A vesicle containing proteins modified with M6P has just pinched off the trans Golgi network. Name a protein that will help make sure the vesicle is able to fuse with the correct target membrane.

What are some examples of human cells that produce proteins for exportation? Which cytoplasmic organelle is expected to be well- developed and abundant in those cells?

The following image is based on real results from an influential experiment in cell biology.  This experiment studied the role of the proteins Ran and importin in nuclear protein transport.  The experiment used flourescently-labeled proteins containing a nuclear localization sequence (the "substrate").  Ran, importin, and GTP were either present or absent, as indicated in the figure.  Cells were exposed to these different conditions and then analyzed by fluorescence microscopy. Circles are the cells' nuclei.  Very light circles are the nuclei without the substrate attached. Study the figure below and then answer the questions that follow. 1. What actions does Ran perform by itself? 2. What actions does importin perform by itself? 3. How do Ran and importin act together in the nuclear import of protein? 4. Why is GTP required?

Hello, i understand the question, but i only need to know which option is right, no need for explanation. thanks in advance.

Why do most molecules require the assistance of proteins to cross the cellular membrane? What factors limit diffusion of molecules across the cellular membrane?

List three mediator proteins that move phospholipid molecules from one side of a membrane to the other. Why arethese proteins required?

Please answer asap

What 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 about the microtubule structure is FALSE? O In a single microtubule, all the protofilaments have the same polarity, with (+) end having exposed a (alpha) subunit and the (-) end with the exposed B (beta) subunit O The a (alpha) subunit is of tubulin is constitutively bound to unhydrolyzed GTP Microtubules are polymers of tubulin heterodimers O Most microtubule structures are nucleated from microtubule organizing centers (MTOCs) but sometimes they may not.

Phagocytosis of a bacterial cell by a macrophage, involves extensive remodeling of the actin microfilaments in the cell cortex to produce extensions of the plasma membrane and formation the phagocytic cup. Based on your knowledge of microfilament assembly/disassembly and related cell membrane deformation, explain the underlying processes that would be involved in formation of the phagocytic cup.