nucleus Flashcards
Who discovered the nucleus and when?
Robert Brown (1831)
What is the nucleus called in prokaryotes?
Nucleoid/ Genophore
What is the nucleus called in prokaryotes?
Nucleoid/ Genophore
What are the components of the nucleus?
Nuclear membrane
Nucleolus
Nucleoplasm
Chromatin fibres
During what phase is the nucleus prominently observed?
Interphase
Who named the chromatin material present in the nucleus?
Flemming
What is the nucleoplasm also known as?
Karyolymph or Nuclear Sap
The membrane-less nucleolus present in the nucleus is formed by?
NOR- Nucleolar Organising Region
The Inter-Membranous Space in the nucleus is known as?
The Perinuclear Space
What is the cylinder like structure that acts like a door in the nuclear pore?
Annuli
What is the function of nuclear pore?
Two way movement of RNA and proteins between nucleus and cytoplasm
The nuclear membrane is also known as?
Karyotheca
The nuclear membrane is also known as?
Karyotheca
What is the function of the nucleolus?
It is the site of active ribosomal RNA synthesis
Role of nuclear membrane and nucleolus during cell division?
During cell division, the nuclear membrane and nucleolus disappear.
What are the enzymes present in the nucleoplasm?
DNA dependent DNA polymerase
DNA dependent RNA polymerase
Who observed the chromatin fibres?
Hoefmister (1948)
What are the two types of chromatin?
Euchromatin
Heterochromatin
Properties of euchromatin?
less condensed
DNA-transcriptionally active
Properties of heterochromatin
more condensed
DNA- transcriptionally less active
Components of chromatin
nucleosomes and DNA
Components of the nucleosome
Histone Proteins and DNA
The beaded string, upon condensation, forms a ________ followed by a ________
Solenoid, Chromosome
The primary construction of the chromosome is:
Centromere
Disc shaped structures present on the sides of the centromere are:
Kinetochores
What are the components of a chromosome?
2 kinetochores
2 chromatids
4 arms
1 centromere
Satellite
What are the types of chromosomes,
Types Centromere Shape
Metacentric centre V
Sub-meta. slightly away L
Acrocentric close to end J
Telocentric terminal rod like
Stain required to view nucleus?
Acetocharmine
Where are ribosomes synthesised?
Nucleolus
Components of ribosomes:
Ribonucleic acid (RNA)
Proteins