2.1 Prophase

Question 1

______ is the longest phase in mitosis.

Answer 1

Prophase

Question 2

Topic - Start of Prophase

Answer 2

I. Marked by
II. Chromatin condensation
III. Nucleolar Organizer

Question 3

Prophase is marked by:

Answer 3

Initiation of condensation of chromosomal material

Question 4

What is chromatin condensation?

Answer 4

Chromosomal material (tangled chromatin fibers) become untangled and condenses to chromosomes.

Question 5

At the start of Prophase, ______ is attached to the chromosome at the nucleolar organizer.

Answer 5

nucleolus

Question 6

Topic - Completion of Prophase

Answer 6

I. Condenses to form
II. Split into
III. Towards which pole
IV. In animals,
V. Radiate out
VI. Which protein, apparatus
VII. At end, organelle don’t show

Question 7

Chromosomal material condenses to form a compact ______.

Answer 7

mitotic chromosomes

Question 8

Each chromosome splits into two chromatids attached together at ______.

Answer 8

Centromere

Question 9

The ______ that duplicate during the S phase of interphase now begins to move towards opposite poles of the cell in the ____ phase.

Answer 9

Centrosome; Prophase

Question 10

In animal cells, the centriole moves to opposite poles.
T/F

Answer 10

True

Question 11

Each centrosome radiates out ______.

Answer 11

Astral rays (Microtubular fibrils)

Question 12

Astral rays, along with its _____ pair, are called _____.

Answer 12

centriole pair; Aster

Question 13

2 asters move to ______ (same/opposite) pole and start ______ formation.

Answer 13

opposite; Spindle formation

Question 14

Spindle fibers originate from ______ proteins.

Answer 14

Microtubular proteins (tubulin)

Question 15

The two asters, together with spindle fibers, form ______ apparatus.

Answer 15

Mitotic apparatus

Question 16

When viewed under the microscope at the end of prophase.
Cells do not show ______.

Answer 16

I. Golgi complexes
II. Endoplasmic reticulum
III. Nucleolus
IV. Nuclear envelope