FREE BIOLOGY AND STUDY GAMES ABOUT BIOLOGY

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FREE BIOLOGY AND STUDY GAMES ABOUT BIOLOGY

CHAPTER 5 EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -103 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: List all 3 ways of moving molecules or ions across the selective permeably membrane.

Answer:

Diffusion, facilitated diffusion, and active transport.

Question 2: Name 2 major types of diffusion that carries out passive transport.

Answer:

Simple diffusion and facilitated diffusion.Question 3: Osmosis is affected by the ____ solute concentration, not by ____ solute concentration.

Answer:

total; individual

Question 4: Describe facilitated diffusion by transporters.

Answer:

A solute binds in a hydrohilic pocket exposed on one side of the membrane. Then the transported undergoes a conformational change that switches the exposure of the pocket to the other side of the membrane, where the solute is then released.

Question 5: Phago = ?

Answer:

To eat Question 6: What are the three factors that dictate the fluidity of the membrane?

Answer:

The length of the hydrocarbon tails, the presence of unsaturated fatty acids, and the presence of steroids.

Question 7: Integral membrane proteins are ______ in the membrane

Answer:

Embedded

Question 8: How will swelling affect animal cells?

Answer:

The animal cell could end up lysing (bursting).

Question 9: What is a plasma membrane made up of?

Answer:

A double layer of phospholipid molecules.

Question 10: What region is the exposed part of a glycoprotein?

Answer:

Carbohydrate region

Question 11: What is the difference between a phospholipid and a triglyceride?

Answer:

A trygliceride is a glycerol attached to 3 fatty acids while a phospholipid is only attached to 2 fatty acids.

Question 12: How is a lipid anchored protein attached to the membrane?

Answer:

Covalently bound to an amino acid side chain within the protein.

Question 13: Name 3 factors that affect the diffusion rate.

Answer:

Size of the molecules, temperature of the environment, and the concentration gradient of the molecule.Question 14: Chemical reactions that occur on or near the membrane need what nearby to facilitate these reactions?

Answer:

Enzymes

Question 15: In the outer layer, which way do the hydrophilic heads point?

Answer:

They point outward

Question 16: How will swelling affect plant cells?

Answer:

The plant cell's nucleus will look more like a kidney bean due to the central vacuole having a higher volume.Question 17: How will water move in an isotonic condition? Will the cell size change?

Answer:

The amount of water that moves to inside the cell will be the same amount that moves to outside the cell. Therefore there will be no cell size change.Question 18: What regions are likely binding sites for peripheral membrane proteins?

Answer:

Polar heads of phospholipids and hydrophilic regions of integral membrane proteins.

Question 19: Why are some substances more permeable than others?

Answer:

The innter portion of the membrane is hydrophobic, which causes polar molecules more likely to be rejected as it tries to pass through. Large molecules are also usually too large to go through the small space between lipid heads.

Question 20: Why don't plant cells risk lysing unlike animal cells?

Answer:

Plant cells have cell walls that are able to resist lysing because the wall prevents the cell from taking in too much water. Animal cells don't have cell walls.Question 21: What two types of facilitated diffusion that occur across the plasma membrane?

Answer:

Facilitated diffusion by channel proteins and facilitated diffusion by transporters.Question 22: Why is a phospholipid molecule ideal for making cellular membranes as opposed to a saturated or unsaturated triglyceride?

Answer:

Because they are made of both saturated and unsaturated fatty acids, therefore making the cell membrane dense enough and solid enough to give shape fluid enough to allow molecule movement.

Question 23: How is a sodium potassium pump activated?

Answer:

By the hydrolysis of an ATP molecule.Question 24: If a cell has a 1% solute concentration on the inside and a 1% solute on the outside, what condition is this?

Answer:

Isotonic

Question 25: Lipid anchored proteins are ______ the membrane

Answer:

Partly in

Question 26: Give an example of phagocytosis.

Answer:

White blood cells will eat bacteria when they encounter them.

Question 27: Name the 3 types of endocytosis.

Answer:

Phagocytosis, pinocytosis, and receptor-mediated endocytosis.