the answer for the first one is B
and the second is B
The answer would most likely be B, diffusion. Diffusion is the process of molecules going from an area of higher concentration of those particles (around Tammy) to an area of lower concentration (around Jim who is across the room), without the use of energy, as they are going with the concentration gradient (higher concentration to lower concentration). In this question, the molecules would be the molecules of Tammy's perfume. The area around her has a higher concentration of perfume particles, as she sprayed the perfume on herself. The area around Jim would be the area of lower concentration, as there are less molecules of perfume around him. Osmosis is the diffusion of water molecules from an area of higher water concentration to an area with a lower water concentration through a semi-permeable membrane. Active transport is the process of diffusion, however, it requires energy as the molecules go across their concentration gradient (from low concentration to high concentration). Facilitated diffusion is the process by which molecules go from a higher concentration to a lower concentration. However, the molecules go through a cell's membrane with the aid of proteins on the membrane. Therefore the answer would be diffusion.
Answer:
In muscle cell, fermetation produces <u>"lactate and NAD"</u>
<u>In fermentation Pyruvate is reduced and __NADH__ is oxidized.</u>
Explanation:
Muscle cells perform lactic acid fermentation when enough oxygen is not available to support aerobic cellular respiration. The process of glycolysis forms two molecules of pyruvate from one glucose molecule and uses NAD+ as electron acceptor. During lactic acid fermentation, pyruvate is reduced into lactate and NADH serves as an electron donor. The final products are lactate and NAD+. The reaction is catalyzed by lactate dehydrogenase enzyme. The NAD+ produced by fermentation is required to continue the process of glycolysis.
In
cell-cell contact , signals pass through a cell junction from one cell to adjacent cells.
Membrane-bound signals bind to receptors on adjacent cells in the process of
paracrine signalling.
An example of
autocrine signalling is when cells release signals that affect themselves and nearby target cells.
In
synaptic signalling cells release signals that affect nearby target cells. Cells release signals that travel long distances to affect target cells during
endocrine signalling.
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