Cell Biology: Nuclear Envelope and Pores Quiz
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Questions and Answers

What is the primary function of the nuclear envelope?

  • To store ribosomes
  • To synthesize proteins
  • To facilitate cell division
  • To delineate the nucleoplasm (correct)

Which structural component is associated with the inner membrane of the nuclear envelope?

  • Endoplasmic reticulum
  • Nuclear lamina (correct)
  • Chromatin
  • Ribosomes

What are lamins primarily composed of?

  • RNA
  • Carbohydrates
  • Nucleotides
  • Proteins (correct)

Which feature distinguishes the outer membrane of the nuclear envelope?

<p>It is associated with ribosomes (B)</p> Signup and view all the answers

What is one of the roles of the nuclear lamina?

<p>To provide structural support for the nucleus (D)</p> Signup and view all the answers

What is the primary function of nuclear pore complexes?

<p>To regulate transport of macromolecules (B)</p> Signup and view all the answers

What shape do the nuclear pores resemble?

<p>Basketball hoop (D)</p> Signup and view all the answers

How do the numbers of nuclear pores vary within a cell?

<p>They increase with nuclear activity (B)</p> Signup and view all the answers

What symmetry is characteristic of the nuclear pore structure?

<p>Octagonal symmetry (D)</p> Signup and view all the answers

Which of the following components is NOT part of a nuclear pore complex?

<p>Mitochondrial Membrane (C)</p> Signup and view all the answers

Flashcards

Nuclear Pore Complex

A complex structure embedded in the nuclear envelope that regulates the transport of molecules between the nucleus and cytoplasm.

Cytoplasmic Filaments

Structures that extend from the nuclear pore complex into the cytoplasm, involved in transport.

Cytoplasmic Ring

Part of the nuclear pore complex located on the cytoplasmic side, forming a ring shape.

Nuclear Ring

Part of the nuclear pore complex located on the nuclear side, forming another ring shape.

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Nuclear Basket

A basket-like structure on the nuclear side of the pore complex, potentially involved in transporting molecules into the nucleus.

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Nuclear Envelope

The double-layered membrane that encloses the cell's nucleus, controlling entry and exit of molecules.

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Nucleoplasm

The gel-like substance inside the nucleus, containing the cell's DNA (chromatin).

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Nuclear Lamina

The protein network supporting the nuclear envelope, responsible for its structure and organization.

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Lamins

Fibrous proteins forming the nuclear lamina, a key component in nuclear structure.

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Outer Membrane

The outer layer of the nuclear envelope that connects to the endoplasmic reticulum and helps in protein synthesis.

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