A phospholipid bilayer in the cell membrane (choose all...

A phospholipid bilayer in the cell membrane ______________ (choose all that apply) is semipermeable, and water can cross it by osmosis has enzymes and transporter proteins embedded in it none of the answers provided are correct is a total barrier to to the passage of oxygen and carbon dioxide is a characteristic of both prokaryote and eukaryote cell (plasma) membranes

Transcript

00:01 Let's answer this question is talk about the cell membrane.

00:03 Remember the cell membrane is a lipid bilayer.

00:06 This is one phospholipid, for example.

00:08 This is one.

00:09 Then you're going to have many photolipids that has a head and a tail.

00:13 This is one layer.

00:15 And here we're going to have the second layer of phospholipids.

00:21 This is the second layer.

00:22 Okay, so this is how the cell membrane is going to be arranged.

00:25 Also, this is a semi -permeable membrane because the core of this cell membrane is made of lipids, then only lipid soluble substances or molecules, lipid soluble or small molecules or poorly charged molecules, are going to be able to cross the cell membrane directly.

00:50 Okay, this is called simple diffusion.

00:53 But other molecules that are, for example, that are not lipid soluble or that are very big or that are heavily charged, they are not going to be able to cross a cell membrane directly.

01:03 So they are going to require some protein channels, for example, in order to cross a cell membrane.

01:10 This question says, phospholipid by layer in the cell membrane, choose all that apply.

01:15 Option a says is semi -permeable and water can cross it by osmosis.

01:20 And this is correct.

01:22 Water is a very small molecule, so it can cross a cell membrane directly.

01:26 Also, it is a semi -permable membrane.

01:28 Then we have a question of option b...

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