4. Please provide correct solution. Thank you. Why are lipids and proteins free

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4. Please provide correct solution. Thank you. Why are lipids and proteins free to move laterally in membranes? The interior of the membrane is filled with liquid water. Lipids and proteins repulse each other in the membrane. Hydrophilic portions of the lipids are in the interior of the membrane. There are only weak hydrophobic interactions in the interior of the membrane Molecules such as the microtubules can pull them in various directions Celery stalks that are immersed in fresh water for several hours become stiff and hard. Similar stains left in a 0.15 M salt solution become limp and soft. From this we can deduce that the cells of the celery stalks are hypotonic to both fresh water and the salt solution hypertonic to both fresh water and the salt solution hypertonic to fresh water but hypotonic to the salt solution hypotonic to fresh water but hypertonic to the salt solution isotonic with fresh water but hypotonic to the salt solution The sodium-potassium pump in animal cells requires ATP to pump ions across the plasma membrane. When the proteins of the pump are first synthesized In the rough ER, what side of the ER membrane will the ATP binding (phosphorylation) site be on? It will be on the cytoplasmic side of the ER It will be on the side facing the interior of the ER It could be facing in either direction because proteins are properly reoriented in the Golgi apparatus It could be facing in either direction because proteins arc properly reoriented m the Plasma membrane It doesn't matter, because the pump is not active in the ER Five large dialysis bags, constructed from a semipermeable membrane that is impermeable to sucrose, were partially filled with various concentrations of sucrose and then placed in separate beakers containing an initial concentration of 0.6 M sucrose solution. At 10-minute intervals, the bags were massed (weighed) and the percent change in mass of each bag was graphed. All 5 bags were still limp throughout the time of the experiment (i.e. no turgor pressure or outward force was generated inside the bags). Which line or lines in the graph represent(s) bags that contain a solution that is hypotonic at 50 minutes? Graphs 1 and 2 Only Graph 1 Only Graph 3 Only Graph 5 Graphs 4 and 5 For living organisms, which of the following is an important consequence of the first law of thermodynamics? The energy content of an organism is constant The organism ultimately must obtain all of the necessary energy for life from its environment The entropy of the universe decreases with time as the organism grows in complexity Plants create energy via photosynthesis Life does not obey the first law of thermodynamics

Explanation / Answer

23) biology question

24) answer is D hypotonic to fresh water and hypertonic to salt solution

25) biology question

26) answer is A) graph 1& 2

27) answer is D) plants create energy via photosynthesis

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