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- The plasma membrane is an effective barrier to molecular movement across it, yet many substances do enter and leave the cell. Explain the mechanisms through which this is accomplished and comment on the energy requirements of these mechanisms.Various types of vesicle coats have been implicated in membrane traffic pathways suchas endocytosis, export from the ER to the Golgi, and transport between Golgicisternae. But so far, no coat has been identified for the secretory vesicles that carrymaterial from the Golgi to the plasma membrane. Do you think such a coat is likely toexist? Justify your answer.Question 7. What is the rate-limiting step in the formation of an actin microfilament?
- Diffusion and Osmosis What is your prediction about the effect of molecular weight on rate of diffusion? What is your prediction about the effect of temperature on rate of diffusion?The key components of desmosomes are cadherins and. actin microfilaments intermediate filaments microtubulesHEL 9. Consider the membrane protems in question 7. What cellular functions must always be performed by an integral membrane protein? Explain. NEL 2.2 Membrane Structure and Functio
- i. Why are carbon, nitrogen, oxygen, and hydrogen the most abundant elements in living matter and, therefore, considered macronutrients? ii. Explain the Fluid Mosaic membrane model of plasma membrane structure. iii. What is the difference between simple diffusion, facilitated diffusion, and active transport? :=4 Paramecium caudatum lives in a hypotonic solution. Excess water is removed from the cell via structures called contractile vacuoles. Given what you know about vacuoles (refer to Table 4.3, p. 79) and what you know about cells able to contract, suggest the type of transport that occurs when water is moved out of Paramecium.4) Two membrane preparations have been made from the plasma membrane of erythrocytes (i.e red blood cells) and are being maintained in an isotonic buffer solution: (1) right-side-out membrane vesicles, in which the exoplasmic leaflet of the vesicle faces the buffer (equivalent in orientation to that of the exoplasmic leaflet of the intact plasma membrane); and (2) inside-out membrane vesicles in which the exoplasmic leaflet faces the interior of the vesicles and the cytoplasmic leaflet faces the buffer. 80 a. Right-side-out vesicles (ROVS) Very Low Fluorescence Inside-out vesicles (IOVS) Very High Fluorescence A newly discovered phosphoglyceride, called phosphotidylalanine is currently being studied. Annexin V is a protein that binds to phosphatidylalanine, which is one of the phospholipids present in the cell membrane preparations described above. Fluorescently labeled Annexin V is mixed with each vesicle preparation. The vesicles are washed to remove unbound Annexin V and then…
- HC CH reaction with HC CH lysosome CH CH HC CH3 HC CH3 HC CH HC. CH CH3 CH3 ОН OH inside the cell, propranolol sometimes encounters lysosomes, which alter its NH group as shown above (right). reacting with the lysosomes, propranolol becomes trapped inside the cell and can cause psoriasis or other inflammatory side effects. Use IMFS to explain why the altered propranolol gets trapped. Tizzing/user/attempt/quiz_start_frame_auto.d21?ou=D3269550&isprv3&drc%3D1&qi=1995726&cfql=0&dnb3D0&fror 12 Time Left:0:04:09 Angelina Tran: Attempt 1 O anabolism Question 50 (2 points) Listen Which of the following is NOT part of the endomembrane system? O chloroplast plasma membrane vesicles endoplasmic reticulum Previous Page Next Page Page 10 of 10 Submit Quiz 45 of 50 questions saved MacBook PrOREEP family proteins act as wedges to promote bending of the membrane true or false