
Giant chromosomes were discovered by E. Balbiani with having thousands of DNA strands called chromosomal puffs. These puffs are
Balbiani rings

Important Questions on Molecular Basis of inheritance


Mitochondria and chloroplast are:
(i) Semi - autonomous organelles
(ii) Formed by the division of pre-existing organelles and they contain DNA but lack protein synthesizing machinery
Which one of the following option is correct?


Fill up the blanks with suitable words, respectively.
Each chromosome has a ____ or _____ on the sides, disc shaped structure is called _____. The _____ chromosome has two equal arms, ____ chromosome has one shorter and one long arm. _____ chromosome has no second arm. The secondary constriction develop small fragment called ______
A) metacentric
B) telocentric
C) centromere
D) primary constriction
E) submetacentric
F) satellite
G) kinetochore




Match List - I with the List - II.
List - I | List - II | ||
(a) | Metacentric chromosome | (i) | Centromere situated close to the end forming one extremely short and one very long arms |
(b) | Acrocentric chromosome | (ii) | Centromere at the terminal end |
(c) | Sub-metacentric | (iii) | Centromere in the middle forming two equal arms of chromosomes |
(d) | Telocentric chromosomes | (iv) | Centromere slightly away from the middle forming one shorter arm and one longer arm |
Choose the correct answer from the options given below:

Match the following?
Chromosomes | Centromere | Chromatids | |||
(a) | Metacentric | (i) | Nearer to one end | (p) | Extremely short and long |
(b) | Telocentric | (ii) | Middle | (q) | One arm |
(c) | Submetacentric | (iii) | Close to its end | (r) | Two equal arms |
(d) | Acrocentric | (iv) | Terminal | (s) | One short one long |


Identify the part labelled as ‘’ in the diagram given below:



Column I | Column II | ||
A | Thylakoids | (i) | Disc-shaped sacs in Golgi apparatus |
B | Cristae | (ii) | Condensed structure of DNA |
C | Cisternae | (iii) | Flat membranous sacs in stroma |
D | Chromatin | (iv) | Infoldings in mitochondria |






