Page 34 - 11-Bio-4 The Cell

4. The Cell eLearn.Punjab

Exercise

Q.1. Fill in the blanks:

(i) In eukaryotic cell chromatin material is bounded b y --------------
(ii) A group of ribosomes attached to mRNA is known as —------------
(iii) -------------- is the place on chromosomes where spindle fibres are attached

during cell division.
(iv) The endoplasmic reticulum with attached ribosomes is known as ------------
(v) The soluble part of the cytoplasm is called.

Q.2. Write whether the statement is ‘true’ or ‘false’ and write the correct statement if it
is false.

(i) Cell membrane is present in all eukaryotic cells.
(ii) Chloroplast and mitochondria do not have hereditary material.
(iii) Centriole is involved in cell secretions.
(iv) Sometimes many ribosomes get attached to the same stretch of mRNA forming a

structure called the cytosome.
(v) Mitochondria are very important organelles of the eukaryotic cells.

Q.3. Short Questions.

i. Describe various movements involved in the transport of materials across the cell
membrane.

ii. State various structural modifications in a cell involved in secretions.
iii. List the processes blocked by mitochondrial failure in a cell.
iv. What will happen if a chromosome loses its centromere?
V. How does autophagy help in converting a tadpole larva into an adult amphibian?
vi. Is there any similarity between bacterial and plant cell wall?

34 V: 1.1