#Question id: 10906
#Unit 6. System Physiology – Plant
The pressure-flow model explains phloem translocation as a flow of solution (bulk flow) driven by an osmotically generated pressure gradient between source and sink.
a) Phloem translocation, both active and passive mechanisms were considered. All theories, both active and passive, assume an energy requirement in both sources and sinks.
b) In sources, energy is necessary to move photosynthate from producing cells into the sieve elements. This movement of photosynthate is called phloem loading.
c) In sinks, energy is essential for some aspects of movement from sieve elements to sink cells, which store or metabolize the sugar. This movement of photosynthate from sieve elements to sink cells is called phloem unloading.
d) The Active mechanisms of phloem transport further assume that energy is required in the sieve elements of the path between sources and sinks simply to maintain structures.
From the given statements find out the correct for pressure-flow model.
#Question id: 7496
#General Aptitude
#Question id: 32400
#Unit 1. Molecules and their Interaction Relevant to Biology
#Question id: 4546
#Unit 3. Fundamental Processes
In eukaryotes, transcriptional regulators are not typically controlled at the level of DNA binding (although there are exceptions). Regulators are instead usually controlled in one of the following two basic ways.
I. Unmasking an Activating Region
II. Transport into and out of the Nucleus
III. Mediated through proteolysis of an inhibitor or tethering region or by allosteric changes.
IV. Also is itself (or recruits) a deacetylase,
#Question id: 950
#Unit 1. Molecules and their Interaction Relevant to Biology
Nitric oxide is formed from arginine. It is a messenger molecule with several functions that include all below except