Question 1
Heterochromatin formation in fission yeast involves production of double-stranded RNA by:
◦ sense-antisense RNA pairing.
◦ Drosha cleavage of paired RNA molecules.
◦ an RNA-dependent RNA polymerase.
◦ a DNA-dependent RNA polymerase.
◦ complex RNA secondary folding.
Question 2
Hfq is produced by E. coli and functions:
◦ as an RNA-binding protein to bind many transcripts in the cell to alter translation levels of stress-response proteins.
◦ as an RNA-binding protein to bind many small RNAs, including
oxyS RNA, to enhance its ability to bind to target mRNAs.
◦ as an RNA in RNA-RNA interactions to modulate the activity of Dicer in the RNAi pathway.
◦ as an RNA in RNA-RNA interactions to modulate the function of riboswitches.
◦ as an antisense RNA to target degradation of specific transcripts.
Single E. coli bacterium
Functions of antibodies
The cell wall of a Gram-negative bacterium, E. coli
Cell parts and their functions
Opener Transmission electron micrograph of conjugating Escherichia coli