In eukaryotic cells, the term "nuclear envelope" is more correct than the term "nuclear membrane" for the enclosure around nucleus because:
1. the enclosure has pores which membranes do not
2. the enclosure is made up of two membranes
3. the chemical composition is inconsistent with cellular membranes
4. the enclosure does not enclose the nucleolus
Subtopic:  Nucleus |
From NCERT
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Which number represents the site of ribosome biogenesis in the given figure?
1. 1 2. 2
3. 3 4. 4
Subtopic:  Nucleus |
 66%
From NCERT
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A common characteristic feature of plant sieve tube cells and most of mammalian erythrocytes is
1. Absence of mitochondria
2. Presence of cell wall
3. Presence of haemoglobin
4. Absence of nucleus

Subtopic:  Nucleus |
 90%
From NCERT
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