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Cells160-page9 - • Duplicates the DNA of the cell prior...

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Cell - 9 Nucleus The nucleus is generally the largest or most "conspicuous" (except for when students are trying to find one) structure within the eukaryotic animal cell. In mature plant cells, the central vacuole, which you usually cannot see, takes much more of the volume. The nucleus is spherical and quite dense. Nucleus Functions Contains and stores the genetic information, DNA, that determines how the cell will function, as well as the basic structure of that cell. (A few organelles: mitochondria and chloroplasts, do have some DNA, but the vast majority of a cell's DNA is contained within the nucleus.) Manufactures all RNA, including ribosomal, transfer and messenger RNA
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Unformatted text preview: • Duplicates the DNA of the cell prior to cell division Nucleus Structure Nuclear Envelope The nucleus is bounded by the nuclear envelope, which is a double membrane • Perforated with pores comprised of RNA and protein that provide channels for exchanging substances with the cytoplasm of the cell. In scanning electron micrographs the surface pores of the nuclear envelope are conspicuous. • Proteins lining the pores determine which molecules can enter and leave the nucleus. • The outer surface of the nuclear envelope is coated with ribosomes (see later)....
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