Answer:
The mechanisms of transport across the cell membrane are as follow: 1- simple diffusion, 2- facilitated diffusion, 3- primary active transport and 4-secondary active transport
Explanation:
The cell membrane is a selectively permeable structure capable of transporting substances by different mechanisms. Simple diffusion is a type of passive transport (i.e. does not require energy) where non-polar molecules (e.g. O2, CO2) pass across the membrane by a process that does not require energy from the cell. Facilitated diffusion is another type of passive transport where larger polar molecules (e.g., glucose and amino acids) pass across the membrane by using specific transmembrane integral proteins. On the other hand, primary active transport is a type of active transport that uses chemical energy (e.g., ATP) to move substances such as metal ions (Na+, K+, Ca2+) across the cell membrane against their concentration gradient. Finally, secondary active transport is another type of active transport where transporter proteins are used to couple the movement of ions (e.g., H+ protons) down their electrochemical gradient to the transport of another ions/solutes against their concentration/ electrochemical gradient.
Answer:
the ratio of the surface area to the volume is 1:2
Answer:
Asking students to wash their hands on routine basis and also to keep the area clean.
Explanation:
Hand sanitization is very important and hence considered as a primary step to control infection. Students should wash their hands on routine basis. Also, they should keep the area clean.
Answer:
The enzyme you will be studying in this experiment is lactase, and the reaction it catalyzes is the hydrolysis of the disaccharide lactose into the monosaccharides galactose and glucose.
Explanation:
