Transcript Slide 1
by Linda Xie and Jessica Pipitone Biology 6th period picture from background from Basic Organization of Cells text from The prokaryotic cell does not have a nucleus. The eukaryotic cell contains a nucleus. Basic Organization of Cells text from All biological membranes, including plasma membranes and all organelle membranes, contain lipids and proteins. Basic Organization of Cells Elements of cell sorted by function Growth The nucleus The ribosomes The endoplasmic reticulum The Golgi apparatus The vacuoles The centrioles Moving The centriole The cytoskeleton Flagella text and picture from Basic Organization of Cells text from Getting rid of bad things in the cell The membrane Some vacuoles The mitochondrion The chloroplast The cytoplasm Multiplying The nucleus The centriole The membrane Different Types of Cells There are two categories of cells: Eukaryotes & Prokaryotes Prokaryotes Bacteria Prokaryotes are cells, but they don’t have a nucleus. They still have DNA though, its just bunched up in the middle of the cell. Bacteria is a prokaryotic cell. Paramecium Eukaryotes Red Blood Cells Eukaryotes have a nucleus which is the only difference between them and a prokaryote. Plant, animal, and fungi cells are all eukaryotes. Nerve cells Plant and Animal cells The main types of eukaryotes are plant and animal cells. Plant cells are in plants and animal cells are found in all animals (pretty self explanatory). Both have the same function for each living thing: to keep it alive. The only difference is on the inside. Plant cells have plastids, a vacuole, and a cell wall. Animal cells have centrioles and lysosomes that plant cells don’t have. To Plant Animal Cell Cell To Animal Plant Cell Cell Cell Nucleus The cell nucleus is found only in eukaryotic cells. Usually it is round and the largest part of the cell. It stores the DNA which stores genetic information of the cell. The nucleus is made up of three main parts, the nucleolus, the nuclear envelope, and the chromatin. text from Analogy of Cell Nucleus If the cell was your body, then ... the cell nucleus would function as your brain, which sends information out to the rest of your body (ribosomes) in order to create important things (proteins) to keep you alive and healthy. Cell Nucleus The Nuclear Envelope Surrounding the nucleus is a thin membrane punctured with holes called nuclear pores that allow specific communication in and out of the nucleus almost like a security guard. Cell Wall Cell walls maintain the cell’s shape, the direction of growth, and provide structural support. Not all living things have cell walls. Plant cells have a lot of chemicals added into their cell walls such as cellulose and lignin (for plant structure). The cell wall is located outside the plasma membrane. text from Cell Wall Structure - non-living and composed of cellulose - cellulose fibrils created in alternating layers for strength - has pits that make it penetrable text and picture from Mitochondria In the cell mitochondria are the main power generators. They convert oxygen and nutrients into energy for the cell to perform everyday functions. Inside a Mitochondria Mitochondria are shaped like a bean and have two membranes. The inner membrane is where most of the energy is made. How Mitochondria Make Energy “There's a slow fire in the mitochondria that takes the oxygen and nutrients and burns it all up to create energy," Teitelbaum says. The mitochondria's inner walls are coated with energy-making chemical reactors that take the fuel and pull it apart. Resulting in energy (ATP). text from. ATP Vacuoles Vacuoles are like sacks that hold water, salt, protein, and carbohydrates in a cell. They’re in all plant cells and some animal cells have small vacuoles. What Else Vacuoles Do Some small vacuoles are involved in transporting substances in the cell, they’re called vesicles. Flowers are their own colors because the liquid in the vacuole is that color. Also, lemons taste sour because the liquid in the vacuole is sour. Same goes for sweet plants. How vacuoles help keep plant structure When you water a plant the water is taken up by the plant cells vacuoles. When the vacuoles are full it presses against the cell wall and the plant can then stand up straight. That’s why a plant that hasn’t been watered is wilted. text from Endoplasmic Rectum (ER) The endoplasmic rectum is where lipids and other nutrients are made and modified. Its also involved in transporting material through the cell either to parts that need it or to the Golgi apparatus. There are two different sections (smooth and rough) of the endoplasmic reticulum. Rough Endoplasmic Reticulum The only reason this section is called “rough” is that there are Ribosomes covering the whole surface. These Ribosomes put the proteins they’ve made into the endoplasmic reticulum. Inside the protein is chemically modified. Ribosomes on the Endoplasmic Reticulum Smooth Endoplasmic Reticulum Smooth ER Rough ER This section of the endoplasmic reticulum has nothing on the surface so its called “smooth.” Its in charge of packaging protein for transportation through the cell . Its also in charge of combining lipids and releasing calcium. Golgi Apparatus After the proteins leave the endoplasmic reticulum they go to the Golgi apparatus or Golgi complex. Here carbohydrates are connected to the lipids and proteins from the ER then sent off the its final destination. What the Golgi Complex Does Has five to eight, membrane-covered sacs called cisternae that look like a stack of deflated balloons. Inside the Golgi complex modifies proteins and lipids that have been built in the ER and prepares them for shipping outside of the cell or to other locations in the cell. How Protein gets to and from the Golgi Complex There are little vesicles that can attach and detach to the Golgi complex. They go to the ER, attach themselves, take in the proteins and lipids ready to be transported, then go back to the Golgi complex. There it