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Cell: The Unit of Life > nucleus > Flashcards

nucleus Flashcards

1
Q

Who discovered the nucleus and when?

A

Robert Brown (1831)

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2
Q

What is the nucleus called in prokaryotes?

A

Nucleoid/ Genophore

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3
Q

What is the nucleus called in prokaryotes?

A

Nucleoid/ Genophore

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4
Q

What are the components of the nucleus?

A

Nuclear membrane
Nucleolus
Nucleoplasm
Chromatin fibres

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5
Q

During what phase is the nucleus prominently observed?

A

Interphase

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6
Q

Who named the chromatin material present in the nucleus?

A

Flemming

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7
Q

What is the nucleoplasm also known as?

A

Karyolymph or Nuclear Sap

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8
Q

The membrane-less nucleolus present in the nucleus is formed by?

A

NOR- Nucleolar Organising Region

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9
Q

The Inter-Membranous Space in the nucleus is known as?

A

The Perinuclear Space

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10
Q

What is the cylinder like structure that acts like a door in the nuclear pore?

A

Annuli

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11
Q

What is the function of nuclear pore?

A

Two way movement of RNA and proteins between nucleus and cytoplasm

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12
Q

The nuclear membrane is also known as?

A

Karyotheca

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13
Q

The nuclear membrane is also known as?

A

Karyotheca

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14
Q

What is the function of the nucleolus?

A

It is the site of active ribosomal RNA synthesis

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15
Q

Role of nuclear membrane and nucleolus during cell division?

A

During cell division, the nuclear membrane and nucleolus disappear.

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16
Q

What are the enzymes present in the nucleoplasm?

A

DNA dependent DNA polymerase
DNA dependent RNA polymerase

17
Q

Who observed the chromatin fibres?

A

Hoefmister (1948)

18
Q

What are the two types of chromatin?

A

Euchromatin
Heterochromatin

19
Q

Properties of euchromatin?

A

less condensed
DNA-transcriptionally active

20
Q

Properties of heterochromatin

A

more condensed
DNA- transcriptionally less active

21
Q

Components of chromatin

A

nucleosomes and DNA

22
Q

Components of the nucleosome

A

Histone Proteins and DNA

23
Q

The beaded string, upon condensation, forms a ________ followed by a ________

A

Solenoid, Chromosome

24
Q

The primary construction of the chromosome is:

A

Centromere

25
Q

Disc shaped structures present on the sides of the centromere are:

A

Kinetochores

26
Q

What are the components of a chromosome?

A

2 kinetochores
2 chromatids
4 arms
1 centromere
Satellite

27
Q

What are the types of chromosomes,

A

Types Centromere Shape
Metacentric centre V
Sub-meta. slightly away L
Acrocentric close to end J
Telocentric terminal rod like

28
Q

Stain required to view nucleus?

A

Acetocharmine

29
Q

Where are ribosomes synthesised?

30
Q

Components of ribosomes:

A

Ribonucleic acid (RNA)
Proteins

Cell: The Unit of Life (9 decks)

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