Question

Which of the following statements are INCORRECT?
(a)Some carrier or transport proteins allow diffusion only if two types of molecules move together
(b)Some carrier for Transport proteins allow only if two types of molecules move in the opposite direction
(c)Both symport and antiport come under facilitated diffusion as they need a carrier molecule to be transferred across the membrane
(d)All of the above

Answer 1

Hint: The movement of molecules from the region of higher concentration to the region of lower concentration of the molecules is known as diffusion which will continue until the grade II and has been eliminated. It allows the cells to gain useful substances which are required to obtain energy and grow and to get rid of the waste products.

Complete answer:
The spontaneous passive transport of molecules or ions across the biological membrane through transmembrane integral proteins is known as the facilitated diffusion or passive mediated transport. The transportation of molecules relies on the molecular binding between the cargo and the memory embedded channels or carrier proteins. The presence of an active binding event facilitates the temperature dependence which is compared to the free diffusion where the dependence on the temperature is mild. The facilitated diffusion occurs in the nucleoplasm and chromatin filaments where it is bound to the chromatin thread and is freely diffused in the nucleoplasm.

Additional Information: The diffusion of solutes through transport proteins is facilitated diffusion in the plasma membrane which is a type of passive transport. It involves protein transport and still passive transport because of the solute which is moving down the concentration gradient. Due to the hydrophobic nature of the lipids which makes up the cell membrane the polar molecules and ions do not easily diffuse across the cell membrane. The Three types of transport proteins which are involved in facilitated diffusion are gated channel proteins, channel proteins, and carrier proteins. The transport of protein in a pore in the membrane which lets the water molecules or small ions pass through them quickly is a channel protein whereas the gated channel protein is the transport protein that allows the molecule to pass through the membrane and opens a gate. The protein which is specific for an ion or a group of substances is a carrier protein that carries the ion is the molecule across the membrane by changing its shape after binding with the ion or molecule.

So, the correct answer is 'All of the above'.

Note: The process of diffusion is passive and needs no energy to be transferred for it to take place. The way particles move affects the rate of diffusion which is affected by the temperature. Membrane proteins facilitate diffusion and the surface area of membrane available affects the rate of diffusion.