NEETBotanyCell - The Unit of Life
Which of the following statements correctly distinguishes the double-membrane envelope of the nucleus from that of the chloroplast?
Options
- ABoth the nuclear envelope and chloroplast membranes are continuous throughout and lack any pores.
- BThe inner membrane of the nucleus is folded into cristae to increase surface area, unlike the chloroplast.
- CThe two membranes of the nuclear envelope fuse at several places to form pores, whereas the chloroplast envelo
- DThe outer membrane of the chloroplast is continuous with the endoplasmic reticulum and bears ribosomes on it.
Correct answer
C. The two membranes of the nuclear envelope fuse at several places to form pores, whereas the chloroplast envelo
Step-by-step solution
The nuclear envelope consists of two parallel membranes that are interrupted at several places by minute pores. These nuclear pores are formed by the fusion of its two membranes. In contrast, the chloroplast envelope consists of outer and inner membranes that do not fuse to form such pores. Option 1 is incorrect because the nuclear envelope has pores. Option 2 is incorrect because cristae are infoldings of the inner mitochondrial membrane, not the nuclear membrane. Option 4 is incorrect because it is the outer memb