fuses to the Golgi membrane and drops off the “goods” it has. Inside the Golgi complex acts like a factory and tweaks the proteins to fit where they will be sent to. Like a post office putting things in special boxes to fit where its going and what it is. Then another vesicle picks it up and will send it to either another part of the cell or to the outside of the cell for use elsewhere. text from Ribosomes Protein is what all cells are made out of; many amino acids make up one protein. So Ribosomes are very important to cells since they take in the amino acids and put them together to make, the basic building blocks of all cells, proteins. Ribosomes are the smallest part of a cell, but there are the most of them. The Structure of a Ribosome RNA gives the instructions for building proteins and brings the amino acids to the ribosome Ribosomes have no membrane and disassembled into two subunits when not actively making protein. About 40 percent of a ribosome is protein and the other 60 percent is RNA. How Ribosomes Do It REALLY COOL ribosome Movie (It’s a must see) The ribosome reads the tRNA one code at a time, adding protein building blocks one by one. The building blocks are made up of amino acids attached to transfer RNA (tRNA) molecules. For every code in the mRNA, there is another tRNA molecule that fits it exactly. As the ribosome moves along the mRNA, it selects the correct tRNA molecules. Each tRNA brings with it the correct amino acid, which the ribosome then adds to the growing protein, releasing the tRNA at the same time. Cytoplasm Cytoplasm is the gelatin-like fluid inside the cell. It acts as a cushion for all the different parts so that they don’t bump into and break each other. Cytoplasm consists of mainly water, but some salt and other organic molecules. Analogy of Cytoplasm If cytoplasm was a stew then.... all the other parts of the cell (mitochondria, vacuoles, Ribosomes, Golgi apparatus, endoplasmic reticulum, etc.) would be the carrots, broth, meat, beans, and other ingredients in the stew. Lysosomes Lysosomes are produced in the Golgi apparatus. They find and break down foreign invaders (such as bacteria) so they might be able to be used again. Or if they find the invader to be really harmful, then they will destroy it and remove it from the cell. text and pictures from Analogy of Lysosomes Lysosomes are almost like the entire police force keeping the city safe and in order. If they find someone extremely (possibly bacteria), they will put that person in jail (removing it from the cell). Plasma Membrane The plasma membrane controls the movement of substances in and out of a cell. It is a little penetrable so some things cross easier than others. Even with an electron microscope you can't actually see the detailed structure of a plasma membrane because it's too thin. text from Plastids Plastids only are in plant cells and photosynthetic organisms. They are in the cytoplasm and have a double membrane surrounding them. The number of plastids in a cell varies depending on the environmental conditions and how the plant adjusts to them and the type of species the plant is. text from Plastids Plastids store molecules like pigments (which give fruits and vegetables an orange or red color when they are ripe). They also store photosynthetic products taken during the summer and are stored for the winter and spring. They are very important for the storage of starch. Foods with a lot of starch contain many plastids. Potatoes have a lot of plastids. text from Potato plastids Centrioles Centrioles are found in most animal cells and come in pairs. They are made of short microtubules that are arranged like a barrel. The two centrioles are positioned at right angles. During cell division, each centriole moves to the opposite sides of the cell and may function in cell division. They are found at the base of cilia and flagella (both are used for cellular motion) . text from Animal and Plant Cells Animal Cell membrane Nucleus Ribosomes Endoplasmic reticulum Golgi apparatus Lysosomes Vacuoles (small or none) Mitochondria Cytoskeleton Things in bold are things that the cell has that other doesn’t Plant Cell membrane Cell wall Nucleus Ribosomes Endoplasmic reticulum Golgi apparatus Vacuoles Mitochondria Chloroplasts Cytoskeleton Do you want to take a quiz? YES NO You’re going to take a quiz! What are the different categories of cells? A: eukaryote and plant B: eukaryote and prokaryote C: plant and animal D: prokaryote and animal You’re going to take a quiz! What are the different categories of cells? A: eukaryote and plant B: eukaryote and prokaryote C: plant and animal D: prokaryote and animal You’re going to take a quiz! What type of cell doesn’t have a nucleus? A: prokaryote B: animal C: eukaryote D: plant You’re going to take a quiz! What type of cell doesn’t have a nucleus? A: prokaryote B: animal C: eukaryote D: plant You’re going to take a quiz! What is the basic building block of all cells? A: amino acids B: water C: oxygen D: protein You’re going to take a quiz! What is the basic building block of all cells? A: amino acids B: water C: oxygen D: protein You’re going to take a quiz! What does the nuclear envelope do? A: allows communication in and out B: gets rid of unwanted things in the cell C: protects the cell from disease D: stores the important information You’re going to take a quiz! What does the nuclear envelope do? A: allows communication in and out B: gets rid of unwanted things in the cell C: protects the cell from disease D: stores the important information You’re going to take a quiz! How are the golgi apparatus and endoplasmic reticulum related? A: they’re the same thing B: they eat each other C: they don’t like each other D: none of the above You’re going to take a quiz! How are the golgi apparatus and endoplasmic reticulum related? A: they’re the same thing B: they eat each other C: they don’t like each other D: none of the above You’re done with the quiz and our cell project!