SAT 2 Photosynthesis

(C) Green Explanation:

(A) Red (B) Blue (C) Green (D) Yellow (E) Violet

(D) NADPH Explanation: NADPH is a molecule that ferries hydrogen from the light reactions occurring in the grana to the Calvin cycle, which occurs in the stroma

A molecule that carries H2 from the light-dependent reactions to the Calvin cycle

(C) PGAL Explanation: PGAL stands for phosphoglyceraldehyde

A sugar sythesized during photosythesis

(A) it occurs during the light independent reactions Explanation: Photolyses is the splitting apart of water molecules into their components: oxygen and hydrogen. It occurs during the light dependent reactions, not during the light independent reactions. Electrons in chlorophyll a become excited when they absorb light energy and jump to electron transport chain in the thylakoid Membrane. Water provides two things: electrons to replace those lost by chlorophyll a and protons for production of sugar. In addition, oxygen is released into the environment.

All of the following statements about photolysis are correct EXCEPT (A) it occurs during the light independent reactions (B) it releases oxygen (C) it provides hydrogen for carbon fixation (D) it supplies electrons to chlorophyll a (E) it is the process of splitting apart molecules of water

(C) The light independent reactions normally occur at night in most plants Explanation: The light independent reactions do not require light. However, they require the products of the light dependent reactions, ATP and hydrogen from NADPH. The light dependent reactions occur in the grana, which consist of thylakoid membrane's. The process of water breaking apart, called photolysis, provides electrons and protons for photosynthesis.

All of the following statements are correct about photosynthesis EXCEPT (A) water provides hydrogen for carbon fixation (B) The light independent reactions occur in the stroma (C) The light independent reactions normally occur at night in most plants (D) The light dependent reactions occur in the thylakoids membranes (E) the thylakoid membrane's are part of the grana

(D) PG AL, a 3-carbon sugar, is produced Explanation: Glyceraldehyde- 3- phosphate (G3P), a 3- carbon sugar, is the product of the Calvin cycle, light independent reactions, not the light dependent reactions. The light dependent reactions take place in the thylakoid membrane's of the grana within the chloroplast. Chlorophyll B and carotenoids are antennae or accessory pigments.

All of the following statements are correct about the light dependent reactions of photosynthesis EXCEPT (A) Carotenoids are accessory pigments (B) they take place in the grana (C) when light strikes chlorophyll a, electrons enter an electron transport chain (D) PGAL, a three carbon sugar, is produced (E) they take place within the thylakoid Membranes

(B) Protons Explanation: the potential Energy stored in a proton gradient is converted into ATP is protons flow through ATP synthetase channels

Pass through ATP synthetase channels

(E) ATP Explanation: ATP is produced during the light reactions and is used to produce sugar during the Calvin cycle of the light-independent reactions.

Provides the energy for the light- independant reactions

(A) Oxygen Explanation: Oxygen is released as a waste product of Photosynthesis. It comes from the photolysis of water.

Released as a waste product from the light-dependant reactions

(A) comes from the light dependent reactions of photosynthesis Explanation: when light strikes chlorophyll A, electrons become excited and escape from chlorophyll a. Replacement electrons are supplied by electrons from the water, not from carbon dioxide. The product of the Calvin cycle is sugar. Carbon dioxide is a byproduct of respiration in both plants and animals. NADP carries hydrogen, not oxygen, from the light reactions to the Calvin cycle (light independent reactions).

The oxygen the plants give off (A) comes from the light dependent reactions of photosynthesis (B) comes from the light independent reaction of photosynthesis (C) is a byproduct of respiration (D) Comes from carbon dioxide the plants absorb (E) is carried from the Calvin cycle to the light reactions by NADP