Interactive Question 7.2
Cite some experimental evidence that indicates that membrane proteins drift.
A good form of experimental evidence is Fluorescence Recovery After Photobleaching, aka FRAP. In the FRAP process, membrane proteins are labelled with a green fluorescent protein, and part of the plasma membrane is “bleached” with a laser, causing them to lose their fluorescence. The part that was bleached will eventually become fluorescent again, as molecules drift in by diffusion.
How might the membrane composition of membrane lipids differ for two populations of fish if one lives in cold mountain lakes and the other in warm valley ponds? The membrane composition of membrane lipids would differ because the population of fish living in the …show more content…
An osmotic problem Paramecium faces is that excess water enters the cell because it is hypotonic to its environment. As a result, they need to use contractile vacuoles to get rid of excess water in the cell, enabling it to osmoregulate.
Compare the ideal osmotic environment for animal cells and plant cells
The ideal osmotic environment for animal cells would be if it were isotonic, meaning the cell and the environment have the same concentration of solutes and water, so the cell won’t change. The ideal osmotic environment for plant cells would be if it were hypotonic, meaning the environment has a lower concentration of solutes but a higher concentration of water than the cell, so the cell would gain water from its environment and grow.
Interactive Question 7.7
Why is facilitated diffusion considered a form of passive transport?
The movement of molecules in passive transport travels with the concentration gradient (areas of high concentration to areas of low concentration). It does not need energy in the form of ATP. Facilitated diffusion moves substances across the phospholipid bilayer using transport proteins. Therefore, it does not require energy in the form of ATP, since the molecules in facilitated diffusion travels with the concentration gradient as
Cite some experimental evidence that indicates that membrane proteins drift.
A good form of experimental evidence is Fluorescence Recovery After Photobleaching, aka FRAP. In the FRAP process, membrane proteins are labelled with a green fluorescent protein, and part of the plasma membrane is “bleached” with a laser, causing them to lose their fluorescence. The part that was bleached will eventually become fluorescent again, as molecules drift in by diffusion.
How might the membrane composition of membrane lipids differ for two populations of fish if one lives in cold mountain lakes and the other in warm valley ponds? The membrane composition of membrane lipids would differ because the population of fish living in the …show more content…
An osmotic problem Paramecium faces is that excess water enters the cell because it is hypotonic to its environment. As a result, they need to use contractile vacuoles to get rid of excess water in the cell, enabling it to osmoregulate.
Compare the ideal osmotic environment for animal cells and plant cells
The ideal osmotic environment for animal cells would be if it were isotonic, meaning the cell and the environment have the same concentration of solutes and water, so the cell won’t change. The ideal osmotic environment for plant cells would be if it were hypotonic, meaning the environment has a lower concentration of solutes but a higher concentration of water than the cell, so the cell would gain water from its environment and grow.
Interactive Question 7.7
Why is facilitated diffusion considered a form of passive transport?
The movement of molecules in passive transport travels with the concentration gradient (areas of high concentration to areas of low concentration). It does not need energy in the form of ATP. Facilitated diffusion moves substances across the phospholipid bilayer using transport proteins. Therefore, it does not require energy in the form of ATP, since the molecules in facilitated diffusion travels with the concentration gradient as