Biol 3490, Midterm II, March 26, 2024

Which of the following regulates rubisco activity?

• Stroma pH

• Stroma Mg2+ concentration

• CO2

• All of the above

• None of the above

Which of the following crops is not a C4 plant?

• Corn

• Soybean

• Sugarcane

• Switchgrass

Answer explanation

Soybean is a C3

Which of the following is the main translocated sugar in phloem?

• Amylose

• Fructose

• Ribose

• Sucrose

• Starch

Which protein coats and protects the T-DNA?

• Vir A

• Vir B

• Vir C

• Vir D2

• Vir E2

Answer explanation

Vir B - makes a channel for t-DNA to attach

For the wood you buy from a Lowe’s store, the majority of the structure is?

• Secondary phloem

• Primary phloem

• Secondary xylem

• Primary xylem

Which protein is covalently attached at 5’ end of the T-DNA after the T-DNA is cut?

• Vir A2

• Vir B2

• Vir C2

• Vir D2

• Vir E2

Answer explanation

Vir D2, Vir E2 ---> only ones with 2 after

Vir D2 - inserts itself into DNA, attaches 5'

Vir E2 - adds a protective coating

Which of the following is a “sink” in the situation of sugar translocation?

• Developing fruits

• Immature leaves.

• Roots.

• Seeds.

• All of the above

Answer explanation

Sugar moves from source to sink

Which of the following is a “source” in the situation of sugar translocation?

• Developing fruits

• Immature leaves.

• Roots.

• Seeds.

• Mature leaves

Answer explanation

Structures capable of their own photosynthesis,

sugar moves from source ---> sink

Which of the following plants have the lowest CO2 compensation point?

• C2

• C3

• C4

• C5

• CAM

Answer explanation

C4 plants start at 0 CO2 compensation point, while C3 plants start at 10

measured in intercellular CO2 partial pressure

Which of the following plants have the highest CO2 compensation point?

• C2

• C3

• C4

• C5

• CAM

Answer explanation

C4 plants start at 0 CO2 compensation point, while C3 plants start at 10

measured in intercellular CO2 partial pressure