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Question

1.)Name 2 structures found inside the nuclear envelope.

Answer 1

The nuclear envelope (also known as the perinuclear envelope, nuclear membrane, nucleolemma or karyotheca) is the double membrane of the nucleus that encloses genetic material in eukaryotic cells. It separates the contents of the nucleus (DNA in particular) from the cytosol. The space between the two membranes that make up the nuclear envelope is called the perinuclear space, and is usually about 20 - 100 nm wide. The outer membrane is continuous with the rough endoplasmic reticulum.

Numerous nuclear pores are present on the nuclear envelope to facilitate and regulate the exchange of materials (for example, proteins and RNA) between the nucleus and the cytoplasm.

The inner membrane is erected upon the nuclear lamina, a network of intermediate filaments made of lamin, that plays a role in mitosis and meiosis. The type of Lamins present are A, B1, B2, and C.

The nuclear envelope may also play a role in the disposition of chromatin inside the nucleus. The lamina acts as a site of attachment for chromosomes. The nuclear envelope also holds DNA and RNA.

Retrieved from "http://en.wikipedia.org/wiki/Nuclear_envelope"

Answer 2

this is plagarized verbatim from Science Line:

The nucleus

The nucleus is the most obvious organelle in a eukaryotic cell. It is usually spherical and about 10 µm across. Virtually all eukaryote cells have a nucleus (red blood cells lose theirs and so are enucleate for most of their life-span of 180 days). It is surrounded by the nuclear envelope, a double membrane with contains a large number of pores. These are about 100 nm across and cover about a seventh of the total surface area of the nuclear envelope. Molecules enter and leave the nucleus by these pores. The two lipid bilayers of the double membrane are separated by a gap of 20 to 40 nm, called the perinuclear space.

The nucleus contains the cell's DNA. This complex molecule carries the information which the cell needs to divide and carry out all its cellular processes. Inside eukaryotic cells, the DNA is associated with histone proteins, and is called chromatin. When the DNA is transcribed into RNA the structure of the chromatin changes to allow the RNA polymerase enyme to access the DNA strand. WHen the cell divides to form new cells, the chromosomes coil up more tightly than usual. The chromosomes are moved to opposite ends of the cell so that, when the cell splits, each daughter cell receives the correct amount of DNA. You can click to find out more about cell division.

Nuclei also have a nucleolius. These darkly-staining, crescent-shaped structures produce ribosomes by producing ribosomal RNA and packaging it with ribosomal proteins. The nucleus and ribosomes work together in the cell to synthesise proteins. You can click to find out more about protein synthesis.

Answer 3

The nuclear envelope (also known as the nuclear membrane or the perinuclear envelope) sheilds the contents of the nucleus from teh contents of the cytoplams. So pretty much anything in the cell other than the nucleus woul dbe your answer: golgi aparatus, rough endoplasmic reticulum, smooth endoplasmic reticulum, secretory vesicles, mitochondria, ribosomes,... The nuclear envelope continues, in structure, with the RER.

Answer 4

DNA/chromatin and RNA/ribosomes/nucleolus

Answer 5

Nucleus & chromosomes?

Answer 6

Nucleolus and nucleaplasam.

Answer 7

RNA and DNA.
nuclear lamina too

Answer 8

Chromosomes and nucleoli.