Chapter 16, Problem 63P

Interpretation Introduction

Interpretation:

The entity to which mRNA binds after leaving the nucleus should be determined.

Concept Introduction:

Three types of RNAs are synthesised in the transcription process, each performing one type of function in protein biosynthesis. One RNA acts as messenger or informational RNA; this is mRNA. The second type of RNA is the transfer RNA, tRNA and the third type of RNA is the ribosomal RNA i.e. rRNA. The base composition of different mRNAs and different tRNAs vary, rRNAs show little bit variation. The variations are possible because RNA molecules are very much smaller than the DNA molecules and so a number of RNAs can be synthesised from a DNA, each particular RNA being synthesised on a specified part of DNA molecule.

Correct answer:

Option (d), m-RNA leaves the nucleus and binds to a ribosome.