Photosynthesis Ch. 2.1 Cell processes and energy
How do all living things get energy? • REMEMBER: • Autotroph- “auto” self “ troph” nourish • Heterotroph “hetero” other or different • So autotroph makes their own food (plants) • Heterotroph gets food from other sources
The sun is the greatest energy source • Photosynthesis- “photo” means light • And “synthesis” means putting together • All living things get energy from the sun indirectly or directly ….. How? • Autotrophs? • Heterotrophs?
Photosynthesis: Stage 1 • CHLOROPHYLL - the main pigment found in chloroplast. Acts like a solar cell can have other color (yellows red orange) but usually hidden by green1st stage of photosynthesis -energy from light is captured During stage one INSIDE THE CHLOROPLAST THE WATER H20 is split into hydrogen H and oxygen O. Oxygen is given off as a waste product.
Photosynthesis: Stage 1 • Photosynthesis video
Cellular Respiration 2.2 • Cells obtain ENERGY from SUGAR! • Cells break down glucose and other molecules from food in the presence of Oxygen, releasing energy. • BOTH PLANTS AND ANIMALS UNDERGO CELLULAR RESPIRATION.
Cellular respiration: • Cellular respiration overview • Molecules of glucose are broken down into smaller molecules(happens in the cytoplasm) • Part 2: in the mitochondria the molecules are broken down even more and use oxygen and release energy and CO2
Fermentation: energy releasing process w/o Oxygen • Alcoholic: makes alcohol,CO2, and energy using yeast • Lactic Acid: using energy in the cells and the CO2 builds up and produces acids
Cell Division: producing new and healthy cells • Growth • repair damaged structures • reproduce
Cell Cycle: • Cell grows • Prepares for division • Divides into two cells called daughters • Three Main stages: • Interphase- cell grows, makes a copy of the DNA, and prepares to divide
Mitosis Stage 2 • Nucleus divides • DNA is given to each new nucleus • Divided into four stages: • Prophase, metaphase • Anaphase • telephase • Mitosis • Mitosis with chromatid
Cytokinesis: the cytoplasm divides • The cytoplasm divides and you have two new cells • It begins about the same time as telophase. • Animals- splits in two • Plant- forms a cell plate and the plate forms a cell membrane which in turn forms a cell wall