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Q: cell signaling
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A: Q. Describe several specific examples of signaling pathways (celll cell communication)in animals and…
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- Some drugs can prevent the formation of new lysosomes. However, a cell would continue to make hydrolytic enzymes from the DNA still contained in the cell. Where would you most likely find these enzymes after the drug treatment? O Golgi Complex O Smooth Endoplasmic Reticulum O Nucleus O Mitochondrion Strikingly different signaling systems can operate in similar ways. For example, ethylene gas released by ripening fruits diffuses through the air from plant toThe binding of sodium ions (Na+) to a membrane protein is one of the first steps in initiation of the sodium-potassium pump that moves these ions across the membrane. The picture shows the inital set up in this process. How does the protein get the energy needed to continue the process of moving the (Na+) across the cell membrane? Membrane Protein ONa+ Inside the Cell A. O O Nat oc Outside the Cell Con Mitochondria will attach to the protein and provide the energy to push the Na+ through the protein. Energy from ADP is released and a channel in the membrane protein permanently B. opens, resulting in the passage of the Nat. Energy produced from the difference in solute concentration on both sides of the O c. membrane pulls the Na+ through the protein. Con с ATP attaches to the protein and releases a phosphate, making energy available to OD. change the shape of the protein and allowing the passage of the Nat.Adjacent plant cells have narrow channels called plasmodesmata that pass through the cell walls of the connected cells. Which of the following statements best describes a primary function of plasmodesmata? A B с D They eliminate the need for cells to have receptors for signaling molecules. They eliminate the need to produce signaling molecules. They decrease the energy requirements for active transport. They allow the movement of nutrients and signaling molecules across adjacent cells.
- CELL ENVIRONMENTS Fill in the following statement: Diffusion is the movement of molecules from_high_concentration to_low. concentration. is the diffusion of water. BEAKER #I The solution inside the beaker is: % water % salt The solution inside the cell is: 90 10 % water % salt 20% salt How will the water move? Into the cell or out of the cell? 10% salt How will the movement of water affect the cell? The cell O Water molecules This is a(n) solution.Which of the following is NOT correct: The quantity of ER inside a cell fluctuate depending on cell size ER allowing molecules to move from one part of the cell to another The ER function is act as an internal transport system short polypeptides containing less than 20-30 amino acids called .. O oligopeptides O polypeptide O long chain of proteinwww All of the above Target cells are: Cells that send the signal O Cells that receive and respond to the signal O Cells that have no receptors O None of the above What happens to plasma membrane's
- 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.Which of the following provides the most likely explanation for the limiting factor of a cell's size? A B с D As the cell size increases, its volume increases while its surface area does not. As the cell size increases, its volume increases at a faster rate than its surface area. As the cell size increases, its volume increases at a slower rate than its surface area. As the cell size increases, its surface area increases while its volume does not.In vertebrates, which cell-cell junction allows for direct chemical communication between adjacent cell cytoplasms, without contact with the extracellular fluid, and is composed of the transmembrane protein connexin? O Desmosome O Gap junctions O Adherens junctions O Tight junctions O Focal adhesions
- The diagram below shows three different proteins embedded in a cell membrane, as well as the concentration gradient surrounding the cell high concentration channel protein carrier protein lipid bilayer 1 21 3 low concentration Which of the following statements correctly states the process shown in the diagram? O The process labeled 1 shows how cells can easily move molecules with the concentration gradient using high energy molecules. The process labeled 2 shows how cells move molecules against the co entration gradient without needing hic energy molecules The process labeled 3 shows how cells use energy to facilitate the active transport of molecules against the concentration gradient All three processes show how molecules freely move in and out of the cell regardless of the concentration gradient or available en PreviousWhat is the significance of the protein-lined pits? O Protein attracts other proteins needed for ATP synthesis within the cell. Protein-lined pits are able to transport one molecule at a time down the concentration gradient within the cell. The polarity of proteins allows other polar molecules to attach and be transported in the cell by transport channels. Receptors within the pits allow ligands to fuse and be transported into the cell by endocytosis.Which of the following statements on the synthesis of collagen and cell adhesion molecules is FALSE? both are transcribed from genes translation of both occurs in the rough ER both require vesicle transport both require exocytosis O both undergo final assembly in the extracellular space
