Answer: the membrane channel
Explanation:
In passive diffusion, the small water molecules can move across the phospholipid bilayer seen in blue. This layer acts as a semi-permeable or selectively permeable membrane; its hydrophilic heads are attracted to water (seen facing outwards) while its water-repellent hydrophobic tails face towards each other- allowing molecules of water to diffuse across the membrane along the concentration gradient.
Thus the water will move from an area of high concentration to an area of low concentration, until the system reaches a steady state called equilibrium- after this, there will be no net movement of water. Similarly via osmosis, the water passes through the membrane due to the difference in osmotic pressure on either side of the phospholipid bilayer this means that the water moves from regions of high osmotic pressure/concentration to regions of low pressure/ concentration to a steady state.
The dialysis tubing mimics a semi permeable membrane; it only allows water and small molecules of iodine to cross into the bag containing starch. The tubing is impermeable to starch; these large molecules require the aid of protein omplexes called membrane channels, in order to move across the membrane and against the concentration gradient.
The answer is D
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There are just 3 components of nucleotide: nitrogenous base, deoxyribose(sugar) and phosphate group. hope this helps :)
The pancreas is the organ that releases most of the digestive enzymes needed for chemical digestion. Since the food is entering from the stomach, much of the enzymes are alkaline to neutralize the acid & protect the small intestines.
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<span>As salma views a famous impressionist painting that is hung on a wall, her RETINAS receive visual information about the art and carry this information to her brain. At the back of each eye, the retina is a thin sheet of tissue containing several types of cells. The photoreceptor cells in the retina first transform light energy into electrical current. The last processing step in the retina is the activity of neurons calls retinal ganglion cells. The ganglion cells send electrical impulses along their axons, which form the optic nerve that travels into the brain.</span>