Pyranose rings are usually most stable when the ring adopts a ________ conformation with the bulkiest ring substituents in ________ positions.

#Question id: 19803

#Unit 12. Applied Biology

#Question id: 7545

#General Aptitude

#Question id: 7251

#Unit 5. Developmental Biology

Following statements are regarding to the three “toggle switches” activated along the anterior-posterior axis to establish gap gene domains in drosophila.

A. The mutual inhibition of Knirps and Hunchback positions the Knirps protein domain at around 60–80% along the anterior-posterior axis.

B. Hunchback inhibits Krüppel expression at high concentrations but promotes it at intermediate concentrations.

C. Hunchback inhibits Krüppel expression at intermediate concentrations but promotes it at high concentrations.

D. Krüppel and Giant mutually inhibit each other’s synthesis.

E. Kruppel inhibits Giant expression at high concentrations but promotes it at intermediate concentrations.

Which of the following statements are correct?

#Question id: 974

#Unit 1. Molecules and their Interaction Relevant to Biology

What is the source of the N-1 atom during de novo biosynthesis of purines?

#Question id: 28315

#Unit 5. Developmental Biology

Which of the following protein that digests zona and responsible for digesting a pathway to the oocyte?