In both photosystem I and photosystem II, light energy is used to excite electrons. The two photosysterns were narmed in the order of their discovery, and not the order of their work in the light-dependent reactions. Photosystem Il comes first in the sequence of events that moves
electrons from water molecules to their destination, NADP. Hydrogen ions travel with the electrons, and they change NADP into NADPH. The
process is summarized in this diagram.
The concentration of hydrogen ions is greater inside the thylakoid than outside. Which reaction or set of reactions releases hydrogen ions
inside the thylakoid?
2*+2(NADP)+ d0>NADPH
To Light-
Independenm
w
Light
Light
Resctic
STROMA
OH
H
Ht
H*
Thy akoid
mernbrane
ATP
Electron caien
hase
To Light
Independent
systern
K Reactions
ptosyster
OH
o
OH
2H, O
THYLAKOID SPACE
4H

Question 17 (1 point) where does penicillin come from? a. it is a chemical that man invented b. it is a fungus c. it is a toxin made by other bacteria d. it was discovered in archaebacteria

Which of the following is not a technology that can be used to conserve resources? a. hydropower b. volcanic power c. natural gas d. geothermal select the best answer from the choices provided a b c d

On a backpacking trip, kenny hikes all day at a steady pace, covering 30 kilometers and burning 4000 calories. at the school track, janelle runs the 100-meter sprint in 13.5 seconds, burning 10 calories. afterward, janelle’s leg muscles are aching and she is breathing hard, while kenny maintains normal breathing all day, even though he burns 400 times more calories than janelle. which two statements offer the best explanation for this phenomenon? a. if the aerobic pathway—cellular respiration—cannot meet the energy demand, then the anaerobic pathway—lactic acid fermentation—starts up, resulting in lactic acid buildup and "oxygen debt." b. aerobic cellular respiration produces more energy, but its use is limited because of lactic acid buildup in the muscles and the resulting "oxygen debt." c. after about 90 seconds of intense exercise, the muscles become depleted of oxygen, and anaerobic respiration can no longer function to produce atp, resulting in "oxygen debt." d. the rate of energy demand determines how the muscles will obtain energy, either from cellular respiration or from lactic acid fermentation if not enough oxygen is present.