Which of the following  of the cleavage enzymes of rRNAs and tRNA is a ribozyme?

#Question id: 27980

#Unit 1. Molecules and their Interaction Relevant to Biology

#Question id: 2855

#Unit 2. Cellular Organization

Which statements are correct about lac operator;

I. The site bound by the Lac repressor.

II. The lac operator overlaps the promoter, and so the repressor bound to the operator physically prevents RNA polymerase from binding to the promoter and thus inhibit the RNA synthesis.

III. Have 21-bp sequence with twofold symmetric and is recognized by four subunits of Lac repressor, two binding to each half-site.

IV. CAP binds as a dimer to a site similar in length to that of the lac operator, but different in sequence. This site is located some 60 bp upstream of the start site of transcription.

#Question id: 3867

#Unit 3. Fundamental Processes

RNA polymerase from E. coli (core enzyme alone) has all of the following properties except that it:

#Question id: 10951

#Unit 7. System Physiology – Animal

Which blood type is depicted in the following figure?

#Question id: 12068

#Unit 7. System Physiology – Animal