3. which of the following would not prevent an mrna from being transported to the rough endoplasmic
reticulum in the cytoplasm?

the ends of the mrna were not modified.
the mrna was not correctly spliced
the mrna was not bound by a ribosome.
the mrna is for a secreted protein.

4.which of the following pairings is correct?
rrna: protein template
trna: anticodon matching
mrna: creates peptide bonds
ribosome: makes amino acids

5. what type of mutation could cause the 3-nucleotide reading frame of trna to be shifted?

switching a normal nucleotide for an abnormal one
deletion of one or more nucleotides during replication
replacing an amino group
incorrect base pairing

3 The mRNA was not bound to by a ribosome  4 tRNA: anticodon matching  5 switching from normal nucleotide for an abnormal one .

Explanation:

3  If the mRNA is not bound to the ribosome then this do not prevent the mRNA from being transported to the Endplasmic reticulum in the cytoplasm.This because binding of ribosome to the mRNA is essential after the mRNA has reached the cytoplasm to initiate the process of protein synthesis.

4 tRNA contains Anticodons that interact with the codon present in the mRNA to bring an amino acid specific for that codon to the A site of ribosome.

5 Mutation at the 3" nucleotide reading frame switch a normal nucleotide for an abnormal one.      

a- all cells come from pre-existing cells