 |
| 1 | |
Chloroplasts are the organelles responsible for carrying out photosynthesis in plants and algae. |
| | A) | True |
| | B) | False |
|
|
|
| 2 | |
Which of the following statements about electromagnetic radiation is incorrect? (p. 156) |
| | A) | Light in the visible portion of the electromagnetic spectrum powers photosynthesis. |
| | B) | Visible light comprises a small percentage of the electromagnetic spectrum of the sun. |
| | C) | Photons of visible light can be absorbed by molecules in living cells in a way that does not permanently harm the molecules. |
| | D) | Electromagnetic radiation travels as waves caused by the oscillation of electric and magnetic fields. |
| | E) | Electromagnetic radiation with a long wavelength will have greater energy than one with a short wavelength. |
|
|
|
| 3 | |
True or False: CO2 from the atmosphere is utilized during the light reaction as a source of carbon. |
| | A) | True |
| | B) | False |
|
|
|
| 4 | |
The addition of an oxygen molecule to ribulose bisphosphate (RuBP) resulting in phosphoglycolate is most accurately referred to as |
| | A) | oxidative phosphorylation. |
| | B) | photorespiration. |
| | C) | photophosphorylation. |
| | D) | aerobic respiration. |
| | E) | phosphorespiration. |
|
|
|
| 5 | |
Organisms which synthesize organic molecules from inorganic sources using light energy are most accurately referred to as ________, while organisms which must consume organic molecules from their environments to survive are most accurately referred to as ________. |
| | A) | heterotrophs; photoautotrophs |
| | B) | plants; animals |
| | C) | photoautotrophs; chemoautotrophs |
| | D) | photoautotrophs; heterotrophs |
| | E) | auxotrophs; autotrophs |
|
|
|
| 6 | |
Calvin cycle reactions occur in the ________, while light reactions occur in the ________. |
| | A) | stroma; thylakoid membranes |
| | B) | thylakoid lumen; thylakoid membranes |
| | C) | stroma; thylakoid lumen |
| | D) | thylakoid membranes; inner membrane |
| | E) | intermembrane space; stroma |
|
|
|
| 7 | |
True or False: Pigments are molecules that are able to deflect light energy |
| | A) | True |
| | B) | False |
|
|
|
| 8 | |
When an electron absorbs energy and exists in an excited state, the electron can |
| | A) | drop back down to its original energy level and release light. |
| | B) | be removed from one molecule and transferred to a different molecule. |
| | C) | drop back down to its original energy level and release heat. |
| | D) | drop back down to its original energy level and release light and be removed from one molecule and transferred to a different molecule. |
| | E) | drop back down to its original energy level and release light, be removed from one molecule and transferred to a different molecule, and drop back down to its original energy level and release heat. |
|
|
|
| 9 | |
A primary electron acceptor in Photosystem II is |
| | A) | P700. |
| | B) | D1. |
| | C) | CP43. |
| | D) | pheophytin. |
| | E) | P680. |
|
|
|
| 10 | |
Which of the following statements regarding cyclic electron flow is incorrect? |
| | A) | Cyclic electron flow is favored when NADPH levels are high |
| | B) | ATP is produced via an electrochemical gradient |
| | C) | High energy electrons are transferred to QB via ferredoxin |
| | D) | Cyclic electron flow results in high levels of NADPH |
| | E) | ATP is the final product of cyclic electron flow |
|
|
|
| 11 | |
Which one of the following statements most accurately explains the "enhancement effect" seen in photosynthesis? |
| | A) | The production of protons in photosystem II, combined with the consumption of protons in photosystem I, produce an electrochemical gradient used to synthesize ATP. |
| | B) | The absorption of 1380-nm light results in more than twice the rate of photosynthesis than absorbing light of 680-nm and 700-nm. |
| | C) | 680-nm light activates the pigment in the reaction center of photosystem II, while 700-nm light activates the pigment in the reaction center of photosystem I. |
| | D) | 680-nm light activates the pigment in the reaction center of photosystem I, while 700-nm light activates the pigment in the reaction center of photosystem II. |
| | E) | None of the choices accurately explains the enhancement effect seen in photosynthesis. |
|
|
|
| 12 | |
True or False: The absorption of light in photosystem II results in an electron with a higher energy level than was attained in photosystem I. |
| | A) | True |
| | B) | False |
|
|
|
| 13 | |
Which of the following regarding the light reaction is incorrect? |
| | A) | O2 is produced in the thylakoids lumen via oxidation of water |
| | B) | ATP is produced in the stroma via ATP synthase |
| | C) | NADPH is produced in the stroma and requires 2 electrons in addition to a hydrogen ion. |
| | D) | ATP is consumed to transfer electrons from photosystem II to photosystem I and must be replenished prior to the Calvin cycle. |
| | E) | The light reaction is used to provide energy sources for the Calvin Benson cycle. |
|
|
|
| 14 | |
Which one of the following statements about chloroplast cytochrome b6 and mitochondrial cytochrome b is incorrect ? (Genomes and Proteomes) |
| | A) | Both transport H + across a biological membrane. |
| | B) | They are both products of homologous genes. |
| | C) | Both accept electrons from a quinone. |
| | D) | Both donate electrons to another protein within their respective complexes. |
| | E) | All of the statements about choloroplast cytochrome b6 and mitochondrial cytochrome b are correct. |
|
|
|
| 15 | |
The production of 1 G3P molecule requires |
| | A) | 12 ATP : 18 NADPH and 6CO2 |
| | B) | 12 ATP : 12 NADPH and 6CO2 |
| | C) | 3 6 ATP : 18 NADPH and 6CO2 |
| | D) | 6 ATP : 9 NADPH and 3CO2 |
| | E) | 9 ATP : 6 NADPH and 3CO2 |
|
|
|
| 16 | |
The most common storage form of carbohydrate in chloroplasts is |
| | A) | glucose. |
| | B) | sucrose. |
| | C) | cellulose. |
| | D) | starch. |
| | E) | glyceraldehyde-3-phosphate. |
|
|
|
| 17 | |
Which one of the following statements about Rubisco is incorrect? Rubisco |
| | A) | is perhaps the most abundant protein on Earth. |
| | B) | catalyzes the formation of a six-carbon compound from ribulose bisphosphate and carbon dioxide. |
| | C) | has carboxylase activity. |
| | D) | is believed to have evolved fairly recently in the evolution of plants. |
| | E) | is responsible for the conversion of 3PG to 1,3-BPG. |
|
|
|
| 18 | |
C4 plants are particularly suited for conditions of high temperatures and intense sunlight due to |
| | A) | the presence of altered chlorophyll molecules. |
| | B) | the physical separation of mesophyll cells and bundle sheath cells. |
| | C) | the ability to convert oxaloacetate to malate for storage at night. |
| | D) | the ability of PEP-carboxylase to bind oxygen. |
| | E) | the ability to utilize ATP for the regeneration of PEP from pyruvate. |
|
|
|
| 19 | |
The first product synthesized from photosynthesis in CAM plants is |
| | A) | glucose. |
| | B) | 3-phosphoglycerate (3PG). |
| | C) | oxaloacetate. |
| | D) | RuBP. |
| | E) | malate. |
|
|
|
| 20 | |
Photorespiration occurs when O2 levels are high and CO2 levels are low. |
| | A) | True |
| | B) | False |
|
|
.