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Concept explainers
Please write a paragraph examining each molecules (starch, iodine, and glucose) and why it was not able to cross the membrane.
(PLEASE USE THE TERM: Diffusion, osmosis, pores, concentration gradient)
*A paragraph does not need to be specific.
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Answer- Cell membrane also called as plasma membrane is the outermost layer of all the living cells in both prokaryotes and eukaryotes.
It is made up of lipid bilayer having hydrophilic heads on the outer and inner side and middle portion have hydrophobic tails. This polarity and lipid nature of the plasma membrane allows selective transport of the ions and other nutrients.
In the plasma mambrane there are many integral proteins, pheripheral proteins, Sugar molecules and some cholesterol molecules present on the surface.
Integral proteins help solely in the transportation (Facilitated transport) of other nutrients and solutes in and out of the cell which can not be diffused directly through lipid bilayer.
Nutrients can be transported by active and passive transport. Active transport requires ATP whereas passive transport does not requires ATP as an energy source.
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- _____ ions are relatively impermeable to the cell membrane, they are let into the cell by gated channels (channel mediated facilitated diffusion).arrow_forwardIf a person were to hypothetically drink a very large volume of plain tap water, his/her cells would __________.arrow_forwardThe tendency of molecules (particles) to extend or spread out from a region of higher concentration to a region of lower concentration. active transport diffusion facilitated diffusion osmosisarrow_forward
- Why is glucose being represented as line B? arrow_forwardThe lipid bilayer has membrane proteins spanning the membrane. They have a hydrophobic region embedded in the _______________ while the hydrophilic regions are on the ______________ and _______________ of the cell.arrow_forwardMicrovilli are commonly seen in cells involved in absorption of materials (like intestinal cells) because: none of the above they move cells forward they produce greater surface area of plasma membrane they move substances forwardarrow_forward
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