If you analyzed the phloem sap of a plant and found high concentrations of _____

Question

If you analyzed the phloem sap of a plant and found high concentrations of ________________, the plant most likely phloem loads through the symplasm

sucrose

starch

raffinose family oligosaccharides

sugar alcohols (polyols)

glucose

If I had a compound that specifically inhibited the activity of plasma membrane ATPases, and if I observed that this compound resulted in an immediate cessation of phloem transport when applied to a plant, what type phloem loading is most likely being employed?

Apoplasmic phloem loading

Symplasmic phloem loading

Phloem loading by transpiration

Phloem loading by osmosis

Passive phloem loading

In plastids, the anabolic reactions of the Calvin Cycle (sometimes, albeit rarely, referred to as the reductive pentose phosphate pathway) need to be kept separate from the catabolic reactions of the oxidative pentose phosphate pathway (OPPP). How is this achieved?

Disulfide bridges on enzymes in the Calvin Cycle need to be oxidized

Disulfide bridges on enzymes in the OPPP need to be oxidized

Calvin Cycle enzymes are in the stroma; OPPP enzymes are in the thylakoid lumen

Calvin Cycle enzymes are in the thylakoid lumen; OPPP enzymes are in the stroma

Both reactions are controlled by substrate and product concentrations favoring either the ‘forward’ (anabolic) or ‘reverse’ (catalytic) reactions

Which of the following DO NOT promote stomatal opening in plants that do not use CAM metabolism (choose all that are correct)

Increased levels of the plant hormone ABA (abscisic acid)

Blue light

Red light

Low levels of CO2

Darkness

Drought

Explanation / Answer

Answer 1 d) If you analyzed the phloem sap of a plant and found high concentrations of ____glucose____, the plant most likely phloem loads through the symplasm.

Reason - Symplasm is a way to where low molecular wt. solutes are able to freely pass through plasmodesmata. such molecules are ions, sugars and amino acids.

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