Nuclear Envelope Quiz

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What is the function of the nuclear envelope?

Stores excess genetic material
Synthesizes proteins for the cell
Provides energy for the cell
Regulates the passage of substances into and out of the nucleus and protects the genetic material (correct)

What are the components of the nuclear envelope?

Mitochondria and lysosomes
Endoplasmic reticulum and Golgi apparatus
Ribosomes and vesicles
Outer nuclear membrane and inner nuclear membrane (correct)

What is the function of the nuclear pore complex?

Forms tiny holes in the nuclear envelope to allow molecules to pass between the nucleus and the cytoplasm (correct)
Regulates the cell's metabolism
Stores excess proteins for the cell
Produces energy for the cell

What is the relationship between the outer nuclear membrane and the rough endoplasmic reticulum (RER)?

The outer nuclear membrane is continuous with the rough endoplasmic reticulum (C) Signup and view all the answers

What is the composition of the nuclear pore complex?

Over 30 different proteins (C) Signup and view all the answers

What lines the inner surface of the nuclear envelope?

Nuclear lamina, a network of protein filaments (D) Signup and view all the answers

What regulates the size of the pore opening in the nuclear envelope?

Nucleoporins (C) Signup and view all the answers

What allows molecules to pass between the nucleus and the cytoplasm?

Nuclear pores (C) Signup and view all the answers

What is the function of the inner nuclear membrane?

Continuous with the nuclear lamina (C) Signup and view all the answers

What is the function of the outer nuclear membrane?

Continuous with the rough endoplasmic reticulum and studded with ribosomes (A) Signup and view all the answers

What allows molecules such as RNA and proteins to pass between the nucleus and the cytoplasm?

Nuclear pores (A) Signup and view all the answers

What regulates the passage of substances into and out of the nucleus?

Nuclear envelope (A) Signup and view all the answers

What is the role of the nuclear lamina?

Provide structural support for the nucleus and help organize the nuclear envelope and chromatin (C) Signup and view all the answers

Which proteins compose the nuclear lamina?

Lamin A, lamin B, and lamin C (C) Signup and view all the answers

What is the basic unit of chromatin?

Nucleosome (B) Signup and view all the answers

What is the role of the nucleolus?

Site of ribosome biogenesis (D) Signup and view all the answers

What is the composition of the RNA in the nucleolus?

Ribosomal RNA (rRNA) (A) Signup and view all the answers

What is the function of the nucleolus in protein synthesis?

Essential for making ribosomes and synthesizing proteins (B) Signup and view all the answers

What is the function of chromatin organization?

Important for gene regulation and makes it more difficult for transcription factors to access the DNA (B) Signup and view all the answers

What is the composition of the DNA in the nucleolus?

Ribosomal DNA (rDNA) (B) Signup and view all the answers

Which structure is formed by the compaction of nucleosomes?

Chromatin fibers (A) Signup and view all the answers

What is the role of the nuclear lamina in nuclear import and export?

Plays a role in nuclear import and export (D) Signup and view all the answers

What is the function of chromatin compaction?

Makes DNA more compact to fit into the nucleus (B) Signup and view all the answers

What is the highest-order structure of chromatin?

Chromosomes (D) Signup and view all the answers