The lengthwise arrangement of DNA mainly consists of a phosphate group attached with :

1. Hexose sugar
2. Purines
3. Pentose sugar
4. Pyrimidines

The number of histone proteins associated with the DNA in a nucleosome is:

1. 6
2. 8
3. 4
4. 1

The figure given alongside was shown to students of class 10 in the laboratory under a compound microscope. They were told to observe the slide, identify the stage of mitotic cell division and mention the number of chromosomes which would be found in the daughter cells. Which of the following will be the correct response?

1. Anaphase, 8 chromosomes
2. Metaphase, 8 chromosomes
3. Anaphase, 4 chromosomes
4. Telophase, 4 chromosomes

The correct sequence of the following four major steps of karyokinesis during mitosis is :

(I) Chromatids convert into chromatin fibres.

(II) Chromatin fibres change to chromosomes.

(III) Chromosomes split into sister chromatids.

(IV) Chromatids move to opposite poles.

1. (I), (II), (III), (IV)
2. (II), (III), (IV), (I)
3. (III), (II), (IV), (I)
4. (IV), (I), (II), (III)