#Question id: 15143
#SCPH01 Biochemistry
#Question id: 4945
#SCPH28 | Zoology
Which is a defining characteristic that all protobionts had in common?
#Question id: 1091
#SCPH06 I Botany
Why does testosterone, a lipid-soluble signaling molecule that crosses the membranes of all cells, affect only target cells?
#Question id: 4596
#SCPH28 | Zoology
In a hypothetical environment, fishes called pike-cichlids are visual predators of large, adult algae-eating fish (in other words, they locate their prey by sight). The population of algae-eaters experiences predatory pressure from pike-cichlids. Which of the following is least likely to result in the algae-eater population in future generations?
#Question id: 10906
#SCPH05 I Biotechnology
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.