9.2 QUIZ

Match the following

• pigment

• light absorbing molecules used by plants to gather the sun's energy

• thylakoid

• sac-like photosynthetic membranes found in chloroplasts

• NADP⁺

• carrier molecule that transfers high-energy electrons from chlorophyll to other molecules

Match the following

• light-independent reactions

• principal pigment of plants and other photosynthetic organisms

• stroma

• energy from ATP and NADPH is used to make sugar

  (aka Calvin Cycle)

• chlorophyll

• fluid portion of the chloroplast; outside of the thylakoids

• light-dependent reactions

• reactions that produce ATP and NADPH

During photosynthesis, cells capture the energy of sunlight using ​ (a)   , which is a type of ​ (b)   . Photosynthesis also relies on a compound called ​ (c)   , which is an electron ​ (d)   that accepts and transfers high-energy electrons.

• stroma

• chlorophyll
• pigment
• NAPD
• carrier
• hormone
• source
• stroma
• glucose

During photosynthesis, carbon dioxide and ​ (a)   are converted through a series of reactions into two products: high-energy ​ (b)   and ​ (c)   gas.

• oxygen
• sodium chloride

• water
• methane

• sugars
• hydrocarbons
• hydrogen
• sunlight

This diagram shows the structure of a chloroplast.

Sandra wants to modify the diagram to include chlorophyll. Which would be the most useful strategy?

• Add representations of chlorophyll molecules inside the stroma.

• Add representations of chlorophyll molecules on the outer membrane.

• Group two or more grana together, and label them as chlorophyll.

• Add an enlarged illustration of a thylakoid, and represent chlorophyll molecules in the thylakoid membrane.

Vernon is using the diagram shown below to develop a model of  photosynthesis. The letters A, B, and C each represent a reactant or product of the process.

Should water (H₂O) be included in the model as a reactant or product? If so, how should it be included?

• Yes, as reactant A.

• Yes, as product B.

• Yes, as reactant C.

• No, it should not be included.

Vernon is using the diagram shown below to develop a model of  photosynthesis. The letters A, B, and C each represent a reactant or product of the process.

What is the role of compound C?

• a reactant that provides the energy for assembling sugars

• a reactant that provides the carbon and hydrogen for sugars

• a reactant that provides the carbon and oxygen for sugars

• a product that forms along with sugars

Vernon wonders whether NADPH and ATP should be classified as reactants or as products of photosynthesis. How should these compounds be classified?

• as reactants, because they are used up by photosynthesis

• as products, because they are generated by photosynthesis

• as either reactants or products, depending on the rate that photosynthesis occurs

• as neither reactant nor product, because they are recycled instead of made or used up

What best describes the relationship between the two sets of reactions of photosynthesis, which are the light-dependent reactions and the light-independent reactions?

• Each set produces sugars, and by working together they produce more sugars than they would produce separately.

• Each set produces half of a sugar molecule, and later the two halves are joined together.

• Only the light-dependent reactions produce sugars, but they depend on products of the light-independent reactions.

• Only the light-independent reactions produce sugars, but they depend on products of the light-dependent reactions.

The chemical formula for glucose, a simple sugar, is C₆H₁₂O₆. When a glucose molecule is assembled during photosynthesis, the process takes up 12 hydrogen ions from the stroma of the chloroplast. What process adds 12 hydrogen ions to the chloroplast?

• 6 water molecules splitting apart during the light-dependent reactions

• 12 water molecules splitting apart during the light-dependent reactions

• 12 water molecules splitting apart during the light-independent reactions

• other sugar molecules reacting with oxygen in the chloroplast