#Question id: 7483
#General Aptitude
#Question id: 672
#Unit 1. Molecules and their Interaction Relevant to Biology
An ideal α-helix has a pitch of 0.54 nm and a rise of 0.15 nm. What is the length along the helix axis for a segment of an ideal α-helix that contains 30 amino acids?
#Question id: 5575
#Unit 5. Developmental Biology
Which of the following is the correct sequence of the zones in the primary growth of a root, moving from the root cap inward?
#Question id: 13196
#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.