Description Examples Passive processes Simple diffusion Kinetic energy Kinetic energy Net movement of particles (ions. molecules. etc.) from an area of their higher concentration to an area of their lower concentration. that is. along their concentration gradient Movement of fats‚ oxygen‚ carbon dioxide through the lipid portion of the membrane‚ and ions through protein channels under certain conditions Osmosis Kinetic energy Simple diffusion of water through a selectively permeable membrane
Premium Cell membrane Diffusion
The Cell membrane surrounds all living cells and is the most important organelle‚ there is also a similar plasma membrane that surrounds all the organelles except for the ribosome. The membrane controls how and what substances can move in and out of the cell/organelle The structure of the membrane is often referred to as the “Fluid Mosaic Model”; this is because of the way it is structured It is composed of phospholipids‚ proteins‚ and carbohydrates‚ which are arranged in a fluid
Premium Cell membrane Cell Protein
the influence of these factors‚ silk‚ jade‚ dye‚ horses‚ and many other goods were traded throughout Asia‚ Africa‚ and Europe. Not only did these factors increase trade‚ but it also helped spread ideas and culture across the world. This cultural diffusion led to new languages and literatures. Through a globalized trading network across Asia‚ Africa‚ and Europe‚ new goods and ideas spread across the world. The Silk Road was started by the Han Dynasty who ruled China from 206 BCE-220 AD.1 China
Premium Silk Road China Byzantine Empire
1. *Attached* 2. An independent variable is a variable whose variation does not depend on that of another. A dependent variable is a variable whose value depends on that of another. 3. Dependent: Graduation rates of the at-risk high-school seniors; Independent: Intensive study program. 4. 5. If an at-risk high-school senior participates in the intensive study program‚ then their graduation rates may increases. 6. A theory is a larger in scope than a hypothesis‚ which is a
Free DNA Cell
forces‚ a substance moves from a region where it is more concentrated to one one where it’s less concentrated Up/against the concentration gradient: movement of a substance to where it is more concentrated. 5. What is diffusion and what are factors that affect diffusion? Diffusion is the net movement of like molecules or ions down a concentration gradient 6. List the participants in metabolic pathways and explain what their function is. Substrates-substance
Free Cellular respiration Adenosine triphosphate Photosynthesis
Diffusion is one of several transport phenomena that occur in nature. A distinguishing feature of diffusion is that it results in mixing or mass transport without requiring bulk motion. Thus‚ diffusion should not be confused with convection or advection‚ which are other transport mechanisms that use bulk motion to move particles from one place to another. In Latin‚ "diffundere" means "to spread out". There are two ways to introduce the notion of diffusion: either a phenomenological approach starting
Premium Diffusion
How is a cell’s membrane structure suited to its functions? Throughout the past century‚ scientists have been able to conduct more research on the structure of a cell membrane and understand its components and functions. The present agreed on model‚ created in 1972 by S. J. Singer and G. Nicolson‚ is called the fluid mosaic model. This model depicts that proteins (integral and peripheral) form a mosaic since they are floating in a fluid layer of phospholipids‚ which makes up the components of
Premium Cell membrane Protein Membrane biology
active transport of a substance out of a cell to maintain equilibrium. 5. By which of the following mechanisms can a cell transport a substance from a lower to a higher concentration? a. Active transport b. Simple diffusion c. Extracellular enzymes d. Facilitated diffusion e. Any of the above 6. Which of the following is not a characteristic of the plasma membrane? a. Contains proteins b. Maintains cell shape c. Selectively permeable d. Composed of a phospholipid bilayer e
Free Bacteria Cell Cell wall
Discuss the structure of the plasma membrane and explain the process of active and passive transport through the membrane. The plasma membrane is made up of proteins that form pores and channels‚ carbohydrate molecules that are used for cell recognition and cholesterol to provide membrane stability. Phospholipid molecules are the most abundant component found in the plasma membrane. Phospholipids molecules are composed of a phosphate head and a lipid tail; the structure of a cell membrane
Premium Cell membrane Lipid bilayer Cholesterol
quality of allowing some‚ but not all‚ materials cross a barrier or membrane. 3. Receptor: Protein that detects a signal molecule and performs an action in response. 4. Diffusion: Movement of dissolved molecules in a fluid or gas from a region of higher concentration to a region of lower concentration. 5. Osmosis: Diffusion of water molecules across a semipermeable membrane from an area of higher water concentration to an area of lower water concentration. 6. Passive Transport: Movement of molecules
Free DNA Protein Cell