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What is the explanation for the fact that most cells are small and have cell membranes with many convolutions?
Small cells are better able to transport material more efficiently. Many convolutions increase the surface area of the cell, thus allowing for more interactions between the cell and its environment. A large cell has greater volume to its surface area and if this is too large, it will not get enough protein and oxygen.
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What are small channels that form across the plasma membranes of adjacent cells?
Gap junctions are small channels that form across the plasma membranes of adjacent cells, allowing for direct communication and exchange of ions, small molecules, and signaling molecules between the cells.
How does cytokinesis in animal cells differ from cyoknesis in plant cells?
In animal cells cytokinesis occurs when a cleavage furrow(a groove in the cell surface) forms around the cell. This furrow narrows the cell across the centre and eventually pinches it into two new cells.In plant cells a cleavage furrow does not form. Instead a cell plate forms across the equator of the cell. The cell plate consists of small vesicles which fuse to form two membranes across the cell. The new membranes fuse with the existing cell membranes and a new cell wall forms between them.
Plasma membranes that have been isolated from red blood cell are not contaminted by internal cell membane?
Plasma membranes isolated from a red blood cell will not be contaminated with internal cell membrane (i.e. membrane from cell organelles - small structures found within cells) because red blood cells do not contain any organelles, so there will be no 'internal membrane' to contaminate.
In the small intestines folds in the cell membranes of intestinal does cells increase the cells' surface area and allow for greater transport of nutrients.?
In the small intestine, the folds in the cell membranes of intestinal epithelial cells, known as microvilli, significantly increase the surface area available for nutrient absorption. This enhanced surface area facilitates more efficient transport of nutrients, allowing for a greater amount of nutrients to be absorbed into the bloodstream. The intricate structure of these folds ensures that the intestine maximizes its capacity to absorb essential nutrients from digested food.
What digestive enzymes are located in the plasma membranes of cells in the lining of the small intestine?
The plasma membranes of cells in the lining of the small intestine contain brush border enzymes, which are responsible for the final breakdown of carbohydrates, proteins, and fats. Some examples of these digestive enzymes include maltase, sucrase, lactase (to break down carbohydrates), peptidase (to break down proteins), and lipase (to break down fats).
Why are small cells better then large cells for moving materials through membranes?
small cells have a greater surface-to-volume ratio than larger cells.
What are small channels that form across the plasma membranes of adjacent cells?
Gap junctions are small channels that form across the plasma membranes of adjacent cells, allowing for direct communication and exchange of ions, small molecules, and signaling molecules between the cells.
What organelles inside the cell have membranes with many convolutions?
Cell membranes have many convolutions because they increasee the surface area to volume ratio, thus increasing the diffusion rate.
Thyroxine molecules are too large to pass through the plasma membranes of their target cells?
false- small
How does the vacoule look?
A vacuole usually looks like a liquid or gel filled, transparent membranes. They look a little like bubbles. They are small and scattered in animal cells while in plant cells they are big and prominent but are small in number and located at the centre.
How does cytokinesis in animal cells differ from cyoknesis in plant cells?
In animal cells cytokinesis occurs when a cleavage furrow(a groove in the cell surface) forms around the cell. This furrow narrows the cell across the centre and eventually pinches it into two new cells.In plant cells a cleavage furrow does not form. Instead a cell plate forms across the equator of the cell. The cell plate consists of small vesicles which fuse to form two membranes across the cell. The new membranes fuse with the existing cell membranes and a new cell wall forms between them.
Why does oxygen diffuse into the blood instead of the active transport?
Oxygen is a small molecule that can easily diffuse across cell membranes, including the membranes of red blood cells. This passive diffusion process is faster and more efficient than active transport for molecules like oxygen that are able to freely move across cell membranes.
Plasma membranes that have been isolated from red blood cell are not contaminted by internal cell membane?
Plasma membranes isolated from a red blood cell will not be contaminated with internal cell membrane (i.e. membrane from cell organelles - small structures found within cells) because red blood cells do not contain any organelles, so there will be no 'internal membrane' to contaminate.
In the small intestines folds in the cell membranes of intestinal does cells increase the cells' surface area and allow for greater transport of nutrients.?
In the small intestine, the folds in the cell membranes of intestinal epithelial cells, known as microvilli, significantly increase the surface area available for nutrient absorption. This enhanced surface area facilitates more efficient transport of nutrients, allowing for a greater amount of nutrients to be absorbed into the bloodstream. The intricate structure of these folds ensures that the intestine maximizes its capacity to absorb essential nutrients from digested food.
What digestive enzymes are located in the plasma membranes of cells in the lining of the small intestine?
The plasma membranes of cells in the lining of the small intestine contain brush border enzymes, which are responsible for the final breakdown of carbohydrates, proteins, and fats. Some examples of these digestive enzymes include maltase, sucrase, lactase (to break down carbohydrates), peptidase (to break down proteins), and lipase (to break down fats).
How does the structure of the membrane speed up or help speed up certain molecule transport without the use of energy?
Fluid membranes such as cellular membranes allow the passage of small and neutrally charged atoms and molecules, such as oxygen. In cells there are also carrier proteins that do not require ATP to transport larger molecules such as water.
What are 2 characteristics of substances that do not allow them to pass through semipermeable membranes of living cells?
Large molecular size and hydrophobicity are two characteristics that prevent substances from passing through semipermeable membranes of living cells. Large molecules cannot fit through the small pores of the membrane, while hydrophobic molecules are repelled by the hydrophilic nature of the phospholipid bilayer.
