Answer:
D. Porine
Explanation:
Mitochondria are double membrane-bound cell organelles. The outer and inner mitochondrial membranes are quite distinct from each other with respect to their structures and functions. The outer mitochondrial membrane is permeable to small molecules and ions. Permeability of the outer mitochondria membrane is mainly due to the presence of integral membrane protein porins which make transmembrane channels to allow the free movement of these substances across the outer membrane.
On the other hand, the inner membrane is quite impermeable to most small molecules and ions including protons as it does not have porins. A substance can cross the inner membrane only through specific transporters. The inner membrane has the components electron transport chain and the ATP synthase.
Plant cells obtain their energy by making their own food through the process of photosynthesis. Photosynthesis is a process by which carbon dioxide , water and light energy are utilized by plants to make energy-rich carbohydrates such as glucose. Plants store up the glucose as starch in their tissues. When plant cells needs energy, they simply take glucose molecules from their store of starch and use it in cellular respiration to produce ATP, the form of energy that the cell uses to function.
Animals on the other hand do not make their own food but ingest ready made food and break it down into its simplest units through the process of digestion. Complex carbohydrates are broken down to glucose units. Glucose is directly taken in by the animal cells where it is used in cellular respiration to produce ATP ,which fuels the cell activities.
Cells in the sponge<span> walls filter food from the </span>water<span> as the </span>water<span> is pumped through the body and the osculum ("little mouth").
The flow of </span>water<span> through the </span>sponge<span> is in one direction only, driven by the beating of flagella which line the surface of chambers connected by a series of canals.</span>
Sedimentary. The creature gets caught in the sediment and dies there, and after a while, it becomes a rock.
