Q. No.
Cellular structures which disappear during late prophase and reappear during telophase are:
| 1. | Mitochondria and spindle fibres |
| 2. | Plasma membrane |
| 3. | Nuclear membrane and nucleolus |
| 4. | Plastid |
A picture of dividing Drosophila cell through a microscope shows that the cell contains 8 chromosomes, each consisting of two chromatids. The picture must have been taken during:
(1) Mitotic metaphase
(2) Mitotic Anaphase
(3) Meiotic Anaphase II
(4) Meiotic Telophase II
Cytokinesis in animal cell takes place by _______; in _______ direction while in plant cell by _______; in _______ direction:
| 1. | Furrowing, centrifugal, cell plate, centripetal |
| 2. | Furrowing, centripetal, cell plate, Centrifugal |
| 3. | Cell plate, centrifugal, furrowing, centripetal |
| 4. | Cell plate, centripetal, furrowing, centrifugal |
Liquid endosperm in coconut is resulted due to:
| 1. | Karyokinesis followed by cytokinesis |
| 2. | Failure of karyokinesis followed by cytokinesis |
| 3. | Karyokinesis twice followed by single cytokinesis |
| 4. | Karyokinesis is not followed by cytokinesis |
The above graph shows the change in DNA content during various phases (A to (d) in a typical mitotic cell cycle. Identify the phases:
|
|
A |
B |
C |
D |
|
(1) |
G2 |
G1 |
S |
M |
|
(2) |
G |
S |
G2 |
M |
|
(3) |
G1 |
S |
G2 |
M |
|
(4) |
M |
G1 |
S |
G2 |
A reduction step during meiosis is important because:
| 1. | It returns the chromosome number to normal before fertilization |
| 2. | There is a mechanism for this |
| 3. | Only one copy of each chromosome is necessary |
| 4. | Otherwise chromosome copies would double each fertilization |
The DNA content of individual cells and the number of cells in each phase of a "cell cycle" can be determined, using flow cytometry. Which of the following combinations of "phase of a cell cycle and its corresponding DNA content" can be considered normal?
| A. | Diploid cells found in the Go or G1 phase. |
| B. | Cells with twice the normal DNA content in the early M phase. |
| C. | Cells with intermediate amounts of DNA in the S Phase. |
| D. | Cells with twice the normal DNA content in the G2 phase. |
1. A and B
2. B and C
3. C and D
4. All are correct
The following diagram refers to a typical cell cycle.
Identify the parts marked as X, Y and Z.
| 1. | X - G1; Y - S; Z - G2 |
| 2. | X - G2; Y - S; Z - G1 |
| 3. | X - G0; Y - S; Z - G2 |
| 4. | X - G1; Y - G2; Z - G0 |
Identify the meiotic stage in which the homologous chromosomes separate while the sister chromatids remain associated at their centromeres:
(1) Metaphase I
(2) Metaphase II
(3) Anaphase I
(4) Anaphase II
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