Centromeres associated cohesins are specifically protected by protein phosphatase 2A (PP2A). Protein phosphatase 2A (PP2A) is recruited to centromeric regions in human cells from G2 through metaphase by a member of a family of PP2A targeting factors known as: 

#Question id: 10914

#Unit 6. System Physiology – Plant

Early research on phloem loading focused on the apoplastic pathway, probably because it is very common in

#Question id: 10915

#Unit 6. System Physiology – Plant

Pathways for phloem unloading and short distance transport. The sieve element–companion cell complex (SE–CC) is considered a single functional unit. The presence of plasmodesmata is assumed to provide functional_______Y_______.  An absence of plasmodesmata between cells indicates an______Z________.

#Question id: 10916

#Unit 6. System Physiology – Plant

A photosynthetic sugar sucrose can be hydrolyzed into glucose and fructose in the apoplast by a sucrose-splitting enzyme, this enzyme known as;

#Question id: 10917

#Unit 6. System Physiology – Plant

Photosynthetic sugar molecules are transported via phloem to other parts of the plants. The following aspects are associated with sucrose unloading in phloem and its transport;

a) The presence of plasmodesmata is assumed to provide apoplastic transport. An absence of plasmodesmata between cells indicates an nonfunctional symplastic continuity

b) Phloem unloading and short-distance transport can occur via symplastic as well as apoplastic pathways

c) Both unloading and the short-distance pathway appear to be completely symplastic in some young eudicot leaves, such as sugar beet and tobacco

d) An apoplastic step is required in developing seeds because there are no symplastic connections between the maternal tissues and the tissues of the embryo

Which of the following combination is INCORRECT?

#Question id: 10918

#Unit 6. System Physiology – Plant

The import into sinks such as developing roots, tubers, and reproductive structures, In many ways the events in sink tissues are simply the reverse of the events in sources. The following steps are involved in the import of sugars into sink cells such as;

#Question id: 10919

#Unit 6. System Physiology – Plant

Both of these observations—________X__________and________Y__________—support the existence of mass flow in the sieve elements of the phloem.