Cell Biology Exam 2

Aminoacyl tRNA synthetase

Enzymes that attach amino acids to specific transfer RNAs

Phenylalanine

Anticodon 5’-GAA-3’

Cysteine

UGU — first to bind to the A site

7-methylguanosine cap

What eukaryotic ribosomes recognize and initially bind to on mRNA

Termination codon

Where a release factor binds in termination of translation and release of the polypeptide chain

A ribozyme catalyzed reaction

How peptide bonds form in translation

Transcriptionally active DNA

What histone tail acetylation is a sign of

CAP but no cAMP

Lac operon will not transcribe RNA even in the presence of lactose

Lac operon doesn’t turn on

Repressor remains bound to the operator even in the presence of Allolactose

HDAC

Eukaryotic sequence that acts as a repressor

False

Lac repressor binds to DNA when lactose is present in the cell

Transcription via RNA polymerase II

Differential regulation causes distinct characteristics of different cells in a multicellular organism