Cell Processes Cell Transport Photosynthesis Cellular Respiration Cell Cycle
Dec 28, 2015
Cell ProcessesCell Transport
PhotosynthesisCellular Respiration
Cell Cycle
Exchange with the Environment
• Diffusion- the movement of particles from an area of high concentration to an area of low concentration
• Osmosis- the diffusion of water across a cell membrane
No energy required
Cell in Action• Passive transport- the diffusion of particles
through proteins in the cell membrane from areas of high concentration to areas of low concentration- no energy
• Active transport- the movement of particles through proteins in the cell membrane against the direction of diffusion
• ---requires cells to use energy(active transport)
Cell in Action• Endocytosis -the process in which a cell
membrane surrounds a particle and encloses it in a vesicle to bring it into the cell• Exocytosis- the process used to remove
large particles from a cell • a vesicle containing the particles fuses
with the cell
Cell Energy• Photosynthesis- the process by
which plants capture light energy from the sun and convert it into sugar• Cellular respiration- the process of
producing ATP from oxygen and glucose; releases carbon dioxide as a waste product
Photosynthesis
Photosynthesis
• http://earthguide.ucsd.edu/earthguide/diagrams/photosynthesis/photosynthesis.html
• http://earthguide.ucsd.edu/earthguide/diagrams/photosynthesis/photosynthesis_game.html
Photosynthesis can be represented using a chemical equation.The overall balanced equation is...
6CO2 + 6H2O ---------> C6H12O6 + 6O2Sunlight energy
Where: CO2 = carbon dioxide
H2O = waterLight energy is required
C6H12O6 = glucoseO2 = oxygen
Learn these formulas
Photosynthesis: transforms light energy to chemical energy stored in the bonds of sugar-occurs in chloroplast
o Uses carbon dioxide and water
o Produces oxygen and glucose
o Opposite of cellular respiration occurs in mitochondria
Cellular Respiration
Cellular Respiration Equation
ATP ATP ATP
• The molecule that supplies energy to fuel the activities of the cell
• Formed during cellular respiration in the mitochondria
• Adenosine triphosphate
Glucose• a carbohydrate- form of
sugar• Product of
photosynthesis• C6H12O6
• The energy in glucose is- used by plant’s cells
• Some may be stored in the form of other carbohydrates or lipids
cellular
Fermentation• Fermentation is "the process of energy
production in a cell under anaerobic conditions."
• • Anaerobic is when a biological reaction or
process can take place with the absence of oxygen.
2 types of fermentation• 1- Your muscles need energy faster than your
body can provide oxygen to your cells to produce ATP by cellular respiration---
• Fermentation produces lactic acid--- muscle fatigue
• 2- fermentation that occurs in some bacteria and fungi
• Ex. Yeast can make carbon dioxide and alcohol during fermentation of sugar.
Cell Cycle• The life cycle of the cell
• In eukaryotes (cells with a nucleus) it consists of 3 parts• 1-Interphase: cell growth and
chromosome duplication • 2- Mitosis (PMAT)• 3- Cytokinesis
Chromosome• Coiled structure of DNA and protein that
forms in the cell nucleus during cell division• Humans have 46 chromosomes
Binary Fission• The simple cell division in which one cell splits
into two• Used by bacteria
Homologous Chromosomes• Chromosomes with matching or similar
information• Humans have 23 pairs of homologous
chromosomes• Potatoes have 24 pairs of homologous
chromosomes• An organism’s number of chromosomes has
nothing to do with its complexity
Chromatids• Identical copies of
a chromosome• After each
chromosome is duplicated(copied)- the 2 copies are called CHROMATIDS
Centromere• The region that
holds chromatids together when a chromosome is duplicated(copied)
Mitosis• Nuclear division in eukaryotic cells in which
each cell receives a copy of the original chromosomes
• Mitosis makes sure each new cell receives a copy of each chromosome
• Consists of 4 phases- PMAT• Prophase, Metaphase,Anaphase and
Telophase• Second stage of cell cycle
Cytokinesis• The process in which cytoplasm divides after
mitosis• Animal cells-The cell membrane pinches in to
form a groove—eventually pinching ALL the way through the cell
• 2 daughter cells formed• ***Plant cells: Have a cell wall- these cells
must first form a cell plate –in the middle of the cell-this becomes the cell membrane- then new cell wall formed
Cytokinesis