#Question id: 18079
#Unit 9. Diversity of Life Forms
#Question id: 10166
#Unit 6. System Physiology – Plant
plants such as maize whose vascular tissues are surrounded by two distinctive photosynthetic cell types In this anatomical context, the transport of CO2 from the external atmosphere to the bundle sheath cells proceeds through five successive stages such as;
a.) Fixation of the HCO3 − in phosphoenolpyruvate by PEP Case in the bundle sheath cells
b.) Transport of the four-carbon acids (malate or aspartate) to mesophyll cells that surround the vascular bundles
c.) Decarboxylation of the four-carbon acids and generation of CO2 which is then reduced to carbohydrate via the Calvin–Benson cycle
d.) Transport of the three-carbon backbone (pyruvate or alanine) formed by the decarboxylation step back to the mesophyll cells
e.) Regeneration of phosphoenolpyruvate, the HCO3 – acceptor
Which of the following stages are FALSE?
#Question id: 34142
#Unit 7. System Physiology – Animal
#Question id: 18593
#Unit 11. Evolution and Behavior
#Question id: 4541
#Unit 3. Fundamental Processes
Mig1 recruits a “repressing complex” containing the Tup1 protein. This complex is recruited by many yeast DNA-binding proteins that repress transcription, including the alpha2 protein involved in controlling the mating-type specific. Tup1 also has counterparts in mammalian cells, choose correct mechanisms have been proposed to explain the repressing effect of Tup1.
I-Tup1 acts on nucleosomes either through recruiting histone deacetylases and/or by positioning a nucleosome at or near the transcription start site.
II-Tup1 interacts directly with the transcriptional machinery at the promoter and inhibits initiation.