Answer:
The sodium-potassium pump is a mechanism of active transport that moves sodium ions out of the cell and potassium ions into the cell, both against a concentration gradient, in order to maintain the proper concentrations of both ions inside and outside the cell and to thereby control membrane potential.
Explanation:
D. Chlorophyll
Chlorophyll has been found in many pants that use photosynthesis. Without chlorophyll, plants would be able to absorb sunlight as a source of food.
the community would be filled with insects like flies, dragonflies, misqotioes ect
Answer:
b). activation of T cells
Explanation:
An APC (antigen-presenting cell) can be described as an immune cell, which detects, uptakes, and informs the acquired immune response when an infection takes place. B cells, macrophages, and dendritic cells are antigen-presenting cells.
These cells play an important role in activation of T cells. T cells are unable to recognize soluble or free antigens and can only recognize antigens processed and presented by carrier molecules, such as MHC molecules.
Presence of MHCII molecules is a defining feature of APCs that process and present antigens to T cells. Hence, all antigen-presenting cells help in activation of T cells.
Thus, the correct answer is option (b).
Fatty acids vary in their degree of saturation or unsaturation due to their number of :Double bonds