Mer Scott
Quiz by , created more than 1 year ago

• Describe the basic structure and function of the nucleus. • Describe the structure of the nuclear pore complex and its role in nucleo-cytoplasmic exchange. • Describe the organisation of DNA within the nucleus. • Outline the functional differences between euchromatin and heterochromatin.

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Mer Scott
Created by Mer Scott almost 7 years ago
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L11 The Nucleus and DNA

Question 1 of 11

1

(Choose all correct.)
The nucleus:

Select one or more of the following:

  • is the most prominent organelle.

  • has a diameter of 5-10 micrometres.

  • is present in almost all cells.

  • contains all of the cell's genetic information

Explanation

Question 2 of 11

1

The membrane of the nucleus is the:

Select one of the following:

  • nucleomembrane

  • nuclear membrane

  • nuclear envelope

Explanation

Question 3 of 11

1

Choose the incorrect statement about the nucleus.

Select one of the following:

  • It has four layers of phospholipids.

  • It has complex protein structures called pores.

  • Its inner surface is lined nuclear lamina, which is made of intermediate filaments.

  • Fluid within the lumen of the nucleus maintains its spherical shape.

  • Intermediate filaments aid in organising and packing chromatin.

Explanation

Question 4 of 11

1

What is the consequence of a dysfunctional nuclear lamina? (Choose all correct.)

Select one or more of the following:

  • Abnormally shaped nuclei

  • Progeria syndrome

  • Cystic fibrosis

  • Cerebral palsy

  • Poor mitogenesis/meiosis

  • Accelerated ageing

  • Slow development

Explanation

Question 5 of 11

1

Choose the incorrect statement about the nuclear pores.

Select one of the following:

  • They allow mRNA, rRNA, and tRNA to exit.

  • It allows control signals into the nucleus.

  • It mediates passage into and out of the nucleus.

  • Energy and cellular materials move out of the nucleus.

Explanation

Question 6 of 11

1

How much DNA is in the human nucleus?

Select one of the following:

  • 2.5 cm

  • 2.5 m

  • 25 cm

Explanation

Question 7 of 11

1

DNA is packed in the nucleus so that it is inaccessible until replication.

Select one of the following:

  • True
  • False

Explanation

Question 8 of 11

1

The DNA double helix is about nm in diameter. Bundled into or "beads" using histone proteins, it is about nm in diameter. Further interaction with histone proteins this into a nm fibre. During replication this can be to form a nm diameter .

Drag and drop to complete the text.

    2
    nucleosomes
    H2a, H2b, H3, and H4
    10
    H1
    30
    looped
    coils
    300
    metaphase chromosome
    interphase chromosome

Explanation

Question 9 of 11

1

Which kind of chromatin is the denser, inactive form?

Select one of the following:

  • heterochromatin

  • euchromatin

Explanation

Question 10 of 11

1

The ratio of heterochromatin and euchromatin stays static during a cell's lifetime.

Select one of the following:

  • True
  • False

Explanation

Question 11 of 11

1

The location of chromosomes in the nucleus is not random.

Select one of the following:

  • True
  • False

Explanation

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