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Chapter 9-2
The Krebs Cycle and Electron Transport
11
Biology
10th Grade
12/10/2008

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Cards

Term

 

 

 

 

 

aerobic

Definition

 

 

 

 

 

process that requires air

Term

 

 

 

 

Krebs cycle

Definition

 

 

 

 

The second stage of cellular respiration, in which pyruvic acid is broken down into carbon dioxide in a series of energy-extracting reactions (p. 226)

Term

 

electron

transport

chain

Definition

 

 

 

 

a series of proteins in which the high-energy electrons from the Krebs cycle are used to convert ADP into ATP (p 228)

Term

 

 

What happens

during the Krebs cycle?

Definition

 

 

 

During the Krebs cycle, pyruvic acid is broken down into carbon dioxide in a series of energy-extracting reactions.

Term

 

 

 

How are high-energy electrons

used by the electron transport chain?

Definition

 

 

The electron transport chain uses high-energy electrons from the Krebs cycle to convert ADP into ATP.

Term

 

Why is the Krebs cycle

 also known as

 the citric acid cycle?

Definition

Part A ends with citric acid,

 then in Part B the citric acid is broken down which ends up as ATP to be used for cellular activity (energy!).

See page 227 in text book

Term

 

 

Why do runners

breathe heavily after a race?

Definition

You can think of a quick sprint building up an oxygen debt that a runner has to repay after the race with plenty of heavy breathing.

 

When the race is over, the only way to get rid of lactic acid is in a chemical pathway that requires extra oxygen.

Term

 

 

 

Quick energy

Definition

lactic acid fermentation

 

(Can usually suppy enough ATP to last about 90 seconds for a quick sprint.)

Term

 

 

Long-term energy

Definition

 

 

For exercise longer than about 90 seconds, cellular respiration is the only way to generate a continuing supply of ATP.

Term

 

 

 

Comparing photosynthesis ad Cellular Respiration

Definition

They are almost opposite processes. 

 

Earlier in the chapter, the chemical energy in carbohydrates was compared to money in a savings account.  Photosynthesis is the process that "deposits"  energy.  Cellular respiration is the process that "withdraws" energy. The equations for photosynthesis and cellular respiration are the reverse of each other.

Term

 

 

What happens to pyruvic acid during the Kreb cycle?

Definition
During the Krebs cycle, pyruvic acid from glycolysis is used to make carbon dioxide, NADH, ATP, and FADH 
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