Prophase

Q. Match the following events that occur in their respective phases of cell cycle and select the correct option:

Column - I	Column - II
(a)	$G_1$ phase	(i)	Cell grows and organelle duplication
(b)	S phase	(ii)	DNA replication and chromosome duplication
(c)	$G_2$ phase	(iii)	Cytoplasmic growth
(d)	Metaphase in M-phase	(iv)	Alignment of M-phase chromosomes

1. $\left(a\right)-\left(ii\right),\left(b\right)-\left(iii\right),\left(c\right)-\left(iv\right),\left(d\right)-\left(i\right)$
2. $\left(a\right)-\left(iii\right),\left(b\right)-\left(iv\right),\left(c\right)-\left(i\right),\left(d\right)-\left(ii\right)$
3. $\left(a\right)-\left(iv\right),\left(b\right)-\left(i\right),\left(c\right)-\left(ii\right),\left(d\right)-\left(iii\right)$
4. $\left(a\right)-\left(i\right),\left(b\right)-\left(ii\right),\left(c\right)-\left(iii\right),\left(d\right)-\left(iv\right)$

Q. The graph shows the changes in DNA content during various phases (1 to 4) in a typical cell. Identify the phase and select the correct option.

1. 1-G${}_2$, 2-G${}_1$, 3-S, 4-M
2. 1-M, 2-G${}_2$, 3-S, 4-G${}_1$
3. 1-G${}_1$, 2-S, 3-G${}_2$, 4-M
4. 1-M, 2-G${}_1$, 3-S, 4-G${}_2$

Q.

When do centrioles split and go to the poles of the cell?

1. During Anaphase

2. Beginning of Prophase

3. Beginning of metaphase

4. End of prophase

Q. During which stage of meiosis, do the sister chromatids begin to move towards the poles?

1. Prophase-I
2. Telophase-I
3. Anaphase-II
4. Anaphase-I

Q. The association of histone H1 with a nucleosome indicates that

1. transcription is occurring
2. DNA replication is occurring
3. DNA is condensed into a chromatin fibre
4. DNA double helix is exposed

Q.

As per the central dogma, how is the flow of genetic information?

Q. Histone proteins in nucleosome are:

1. $H2A,H2B,H2C,H2D$
2. $H2A,H2B,H3,H4$
3. $H1,H2,H3,H4$
4. Pepsin, Rennin, Creatin, Trypsin

Q.

What would happen if telophase is skipped?

Q.

Do Eukaryotic cells have fimbriae?

Q.

The nuclear membrane and nucleolus reappear during

1. Prophase

2. Metaphase

3. Anaphase

4. Telophase

Q. A post-reproductive cell remains in phase :

1. $G_1$
2. $G_0$
3. $G_2$
4. $M$

Q. In prophase mitosis, which one of the following events occurs in animal cells but not in plant cells?

Q.

Can cell division reproduce an entire organism?

Q. What is Totipotency?

Q.

IS IT TRUE THAT CHROMOSOME CONTAIN GENE and gene contains DNA?

Q.

What is Deoxyribonucleic acid?

Q.

At the end of prophase:

1. All of these

2. Irregularly scattered positions

3. Two chromatids each

4. A single centromere each

Q. Which of the following stage of meiosis is responsible for deciding genetic constitution of gametes?

1. Metaphase-II
2. Anaphase-II
3. Metaphase-I
4. Anaphase-I

Q. Assertion: Mitosis is known as equational division and meiosis is known as reduction division.
Reason: During meiosis, the non-sister chromatids of homologous chromosomes cross-over and exchange genetic information. This step does not occur during mitosis.

1. Both the assertion and reason are true and the reason is the correct explanation of the assertion
2. Both the assertion and reason are true but the reason is not the correct explanation for the assertion
3. The assertion is true but the reason is false
4. The assertion is false but the reason is true
5. Both the assertion and reason are true and the reason is the correct explanation of the assertion
6. Both the assertion and reason are true but the reason is not the correct explanation for the assertion
7. The assertion is true but the reason is false
8. The assertion is false but the reason is true

Q. Condensation of chromatin and decondensation of chromosomes occur respectively during

1. prophase and anaphase
2. telophase and prophase
3. telophase and metaphase
4. prophase and telophase

Q. Select the incorrect match regarding mitotic cell division.
(i) Prophase - Chromosomes to begin to uncoil
(ii) Metaphase - Chromatids move apart
(iii) Telophase - The nuclear membrane reappears
(iv) Late anaphase- Each chromosome consists of two anaphase chromatids
(v) Interphase - Chromosomes are not distinct

1. (ii) and (iv) only
2. (i) and (iii) only
3. (ii), (iv) and (v) only
4. (ii) and (v) only

Q.

What is the role of cohesin complexes in species?

Q. What do you mean by unfolding of chromosomes. State the phase in which it occurs

Q. The process of mitosis is divided into 4 phases. Identify the correct order in which these phases appear in mitosis.

1. Anaphase $\to$ Metaphase $\to$ Telophase $\to$ Prophase
2. Telophase $\to$ Anaphase $\to$ Metaphase $\to$ Prophase
3. Prophase $\to$ Metaphase $\to$ Anaphase $\to$ Telophase
4. Metaphase $\to$ Prophase $\to$ Anaphase $\to$ Telophase

Q. During mitosis ER and nucleolus begin to disappear at __________.

1. Early metaphase
2. Late metaphase
3. Early prophase
4. Late prophase

Q.

If a cell with two nuclei is spotted under a microscope, the cell is in ____________ stage of cell division.

Q. Label the parts of the cell in prophase.

1. Nuclear membrane
2. Chromosome
3. Aster

Q. Mention the stages of Mitosis with the help of diagrams. Explain the changes that takes place in Prophase.

Q.

Identify the stage of Mitosis by inspecting the image and key changes listed.

Key changes:

* Nucleolus and nuclear membrane disappears.

* Organelles disappear, formation of chromosomes.

* Centrioles organise to form spindle fibres.

1. Metaphase

2. Anaphase

3. Prophase

4. Interphase

5. Telophase

Q.

The diagram given represents a certain stage of mitosis:

Identify the stage of cell division.