CELL STRUCTURES AND FUNCTION
CELL STRUCTURE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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DNA
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mRNA
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Either A or B
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None of the above
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Detailed explanation-1: -The mRNA leaves the nucleus through nuclear pores and travels to a ribosome.
Detailed explanation-2: -Export is believed to involve the attachment of an adapter protein to the mRNA. The adapter protein binds both the mRNA and a receptor that in turn interacts with pores in the nuclear membrane and thus serves as a shuttle to enable export of mRNA.
Detailed explanation-3: -The passage of mRNAs to the cytoplasm occurs through the nuclear pore complexes (NPCs) that, with their 125 MDa, make the cellular largest protein complex, spanning the double nuclear envelope.
Detailed explanation-4: -For an mRNA to be transported through an NPC, it must be tagged with a nuclear export factor, a type of small protein.
Detailed explanation-5: -After mRNA leaves the nucleus, it moves to a ribosome, which consists of rRNA and proteins. Translation happens on the ribosomes floating in the cytosol, or on the ribosomes attached to the rough endoplasmic reticulum.