Mer Scott
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Objectives: Identify the major components of the cytoskeleton Explain how these structures regulate cell shape Describe the composition and origin of the ECM Outline the importance of cell junctions

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Mer Scott
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L8 The Cytoskeleton, ECM, and Cellular Junctions (Cell Shape Regulation)

Frage 1 von 11

1

Which statement about the cytoskeleton is INCORRECT?

Wähle eine der folgenden:

  • The cytoskeleton is a static structure.

  • The cytoskeleton helps maintain cell shape.

  • The cytoskeleton maintains organelles position.

  • The cytoskeleton is important for the movement of vesicles.

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Frage 2 von 11

1

Wähle von der Dropdown-Liste, um den Text zu vervollständigen.

The cytoskeleton is highly ( dynamic, reactive ), but still provides ( stability, some structure ).

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Frage 3 von 11

1

There are four components of the cytoskeleton: microtubules, microfilaments, intermediate filaments, and terminal ends.

Wähle eins der folgenden:

  • WAHR
  • FALSCH

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Frage 4 von 11

1

Choose the INCORRECT statement about the cytoskeleton's components.

Wähle eine oder mehr der folgenden:

  • Microtubules are the smallest filaments in the cytoskeleton.

  • Microfilaments are made up of a double chain of actin.

  • Microfilaments resist tension and are distributed in the outer cytoplasm (cortex).

  • Intermediate filaments are usually made of keratin, which is supercoiled into cables.

  • Intermediate filaments build the nuclear lamina, and anchor organelles.

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Frage 5 von 11

1

Microtubules resist , while microfilaments resist .

Klicke und ziehe, um den Text zu vervollständigen.

    compression
    tension

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Frage 6 von 11

1

Choose the CORRECT statements about microtubules.

Wähle eine oder mehr der folgenden:

  • Microtubules can make up flagella and cilia, allowing whole cell movements or movement of external fluid.

  • Microtubules often originate from the peroxisome.

  • Motor proteins travel along microtubules.

  • Microtubules are composed of α-tubulin and β-tubulin.

  • Microtubules are the most stable of the filaments.

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Frage 7 von 11

1

Microfilaments are the only filaments in the cytoskeleton that form 3D networks with proteins.

Wähle eins der folgenden:

  • WAHR
  • FALSCH

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Frage 8 von 11

1

Choose the statement about cell junctions which is CORRECT.

Wähle eine der folgenden:

  • Tight junctions form a continuous seal which prevents fluid loss.

  • Desmosomes provide pores between cells to transport ions and communicate via (a cytoplasmic connection.)

  • Gap junctions anchor adjacent cells, acting like a rivet.

  • Muscle cells have few desmosomes.

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Frage 9 von 11

1

Which statement about collagen in the ECM is NOT correct?

Wähle eine der folgenden:

  • Collagen makes up about 50% of total body protein.

  • Collagen resists compression.

  • Collagen is 'turned over', or, recycled.

  • Collagen is a glycoprotein secreted by fibroblasts.

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Frage 10 von 11

1

The base of the ECM is proteoglycan—an extensively sugared protein.

Wähle eins der folgenden:

  • WAHR
  • FALSCH

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Frage 11 von 11

1

Proteoglycan in the ECM resists tension and traps water.

Wähle eins der folgenden:

  • WAHR
  • FALSCH

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