FREE NEET Biology Practice MCQ Test: Cell Cycle And Cell Division Exercise 2 Questions Answers With Detailed Explanations [PDF]

Answer: (d)

Answer: (c)

Number of chromatids at metaphase is two each in mitosis and meiosis. Chromatid is a half chromosome during duplication in early prophase and metaphase of mitosis and between diplotene and the second metaphase of meiosis. After these stages chromatids are called a daughter chromosomes.

Answer: (a)

Answer: (a)

Nucleolus and nuclear membrane always disappears during mitosis and meiosis. At the beginning of mitosis, the chromosomes condense, the nucleolus disappears, and the nuclear envelope breaks down, resulting in the release of most of the contents of the nucleus into the cytoplasm. At the end of mitosis, the process is reversed. In diakinesis stage of prophase I of meiosis I, nucleolus and nuclear membrane disappear and chromosomes set free in the cytoplasm.

Answer: (a)

Mitosis is characterised by equal division because the chromosome numbers in the daughter cells remains same as that of the parent cell. Reduction division is the characteristic of meiosis.

Answer: (c)

Answer: (b)

At prophase I, DNA replication has already occurred, and the original amount of DNA has been doubled to x. At anaphase I, the amount of DNA in the cell remains the same because no cytokinesis has occurred yet to separate the cytoplasm.

Answer: (d)

A = Diplotene B = Dissolution C = Pachytene D = Anaphase - II

Answer: (b)

Pair of anaphase I with their feature is correctly matched.

Metaphase I: Spindle apparatus appear and the chromosomes are arranged on equatorial plate, with the centromeres towards the pole. Spindle fibres become attached to the centromeres of the two homologous chromosomes.

Interphase: It is the time during which cell is preparing for division by undergoing both cell growth and DNA replication. Prophase I: It is the lengthy phase when compared with mitotic phase. It is subdivided into 5 subphases: leptotene, zygotene, pachytene, diplotene and diakinesis.

Answer: (d)

Answer: (b)

Answer: (d)

Answer: (d)

Answer: (c)

Answer: (d)

Answer: (b)

Answer: (b)

During diplotene in prophase I of meiosis I dissolution of the nucleoprotein synaptonemal complex occurs.

Answer: (d)

Answer: (b)

Microtubules are unbranched hollow submicroscopic tubules of protein tubulin which develop on specific nucleating regions and can undergo quick growth or dissolution at their ends by assembly or disassembly of monomers. Microtubules form spindle during cell division. Centrioles help in cell division by forming spindle poles or microtubules. In animal cells, microfilament collect in the middle region of the cell below the cell membrane. They induce the cell membrane to invaginate.

In plant cells, cell plate is formed to separate the two daughter cells. Some of the spindle fibres called interzonal microtubules are deposited around phragmoplast. Vesicles from Golgi apparatus are deposited and coalesce on the phragmoplast to form a cell plate.

Answer: (d)

Interkinesis or interphase II is a period of rest that cells of some species enter during meiosis, between meiosis I and meiosis II. No DNA replication occurs during interkinesis however does occur during the Interphase I stage of meiosis. Interkinesis is generally short lived.