In which one of the following combinations (a-b) the number of chromosomes of the present day hexaploid wheat is correctly represented?
Important Questions on Cell : The Unit of Life
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 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 |
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?
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:
| 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 |
Identify the part labelled as ‘’ in the diagram given below:
There are _____ pairs of chromosomes in human beings. [Write the value in digits]
