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प्रश्न
What are nuclear pores?
उत्तर
The nuclear envelope bounds the nucleus from the outside and separates it from the cytoplasm. It consists of two membranes, the outer membrane continuous with the endoplasmic reticulum. The nuclear envelope is interrupted by minute nuclear pores at several places, which are produced by the fusion of its two membranes.
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संबंधित प्रश्न
What is a centromere?
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.
In a cell that is not dividing, the chromosomes are visible as a tangle of fine threads called
Chromosome having centromere in its middle is
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.
A common characteristic feature of plant sieve tube cells and most of mammalian erythrocytes is ______.
What is the feature of a metacentric chromosome?
Discuss briefly the role of nucleolus in the cells actively involved in protein synthesis.
What are histones? What are their functions?
Write the function of the following:
Centromere
Explain the functions of the nuclear pores.
