Biochemical Cycling Practice Quiz

Question 1

What is the significance of C HOPKINS CaFe?

Answer 1

It is a mnemonic reminder of the core set of elements that all living organisms require

Question 2

What is biogeochemical cycling?

Answer 2

Transitioning elements between their organic and inorganic forms

Question 3

From where does a chemoheterotroph obtain its energy?

Answer 3

From organic molecules

Question 4

From where does a chemoautotroph obtain its energy?

Answer 4

From reduced inorganic compounds and minerals (Fe2+, H2S, etc.)

Question 5

What event in Earth’s history allowed for complex organisms (plants and animals) to develop?

Answer 5

Accumulation of oxygen in the atmosphere

Question 6

What is the main purpose of the Calvin Cycle?

Answer 6

Generating glyceraldehyde 3- phosphate

Question 7

Considering that the Calvin Cycle is a cycle, what are the products of the Calvin Cycle? Select all that apply.

Answer 7

Ribulose 1,5-bisphosphate and Glyceraldehyde 3-phosphate

Question 8

Which organisms fix carbon using the Calvin Cycle?

Answer 8

Photoautotrophs

Question 9

Which organisms fix carbon using the reductive TCA cycle?

Answer 9

Chemoautotrophs

Question 10

From where does a photoheterotroph obtain its organic carbon?

Answer 10

From organic molecules

Question 11

Where do the organisms that carry out the Reductive TCA cycle obtain their energy?

Answer 11

From reduced inorganic compounds?

Question 12

Where do the organisms that carry out the Calvin Cycle obtain their energy?

Answer 12

From sunlight

Question 13

What molecule provides the reducing power for the Calvin Cycle?

Answer 13

NADPH

Question 14

Which step uses the enzyme, Glutamine synthetase in Nitrogen Cycle?

Answer 14

Assimilation

Question 15

Which step uses the enzyme, Nitrogenase in Nitrogen cycle?

Answer 15

Nitrogen fixation

Question 16

Which step removes nitrogen from the soil and makes it unavailable to plants?

Answer 16

Dinitrofixation

Question 17

Which step uses the enzyme dinitrogenase?

Answer 17

Nitrogen fixation

Question 18

What is the end product of nitrogen fixation?

Answer 18

Ammonia

Question 19

What is the end product of nitrification?

Answer 19

Nitrate

Question 20

What general type of reaction is carried out here?

2 NO3- —> N2

Answer 20

Reduction?

Question 21

What general type of reaction is carried out here?

NH4+ –> NO3-

Answer 21

Oxidation

Question 22

To what does “diazotrophic” refer?

Answer 22

Nitrogen-fixing organisms

Question 23

What type of organisms might be diazotrophic?

Answer 23

Some bacteria and some archaea

Question 24

What specific process is occurring when Ammonia (NH4+) is made into Nitrite or NItrate?

Answer 24

Nitrification

Question 25

What specific process is occurring when N2 is made into NH4+?

Answer 25

Fixation

Question 26

What specific process is occurring when Ammonia is made into organic molecules?

Answer 26

Assimilation

Question 27

What are SUBSTRATES of the reaction mediated by Glutamate synthase?

Answer 27

Glutamine α-ketoglutarate

Question 28

Which pathway would most likely be used when cellular energy levels are low?

Answer 28

Pathway B

Question 29

Which pathway would most likely be used when ammonium concentrations are low?

Answer 29

Pathway A

Question 30

What is the product of step E in the Sulfur metabolism

Answer 30

Organic sulfur compounds

Question 31

What molecule provides the reducing power for the reduction of sulfate?

Answer 31

NADPH