AIIMS 2012
- Exam
- AIIMS
- Year
- 2012
- Subject
- Botany
- Chapter
- Cell Cycle and Cell Division
AIIMS 2012 · Botany · Cell Cycle and Cell Division
Beads on string like structures of A are seen in B , which further...
Beads on string like structures of are seen in , which further condense to form chromosomes in C stage of cell division.
A B C
Options
- AChromonema Chromatin Metaphase
- BChromatin Chromatid Metaphase
- CChromonema Chromosome Anaphase
- DChromonema Chromatid Anaphase.
Correct answer
A. Chromonema Chromatin Metaphase
Step-by-step solution
The "beads-on-a-string" structure is seen in electron microscope of isolated metaphase chromosomes. The chromonema form the gene bearing portions of the chromosome. Basically chromonema is made up of nucleosome chains. Nucleosome chain gives a beads on string appearance under electron microscope. Nucleosome is the fundamental packaging unit in eukaryotic chromosomes.