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प्रश्न
A common characteristic feature of plant sieve tube cells and most of mammalian erythrocytes is ______.
विकल्प
Absence of mitochondria
Presence of cell wall
Presence of haemoglobin
Absence of nucleus
उत्तर
A common characteristic feature of plant sieve tube cells and most of mammalian erythrocytes is absence of nucleus.
Explanation:
A common characteristic feature of plant sieve tube cells and most mammalian erythrocytes is absence of a nucleus as due to absence of a nucleus gives erythrocytes more space for binding more Hb. On the other side lack of cell organelles in the sieve tube provide extra space to accommodate more water and ensure fast transportation.
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संबंधित प्रश्न
What are nuclear pores?
Describe the structure of the following with the help of labelled diagram.
Nucleus
How does the position of centromere form the basis of classification of chromosomes. Support your answer with a diagram showing the position of centromere on different types of chromosomes.
When the centromere is situated in the middle of two equal arms of chromosomes, the chromosome is referred to as ______
Match List - I with List - II.
| List - I | List - II | ||
| (a) | Cristae | (i) | Primary constriction in chromosome |
| (b) | Thylakoids | (ii) | Disc-shaped sacs in Golgi apparatus |
| (c) | Centromere | (iii) | Infoldings in mitochondria |
| (d) | Cisternae | (iv) | Flattened membranous sacs in the stroma of plastids |
Choose the correct answer from the options given below.
What is the feature of a metacentric chromosome?
What is refer-ed to as satellite chromosome?
Discuss briefly the role of nucleolus in the cells actively involved in protein synthesis.
Write the function of the following:
Centromere
Explain the functions of the nuclear pores.
