Answer:
Generally, aquaporins are found in the membranes of plants and also in the membranes of animals. It is a transporter, which takes part in mediating or regulating the flux of water across the membranes. A cell expresses the aquaporin protein due to many factors:
1. They function as sensors of gradients in turgor pressure and osmotic potential.
2. Aquaporins can assist in regulating and maintaining water permeability in response to different stresses like salt, drought, chilling, and others as water can move at a much greater speed through aquaporins.
3. Aquaporins can help in the movements of carbon dioxide, H2O2, NH3 through the plasma membrane briskly. Thus, the expression of aquaporin is essential for various species.
Answer:
Iodine, or more accurately iodide (I-), is avidly taken up from blood by thyroid epithelial cells, which have on their outer plasma membrane a sodium-iodide symporter or "iodine trap". Once inside the cell, iodide is transported into the lumen of the follicle along with thyroglobulin.
Explanation:
Some of the carbon atoms in the glucose exit the leaf as carbon dioxide during respiration while other carbon atoms are used to make important parts of the plant, such as additional leaves or wood. Carbon atoms that remain in leaves will either fall off (during plant senescence) or become a meal for an animal. Hope this helps
Phytoplankoton are the primary energy producers of the ocean ecosystem. They create the energy from the light sources such as sun. They convert the obtained light energy into carbohydrates by the process of photosynthesis. The energy produced by the phytoplankton is not consumed by it. These are the important food sources for the aquatic animals in order to support the food chain. These are considered as the foundation of the aquatic food web. These phytoplanktons even cause death of the organisms. When the phytoplankton die it sinks to the bottom of the water body and the bacteria which feed on the dead phytoplankton release oxygen making the marine life suffocating. These phytoplanktons produce chemical energy from sun light. These produce carbohydrates by utilising carbon dioxide from atmosphere resulting in water and oxygen as the end product.
Therefore, Phytoplanktons act as PRODUCERS in an ocean ecosystem.