#Question id: 24212
#Unit 1. Molecules and their Interaction Relevant to Biology
#Question id: 3687
#Unit 3. Fundamental Processes
As the two strands of the double helix are separated, the positive supercoiling interferes with the further unwinding of DNA. Which of the following enzyme makes a break in a strand of DNA to release the supercoiling and facilitate the replication to occur?
#Question id: 9570
#Unit 10. Ecological Principles
#Question id: 14834
#Unit 5. Developmental Biology
#Question id: 11809
#Unit 6. System Physiology – Plant
Shortly after the discovery of kinetin, it was observed that
the differentiation of cultured callus tissue derived from tobacco pith
segments into either roots or shoots depends on the ratio of auxin to cytokinin
in the culture medium. Whereas
a) high auxin:cytokinin ratios stimulated the formation of
roots
b) high auxin:cytokinin ratios stimulated the formation of
shoots
c) low auxin:cytokinin ratios led to the formation of shoots
d) low auxin:cytokinin ratios stimulated the formation of
roots
which of the following combination is correct about the ratio of auxin to cytokinin