Order Ca2+, CO2, ethanol, glucose, RNA, and H2Oaccording to their ability to diffuse through a lipid bilayer,beginning with the one that crosses the bilayer most read-ily. Explain your order.

Which of these compounds will cross the cell membrane without the aid of a membrane transport protein, and why? H3 NH NH 2. By what transport process will the above compound be transported? What are the factors which drive movement across the membrane in this process? Does this process require input of energy?

Cholesterol maintains the fluidity and stability of membranes at different temperatures. Cholesterol, therefore, ensures that the lipid bilayer Is always packed firmly Always has sugar molecules Is always moving Is destroyed

Proteins are transported from the cytoplasm into the nucleus as well as mitochondria/chloroplasts. There is also a transport that goes via vesicles. Describe these three different transport systems and explain how the cell knows which protein will end up in the organal.

Can you help me to explain every question with these answer?

In your own words, describe one similarity and one difference between diffusion via channels (like aquaporins) and facilitated diffusion.

Which of the following molecules would you expect to diffuse through the lipid bilayer of a plasma membrane most slowly, if at all? CO2 O2 CH4-a nonpolar compound A charged molecule Water

For the following questions, match the labeled component of the cell membrane (Figure 3) with its description. Write the letter that corresponds the concept being asked. E D- Figure 3. 1. Peripheral protein 2. Cholesterol 3. Fiber of the extracellular matrix 4. Microfilament of the cytoskeleton 5. Glycolipid

The average concentration of salt in seawater is about 3.5 percent and the average concen- tration of salt in the human cellular environment is about 0.9 percent. Drinking seawater can be fatally harmful and is highly discouraged even in the most severe cases of dehydration. Which of the following provides the most likely cause for this fact? A B с D The increase in salt concentration in the extracellular environment will increase the per- meability of the cell membrane. The increase in salt concentration in the extracellular environment will cause the move- ment of water into the cell. The increase in salt concentration in the extracellular environment will cause the move- ment of water out of the cell. The increase in salt concentration in the extracellular environment will decrease the per- meability of the cell membrane.

true or false The plasma membrane is made up of two layers of phospholipids making it a lipid bilayer