Below is the skeletal formula of a molecule typically found in cell membranes. What type of molecule is this and how can you tell? What are the functions of this type of molecule in the plasma membrane of a cell? H HO CH3 H- H CH3 H-C-H
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- In the fluid mosaic model: plasma membrane proteins orient their hydrophilic sides toward the internal bilayer. phospholipids often flip-flop between the inner and outer layers. the mosaic refers to proteins attached to the underlying cytoskeleton. the fluid refers to the phospholipid bilayer. the mosaic refers to the symmetry of the internal membrane proteins and sterols.Below is the skeletal formula of a molecule typically found in cell membranes. What type of molecule is this and how can you tell? What are the functions of this type of molecule in the plasma membrane of a cell? CH3 CH₂) (CH₂) 16 CH3 KoAmmonia (NH3) is a weak base that under acidic conditions becomes protonated to the ammonium ion in the following reaction: NH3 + H+ → NH+4 NH3 freely permeates biological membranes, including those of lysosomes. The lysosome is a subcellular organelle with a pH of about 4.5–5.0; the pH of cytoplasm is about 7.0. What is the effect on the pH of the fluid content of lyso- somes when cells are exposed to ammonia? Note: Ammo- nium (NH4+) does not diffuse freely across membranes.
- What major type of molecule contributes to the formation of the cell membrane and what biochemical properties of this molecule promotes the formation of the membrane? What effect allows this type of molecule to come together to form a bilayer and explain how the effect works? A▾ B I I e 2 2Draw and label a cell lipid bilayer and diagram how the following transport processes take place: passive diffusion of oxygen into the cell, facilitated diffusion of potassium into the cell, active transport of sucrose into the cell. Using different symbols (circles for oxygen, squares for sucrose, and triangles for potassium ions), show the relative concentrations (gradients) of these substances on the inside and outside of the cell. For example, to show that oxygen enters the cell by going “down” its gradient, you would draw more circles on the outside of the cell than inside the cell. Be sure to show and label membrane proteins when appropriate, and show the electric membrane potential using “+”s (pluses) on one side and “-”s (minuses) on the other side of the membrane. Also show the proton pump which uses ATP as a source of energy.According to the fluid mosaic model of cell membranes, which of the following is a true statement about membrane phospholipids? They frequently flip-flop from one side of the membrane to the other. They have hydrophilic tails in the interior of the membrane. They can move laterally along the plane of the membrane. They are free to depart from the membrane and dissolve in the surrounding solution.
- Below are listed molecules with different chemical characteristics. Knowing that all molecules will eventually diffuse across a phospholipid bilayer, select the list that most accurately predicts the relative rates of diffusion of these molecules (fastest to slowest) across a biological membrane. alanine, propanol, sodium, estrogen sodium, propanol, alanine, estrogen estrogen, propanol, sodium, alanine estrogen, propanol, alanine, sodiumThe cytoplasm of a certain cell is composed of a solution that is 98% water, 2% solutes. Consider the solution shown in the beaker in this picture: FOOE OOS Foor solution. [Select] Cytoplasm is 98% water, 2% solutes. The solution in the beaker would be considered when compared to [Select] The plasma membrane is impermeable to solutes. Beaker solution is 98% water, 2% solutes the cell. We would expect that the cell would [Select] if it was placed in the would account for whatever changes might occur to the volume of the cytoplasm of the cell when it is placed in the solution.Describe the following as seen under the compound microscope. Cell membrane Mitochondria Golgi apparatus Endoplasmic reticulum Ribosome Centrosome
- Practitioners of naturopathic medicine often use “essential oils” such as lavender oil. (Note that essential refers to their essence or scent and does not imply that these substances are necessary for health.) One of the components of lavender oil is shown below. Based on its structure, could this molecule diffuse through the cell membrane of a skin cell after the oil was applied to the skin surface?Match the following cell structures with their descriptions. 1. Fibers of the cytoskeleton that attach to chromosomes and move them during mitosis 2. Cell junctions that seal cells so tightly together that materials cannot pass between the cells Cilia Intermediate filaments 3. Cell surface appendages that contain microtubules and beat to move substances across the surface Tight junctions of a cell 4. The network of many types of protein fibers that gives shape to the cell and anchors the organelles Microtubules Desmosomes 5. Cell junctions that link the cytoskeleton of adjacent cells in order to prevent the cells from being pulled apart Microfilaments/actin filaments 6. Fibers of the cytoskeleton that allow cells such as amoebae to crawl aroundIdentify the basic structure of the plasma membrane. Label the diagram: What are the components of the plasma membrane? Outside the cell Inside the cell Polar head - Nonpolar tail
