The cell membrane consists of a phospholipids b...

The cell membrane consists of a. phospholipids. b. glycoproteins. c. glycolipids. d. carbohydrate chains. e. All of the above. The role of the integral protein is to a. create a barrier. b. allow ions into the cell. c. maintain fluidity at low temperatures. d. recognize a cell as safe. e. All of the above. The role of cholesterol is to a. create a barrier. b. allow ions into the cell. c. maintain fluidity at low temperatures. d. recognize a cell as safe. e. All of the above. Active transport is associated with a. the phospholipid bilayer. b. integral proteins. c. glycoproteins. d. carbohydrate chains. e. cholesterol. Passive transport relies on a gradient of a. concentration. b. energy. c. polarity. d. charge. e. All of the above. The hydrophobic interior of the lipid bilayer is largely responsible for controlling the movement of a. small non-polar molecules. b. sodium ions. c. carbon dioxide. d. oxygen. e. water. Osmosis describes the movement of water across a. a permeable membrane. b. an impermeable membrane. c. a semi-permeable membrane. d. a living membrane. e. a salt gradient. A hypertonic solution outside a cell allows a. net water loss to the cell. b. net water gain to the cell. c. water to leave and enter at the same rate. d. the membrane to expand and break. e. the loss of ions from the cell. Exocytosis involves all of these steps but NOT a. secretion of materials like a hormone. b. vesicle fusion with the cell membrane. c. movement of large particles. d. excretion of waste material from the cytoplasm. e. receptor proteins that pull in particles. A hypotonic solution outside a cell allows a. net water loss to the cell. b. net water gain to the cell. c. water to leave and enter at the same rate. d. the membrane to shrink and break. e. the loss of ions from the cell.

Transcript

00:01 Okay, i'm going to talk to this question.

00:02 Look at the options of each question and let's find the correct answer.

00:06 Question number one says the cell membrane consists of a option a says host polypids and well this is true.

00:13 Okay, option a is true because mainly the cell membrane is made of phospholipids.

00:19 This is one phospholipid, another phospholipid, another phospholipid, another phospholipid, and there is going to be another layer that is going to be arranged like this.

00:26 Okay, so it is a lipid bilayer because it has two layers.

00:29 Okay, so this is true.

00:30 Option b says glycoproteins, and this is also true because there are going to be some glycoproteins here on the cell membrane also.

00:38 Option c says glycolipids, and this is also true because there are going to be some glycolipids found here in the cell membrane.

00:46 And then we have option d that says carbohydrate chains, and this is also true.

00:54 Okay, so practically the appropriate answer here for this question.

00:57 It's on to be option e that says all of the above.

01:00 This is going to be the answer for the question.

01:02 Question number one.

01:04 Then we have question number two.

01:06 Question number two says the goal of the integral protein is two.

01:11 And option a says, create a barrier.

01:14 And this is false, okay? the function of the integral proteins, for example, here this graphic, an integral protein, it is going to be like this.

01:24 And here we're going to continue having your fossil lipids.

01:29 An integral protein, the function is not a, the function of an integral protein is not going to be too.

01:34 To work as a barrier, okay? it is going to allow some molecules to move across a cell membrane.

01:39 Specifically those molecules that are heavily charged, like ions for example, or those that are very big, or those that are not lipid soluble.

01:58 Okay, so option b says allow ions into the cell and this is true.

02:02 Okay, allow ions into the cell because ions are heavily charged so they are not going to be able to cross a cell directly, but they are going to be to use integral proteins.

02:11 Option cs is maintained fluid at low temperature.

02:14 This is false.

02:15 Option this is recognized a cell as safe energy to pulse.

02:19 Okay, this is a role of a peripheral protein.

02:22 Then we have question number three that says, the goal of cholesterol is two and option a says create a baby.

02:29 This is also false.

02:31 This is not a function of cholesterol.

02:32 The main function of cholesterol is going to be found like here.

02:37 Okay, it is going to it is going to evaluate the fluidity of the cell membrane.

02:43 So we have that option b says allow ions into the cell.

02:46 This is false.

02:47 Option c says maintain fluidity at low temperatures, and this is correct.

02:51 Okay, so option, option c is the correct answer for this question.

02:55 Then we have option, a question four that says active transport is associated with, remember that active transport, if it is yourself.

03:05 Okay, this is the sodium potassium atp, the classic example of, active transport, is going to move sodium up the concentration gradient.

03:15 It means remember that this is the extracellular space and this is a similar space.

03:19 The concentration of sodium are higher here and lower here.

03:24 So normally when we move a substance down the concentration gradient and we don't use atp is when sodium moves in this direction.

03:35 But what happens when we move in the opposite direction, like in this case? it means from low concentration to high concentrations, then it is an active transport, and it is going to require atp.

03:47 Okay? and potassium is going to move in the opposite direction.

03:50 Well, this pump is going to do that...

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