Unit 5 Study Guide: Cellular Energy

Atoms and/or molecules that have gained or lost electrons are ions, and the electrons from these ions actively pump H+ against concentration gradients to generate ATP in both photosynthesis and cellular respiration.

• True

• False

• Ions are formed by the addition of neutrons only

• Ions are unrelated to ATP production

Identify the process that occurs when the bond between the second and third phosphates in ATP is broken. ATP, or adenosine triphosphate, acts as a rechargeable battery in cells; when the bond between the second and third phosphates is broken, energy is released.

• Energy is released

• Energy is stored

• Nothing happens

• ATP becomes completely inactive

Which of the following correctly identifies the reactants and products of photosynthesis as per the chemical equation: 6CO2 + 6H2O + sunlight → C6H12O6 + 6O2?

• Reactants: Carbon Dioxide and Water; Products: Glucose and Oxygen.

• Reactants: Glucose and Oxygen; Products: Carbon Dioxide and Water.

• Reactants: Carbon Dioxide and Glucose; Products: Water and Oxygen.

• Reactants: Water and Oxygen; Products: Glucose and Carbon Dioxide.

Photosynthesis is important to all living things because the sugars (glucose) made by photosynthesis provide the chemical energy used either directly or indirectly by nearly all life forms on Earth. Which of the following is the primary reason?

• It provides chemical energy.

• It produces oxygen.

• It creates carbon dioxide.

• It produces water.

A pigment is any substance that can absorb light energy, often absorbing only part of the spectrum and reflecting some wavelengths seen as different colors. The pigment that most plants use to absorb light and transfer energy to electrons in PSII and PSI is _____?

• Chlorophyll

• Carotene

• Anthocyanin

• Xanthophyll

Which answer best summarizes the light dependent reactions?

• Water is broken down, photosystem II takes place, then Photosystem I

• Photosystem I, water is broken, then photosystem II

• hydrogen ions are pumped, water is broken, photosystem I, then photosystem II

• ATP synthase, water is broken, Photosystem II takes place, then photosystem I

Where do the light dependent reactions take place?

• The light dependent reaction takes place in the thylakoid membrane of the chloroplast.

• The light dependent reaction takes place in the cytoplasm.

• The light dependent reaction takes place in the mitochondrial matrix.

• The light dependent reaction takes place in the nucleus.

The light independent reactions, which involve cyclic reactions, take place in the stroma of the chloroplast.

• True

• False

The Calvin cycle uses the products of the light dependent reactions to build sugars. Which products are required for this process?

• ATP and NADPH

• ADP and NADP+

• ATP and NADH

• ADP and NADPH

Which of the following statements correctly describes electron carrying molecules as they relate to photosynthesis and cellular respiration?

• NADP+ becomes NADPH used in photosynthesis; NAD+ becomes NADH and FAD+ becomes FADH2 used in cellular respiration.

• NAD+ becomes NADPH used in photosynthesis; FAD+ becomes FADH2 used in photosynthesis.

• Only NAD+ becomes NADH in photosynthesis; NADP+ is not involved.

• FAD+ becomes FADH2 used exclusively in photosynthesis.