Bio Ch 7 Quiz

Front 1

Where do the light reactions take place?

Back 1

in the thylakoid membrane

Front 2

Photorespiration occurs when _____.

Back 2

oxygen is combined with ribulose bisphosphate and
stomata are closed

Front 3

In most land plants, photosynthesis occurs in cells of the _____ of the leaves, because these cells contain the largest numbers of chloroplasts.

Back 3

mesophyll

Front 4

Why is the use of carbon dioxide in the dark reactions important?

Back 4

Fixation of carbon dioxide in the dark reactions makes it usable for all life-forms.

Front 5

Where do the light-independent, carbon-fixing reactions occur?

Back 5

in the chloroplast stroma

Front 6

Why is carbon dioxide a key molecule in the light-independent reactions of photosynthesis

Back 6

Carbon dioxide, together with water, is the raw material for the synthesis of sugars, which are the key products of the light-independent reactions.

Front 7

What is the role of the dark reactions of photosynthesis

Back 7

The dark reactions convert carbon dioxide to sugar.

Front 8

Which of the following represents the products of the light-dependent reactions of photosynthesis? For what process are these products needed?

Back 8

NADPH and ATP; Calvin-Benson cycle

Front 9

You have just discovered a new plant with red-orange leaves. What wavelengths of visible light are not being absorbed by this pigment

Back 9

red and orange

Front 10

What is the role of electron transport in ATP synthesis?

Back 10

Electron transport creates a proton gradient that is used to supply energy for the synthesis of ATP.

Front 11

Leaves include a number of structural modifications for the purpose of photosynthesis, including _____.

Back 11

A. adjustable openings in the surface of the leaf that permit the passage of carbon dioxide, water, and oxygen
B. a waxy covering on the surface of the leaf that is designed to reduce evaporation

Front 12

Take a deep breath and slowly exhale. The oxygen in that breath is being used by your mitochondria in reactions that produce ATP from sugars and other food molecules you ate. Where did that oxygen come from originally?

Back 12

The oxygen in the air is produced by the splitting of water during the light-dependent reactions of photosynthesis.

Front 13

The term carbon fixation refers to _____.

Back 13

the incorporation of atmospheric carbon dioxide into a larger organic molecule

Front 14

When photosystem I absorbs a photon, electrons are ejected from the reaction center. What is the final destination of these electrons?

Back 14

Electrons end up being captured by the electron carrier NADPH.

Front 15

Where do the dark reactions take place?

Back 15

in the stroma

Front 16

Which of the following is a TRUE statement photosynthesis?

Back 16

in photosynthesis, inorganic molecules such as carbon dioxide and water react to produce organic, energy-rich molecules such as glucose

Front 17

How are the electrons lost from photsytem II replaced?

Back 17

the result when water splits with oxygen as by-product

Front 18

in light-dependent reactions of photsynthesis, the difference in hydrogen ion concentration across the thylakoid membrane is used to generate

Back 18

ATP

Front 19

What is not required for the light- independent reactions of photosynthesis

Back 19

oxygen