Section 7.4 Cell Systems I: Nuclear Transport

Structure of the Nuclear Envelope

nuclear pore complexes

Function of the Nuclear Envelope

Connects inside of nucleus with the cytosol

what is needed in the nucleus is made in the cytoplasm and imported into the nucleus

Proteins

what is used for copying DNA or synthesizing RNA

Proteins

Proteins are also for …

ribosomes

what also enters the Nuclear Envelope

Nucleotides

what are Nucleotides used for

building DNA and RNA

How Do Molecules Enter the Nucleus

Nuclear proteins contain a 17-amino-acid-long nuclear localization signal (NLS)

nuclear localization signal (NLS) serves as a

“zip code” that Marks molecules them for transport through nuclear pore complex

What goes in the nucleus

Products made in the cytoplasm and imported into the nucleus

What goes out the nucleus

Products synthesized in the nucleus and exported to the cytoplasm

why do proteins go into the nucleus

for copying DNA or synthesizing RNA, for ribosomes, and Nucleotides for building DNA and RNA

what RNA goes out of the nucleus

Ribosomal RNA and Messenger RNA (mRNA)

Messenger RNA (mRNA)

carries information to synthesize proteins

Ribosomal RNA

binds proteins to form ribosomes