Homeworks - PP Exam 2

Question 1

What is the correct order for the reactions of assimilation in nitrogen plants?

Answer 1

nitrate -> nitrite -> ammonium -> glutamine -> glutamate

Question 2

What is the main form of nitrogen in the phloem of plants in a nitrogen-rich & light-lacking environment?

Answer 2

asparagine

Question 3

What oxygen concentration can nitrogenase function in?

Answer 3

low oxygen concentration

Question 4

What protein is synthesized in the root cells of a plant infected by Rhizobia?

Answer 4

leghemoglobin

Question 5

“Plants can synthesize all 20 amino acids present in proteins”
True or False?

Answer 5

true

Question 6

In plants, what are aromatic acids synthesized from?

Answer 6

phosphoenolpyruvate

Question 7

What does glyphosate inhibit?

Answer 7

inhibits an enzyme in the shikimate pathway

Question 8

What are nodulation factors produced by?

Answer 8

Rhizobia

Question 9

How are nodulation factors synthesized?

Answer 9

they are synthesized in response to chemical signals secreted by the roots of legumes.

Question 10

What does GOGAT stand for?

Answer 10

“Glutamine Oxoglutarate Aminotransferase”, but it is also known as ‘Glutamate synthase’, because it is involved in synthesizing glutamate from glutamine.

Question 11

Where is GOGAT present?

Answer 11

present in plastids

Question 12

What is GOGAT involved in?

Answer 12

involved in the synthesis of glutamate from glutamine.

Question 13

What does a light-harvesting complex contain?

Answer 13

chlorophyll a, chlorophyll b, carotenoids, and proteins

Question 14

What is the correct order of non-cyclic ETC on the thylakoid membrane?

Answer 14

water -> chlorophyll a in PSII (P680) -> plastoquinone -> cytochrome b6f -> plastocyanin -> chlorophyll b in PSI (P700) -> ferredoxin -> NADP+

Question 15

What is the most DIRECT form of energy for ATP synthesis on thylakoid membrane?

Answer 15

pH gradient on thylakoid membrane (the sun is the main form but DIRECT is the pH gradient, it is ON the thylakoid membrane)

Question 16

How many photosystems fo purple photosynthetic bacteria have?

Answer 16

one, and it’s similar to PSII

Question 17

How many CO2 (carbon dioxide) molecules need to be fixed in the Calvin cycle to make a sucrose molecule?

Answer 17

12, (4 triosphosphates x 3 carbons each)

Question 18

Why is photorespiration considered a wasteful process?

Answer 18

it doesn’t fix carbon dioxide and it consumes ATP

Question 19

When are C3 plants more efficient than C4 plants?

Answer 19

in high concentration of carbon dioxide in the atmosphere

Question 20

What type of plant reaches photosynthetic saturation at lower light intensity?

Answer 20

C3

Question 21

What is the light compensation point?

Answer 21

when the amount of carbon dioxide fixed by plant equals the amount of carbon dioxide produced through respiration, 0 on the x-axis

Question 22

Where is sucrose synthesized?

Answer 22

the cytosol/cytoplasm

Question 23

Can sucrose be synthesized at night?

Answer 23

YES, from hexose-P by starch degradation

Question 24

What is starch made of?

Answer 24

glucose molecules

Question 25

Where is starch synthesized?

Answer 25

the chloroplast/plastids

Question 26

Which of the following is not stored in the vacuole (malate, sucrose, starch, fructans)?

Answer 26

starch (stored in plastids)

Question 27

Are phloem sieve elements live cells? What is different about them?

Answer 27

YES, they are modified to lack a lot of common organelles