1. Which one of the following statements about RNAprocessing is true?

RNA splicing can be catalyzed by tRNA

Introns are cut out before mRNA leaves from the nucleus

RNA polymerase removes exons from the pre-mRNA

A pre-mRNA is often much shorter than the final mRNA moleculethat leaves from the nucleus

2. Which of the following is an explanation for howthere can be differential gene expression throughout amulticellular organism?

Some tissues have histones, while other cells do not usehistones

There are unique sets of genes present in the different tissuesof the organisms

Different tissues throughout the organism use different geneticcoding rules

There are unique combinations of transcription factors indifferent tissues of the organism

3. Where, in a eukaryotic cell, shouldfunctional tRNA molecules be located?

RNA polymerase

Nucleolus

Nucleus

Cytoplasm