSE??? 1. In both diffusion and carrier-facilitated
diffusion molecules move from high to low concentration.
2. The cell membrane is called the fluid mosaic model because ribosomes float around like icebergs in an ocean.
3. The type of energy needed for active transport to move molecules against the concentration gradient from low to high is ATP.
The cell membrane is a phospholipid bilayer with polar heads on the inside and non polar tails on the outside.
CELLULAR ENERGETICSPhotosynthesis and RespirationStandards 1f and 1g
PHOTOSYNTHESIS 1F Process where sunlight is converted into
chemical energy stored in carbohydrates (sugar)
Occurs in the Chloroplast
CO2 + H2O + light C6H12O6 + O2Carbon Dioxide + water + light Glucose + Oxygen
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• Has stacks of membranes called thylakoids surrounded by space called the stroma
REACTIONS OF PHOTOSYNTHESIS Light-dependent reactions
Need light Energy from sunlight is stored in chemical bonds of
ATP and NADPH O2 is released from waterH2O + light ATP + NADPH +O2
(full batteries) Light-independent Reactions (Calvin Cycle)
Use ATP and NADPH to make glucose from CO2
CO2 + ATP + NADPH C6H12O6
(sugar)
Which of these best completes this concept map?
A an animal cellB a prokaryotic cellC a virusD a plant cell
Which molecule in plant cells first captures the radiant energy from sunlight?
A glucose B carbon dioxide C chlorophyll D adenosine triphosphate
The first stage of photosynthesis in achloroplast is
A. light-dependent.B. temperature-dependent.C. glucose-driven.D. ATP-driven.
CELLULAR RESPIRATION 1G Series of reactions where carbohydrates are
broken down to produce CO2 and energy (ATP)
Occurs in the Cytoplasm & Mitochondria
C6H12O6 + O2 CO2 + H2O + ATP energy Glucose + Oxygen Carbon Dioxide + Water + ATP energy
Matrix is center of the mitochondriaCristae are folded portions of inner
membrane
3 sets of reactions Glycolysis – glucose split into two pyruvate
(Cytoplasm) = 2 ATP
Krebs Cycle – pyruvate broken into CO2 (matrix of the mitochondria) = 2 ATP
Electron TransportChain – most ATP produced (cristae of the mitochondria) = 32-34
ATP
WHICH STEP OF CELLULAR RESPIRATION PRODUCES THE MOST ATP? A. Glycolysis B. Krebs Cycle C. Electron Transport Chain D. All steps produce the same amount of ATP
In aerobic respiration, the Krebs cycle(citric acid cycle) takes place in
A. chloroplasts.B. nuclei.C. lysosomes.D. mitochondria.
A cell from heart muscle would probablyhave an unusually high proportion of
A. lysosomes.B. mitochondria.C. mRNA.D. Golgi bodies.