#Question id: 870
#Unit 1. Molecules and their Interaction Relevant to Biology
Choose correct statements about ‘Protein Disulfide Isomerase’ in protein folding
A. Oxidized PDI catalyzes the rearrangement of a polypeptide’s non-native disulfide bonds via disulfide interchange reactions to yield native disulfide bonds.
B. Reduced PDI catalyzes the initial formation of a polypeptide’s disulfide bonds through the formation of a mixed disulfide.
C. Protein disulfide isomerase contains the conserved active site motif of Cys-Xaa-Xaa-Cys found in thioredoxin and shares a similar role to the Dsb family of proteins found in E. coli.
D. Under more reducing conditions with thiols in the active site the enzyme reshuffles disulfides (isomerase) in target proteins.
#Question id: 5379
#General Aptitude
The average weight of three brothers is 68 kg . If their weights are in the ratio 3:4:5, the weight of the heaviest of the three brothers is.
#Question id: 4643
#Unit 11. Evolution and Behavior
The treeʹs horizontal axis is a timeline that extends from 100,000 years ago to the present; the vertical axis represents nothing in particular. The labeled branch points on the tree (V—Z) represent various common ancestors. Letʹs say that only since 50,000 years ago has there been enough variation between the lineages depicted here to separate them into distinct species, and only the tips of the lineages on this tree represent distinct species.
How many separate species, both extant and extinct, are depicted in this tree?
#Question id: 5752
#Unit 8. Inheritance Biology
#Question id: 23784
#Unit 7. System Physiology – Animal