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What allows some molecules to pass through freely while limiting passage of other molecules?
Selective permeability of the membrane allows some molecules to pass through freely while limiting passage of others. This is achieved through various mechanisms such as size exclusion, charge interactions, and specific carrier proteins or channels. The composition and structure of the membrane play a crucial role in determining which molecules can cross.
Which structure in the wall of continuous capillaries allows for the passage of molecules into and out of the vessel?
intercellular clefts
What structure is required for osmosis?
A partially permeable membrane is required for osmosis to occur. This membrane allows the passage of solvent molecules (usually water) while preventing the passage of solute molecules.
Why NAD plus can be used to shuttle electrons?
NAD+ can shuttle electrons because it can accept electrons to become reduced to NADH, which can then donate those electrons to other molecules in the cell. This ability to cycle between oxidized (NAD+) and reduced (NADH) forms allows NAD+ to act as a carrier of high-energy electrons during processes like cellular respiration.
Glucose and no other sugar is transported into cells by protein carrier molecules in the cell surface membrane. How do carrier molecules specifically recognize glucose?
Carrier molecules have specific binding sites that are complementary to the structure of glucose molecules. This allows the carrier molecules to selectively recognize and transport glucose across the cell membrane while excluding other sugars. The specificity of recognition is determined by the shape, size, and chemical properties of both the carrier molecule and the glucose molecule.
Fenestrated capillaries have?
Pores (fenestrae) through the cells that allows the passage of large molecules such as protiens.
What occurs when substances move against the concentration gradient requires and the aid of carrier proteins?
Carrier molecules are molecules that play a role in transporting electrons through the electron transport chain. Carrier molecules are usually proteins bound to a nonprotein group; they can undergo oxidation and reduction relatively easily, thus allowing electrons to flow through the system. There are four types of carrier: flavoproteins (e.g. FAD), cytochromes, iron-sulphur proteins (e.g. ferredoxin), and ubiquinone.
What is ultra filtration?
The filtration of a colloidal substance through a semipermeable medium that allows only the passage of small molecules.
What is a small protein channel that allows the passage of ions and small molecules between cells?
A gap junction is a small protein channel that allows the passage of ions and small molecules between cells. Gap junctions play a crucial role in facilitating communication and coordination between cells.
What allows the passage of small molecules between animal cells?
Gap junctions allow the passage of small molecules and ions between animal cells. They consist of protein channels that connect the cytoplasm of adjacent cells, facilitating communication and the exchange of signaling molecules.
What controls the passage of molecules in and out of the cell?
Cell membrane controls the passage of molecules in and out of the cell through selective permeability. This allows specific molecules to pass through while preventing others from entering or exiting the cell. The cell membrane contains protein channels and pumps that regulate the movement of ions and molecules.
How do carrier proteins transport substances across membranes?
Carrier proteins bind to specific molecules on one side of the membrane, undergo a conformational change, and release the molecules on the other side. This process allows the substances to be transported across the membrane selectively.
