Christina Marshall
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Biology Quiz am Bio 110 Final: Chapter 5, erstellt von Christina Marshall am 12/12/2017.

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Christina Marshall
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Bio 110 Final: Chapter 5

Frage 1 von 10

1

Which of the following statements best describes the chemical composition of biological membranes?

Wähle eine der folgenden:

  • Biological membranes are bilayers of proteins with associated lipids and carbohydrates

  • Biological membranes are composed of two layers-- one layer of phospholipids and one layer of proteins

  • Biological membranes are bilayers of phospholipids with associated proteins and carbohydrates

  • Biological membranes are composed of equal numbers of phospholipids, proteins, and carbohydrates.

  • Biological membranes are composed of lipids with proteins attached to the outer surface.

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Frage 2 von 10

1

Which of the following events in a biological membrane can never be energetically favorable and therefore will not occur spontaneously ?

Wähle eine der folgenden:

  • The rotation of phospholipids

  • the lateral movement of phospholipids

  • the flip-flop of phospholipids to the opposite leaflet

  • the rotation of membrane proteins

  • the lateral movement of membrane proteins

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Frage 3 von 10

1

Let's suppose an insect, which doesn't maintain a constant body temperature, was exposed to a shit in temperature from 60 to 80 degrees F. Which of the following types of membrane changes would be the most beneficial to help this animal cope with the temperature shift?

Wähle eine der folgenden:

  • increase the number of double bonds in the lipid tails of phospholipids

  • increase the length of the lipid tails of phospholipids

  • decrease the amount of cholesterol in the membrane

  • decrease the amount of carbohydrate attached to membrane proteins

  • decrease the amount of carbohydrate attached to phospholipids

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Frage 4 von 10

1

Carbohydrates in the plasma membrane

Wähle eine der folgenden:

  • are bonded to a protein or lipid

  • are located on the outer surface of the plasma membrane

  • can function as cell markers for recognition by other cells

  • all of the above

  • a and c only

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Frage 5 von 10

1

A transmembrane protein in the plasma membrane is glycosylated at two sites in the polypeptide sequence. Where in this protein would you expect these two site to be found?

Wähle eine der folgenden:

  • in the transmembrane segments

  • in hydrophilic regions that project into the extracellular environment

  • in hydrophilic regions that project into the cytosol

  • could be anywhere

  • b and c only

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Frage 6 von 10

1

The tendency for Na+ to move into the cell can be due to

Wähle eine der folgenden:

  • the higher numbers of Na+ outside the cell, resulting in a chemical concentration gradient.

  • the net negative charge inside the cell attracting the positively charged Na+.

  • the attractive fore os K+ inside the cell pulling Na+ into the cell.

  • All of the above

  • a and b only.

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Frage 7 von 10

1

Let's suppose the solute concentration inside the cell of a plant is 0.3M and outside is 0.2M. If we assume the solutes do not readily cross the membrane, which of the following statements best describes what will happen?

Wähle eine der folgenden:

  • The plant cells will lose water, and the plant will wilt.

  • The plant cells will lose water, which will result in a higher turgor pressure.

  • The plant cells will take up a lot of water and undergo osmotic lysis.

  • The plant cells will take up a little water and have a higher turgor pressure.

  • Both a and b are correct.

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Frage 8 von 10

1

What features of a membrane are major contributors to its selective permeability?

Wähle eine der folgenden:

  • Phospholipid Bilayer

  • Transport Proteins

  • Glycolipids on the outer surface of the membrane

  • Peripheral membrane Proteins

  • both a and b

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Frage 9 von 10

1

What is the name given to the process in which solutes are moved across a membrane against their concentration gradient?

Wähle eine der folgenden:

  • simple diffusion

  • facilitated diffusion

  • osmosis

  • passive diffusion

  • active transport

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Frage 10 von 10

1

Large particles or large volumes of fluid can be brought into the cell by

Wähle eine der folgenden:

  • facilitated diffusion

  • active transport

  • endocytosis

  • exocytosis

  • all of the above

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