There are two broad categories of receptors that activate tyrosine kinases: (1) those in which the tyrosine kinase enzyme is an intrinsic part of the receptor’s polypeptide chain, called the_________ and (2) those, in which the receptor and kinase are separate polypeptides, encoded by different genes, yet are bound tightly together, called the __________.

#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: 19071

#Unit 6. System Physiology – Plant

#Question id: 518

#Unit 1. Molecules and their Interaction Relevant to Biology

Transfer of the phosphoryl group from PEP to ADP is an example of

#Question id: 10314

#Unit 6. System Physiology – Plant

How many redox reaction and decarboxylation reaction participate in Kreb’s cycle?

#Question id: 6999

#Unit 5. Developmental Biology

The developmental precursors to the gonadal tissues of Caenorhabditis elegans uniquely contain ________.