USMLE Forums banner

1 - 4 of 4 Posts

·
Registered
Joined
·
4,342 Posts
Discussion Starter · #1 ·
The molecular basis behind the presence of far more proteins than there are respective genes is explained by which of the following in humans --- bacteria respectively?

A- mRNA both side reading --- Polycistronic mRNA
B- DNA template and coding strands transcription --- Alternative splicing
C- Alternative splicing --- Polycistronic mRNA
D- Redundancy --- Degenerate code
E- Gene variation --- Posttranslational modification
 

·
Registered
Joined
·
234 Posts
the ans is C. human eukaryotic mRNA undergo alternative splicing which allows diff proteins to be expressed by the same gene eg:diff dopamine receptors (so all eukaryotes mRNA are monocistronic). in contrast prokaryotics are both monocistronic and polycistronic.
 

·
Registered
Joined
·
20 Posts
option C

alternative splicing in humans can create several proteins from a single gene.

polycistronic mRNA in bacteria: 1 gene-->1 mRNA--> several proteins coded

:D
 
1 - 4 of 4 Posts
Top