Answer:
Moving against the concentration gradient, or in simpler terms, moving from a low-concentration area to a high-concentration area.
Explanation:
This action uses energy, as according to entropy, the substance will move from a higher concentration to a lower concentration, and cells have to put extra energy to pump the molecules / substance up the concentration gradient.
It is mostly used to trigger chemical responses in cells, like in neuron synapses.
Hope this helped!
Answer:
As the plasma membrane grows and accumulates more contents it will require more cell membrane to survive.
Explanation:
Plasma membrane is functionally significant layer that surrounds the cytoplasm of a cell.Plasma membrane performs many important cellular functions.For example transport of specific substance in and out of the cell,contain various protein that act as receptor,the oligosaccharide side chain of the glycoprotein moiety present within the plasma membrane recognizes various bio active compounds.
When a cell grow it increases in size beside increasing its cellular constituents.To surround or protect these cellular constituents more plasma membrane should be need by the cell for its survival.
Answer:
having a weak economy, weak base of future generations
Explanation:
Unicellular organisms are devoid of circulatory systems and will be found living in moist or watery environments to facilitate uptake of nutrients and gases and expulsion of waste by the process of diffusion.
Their cell is structured such that it can engage in direct exchange of substances with its environment. Water serves as the perfect medium or environment through which this exchange can occur.
Gases and nutrients simply diffuse into the cell or are moved into the cell by means of active transport or phagocytosis.
Answer:
15
Explanation:
Gametes have half the amount of dipliod somatic ells
