chapter 7 PRACTICE!!!

Which molecule reacts with oxaloacetate (four-carbons) to form citrate (six-carbons) in the beginning of the citric acid cycle?

Acetyl CoA

Which of the following is true regarding the electron carrying ability of NADH and FADH2?

FADH2 produces less ATP molecules than that produced by NADH but greater than half

What molecule joins with acetyl CoA in order to produce citrate?

Oxaloacetate

In the citric acid cycle, how many molecules of ATP are produced per molecule of acetyl CoA that enters the cycle?

1

How many molecules of NADH are produced from 2 glucose molecules through the citric acid cycle?

12

The conversion of oxaloacetate to citrate in the Krebs cycle requires the addition of how many carbon atoms?

2

What are the net products of the Krebs cycle from one glucose molecule?

6 NADH, 2 FADH2, 2 GTP, 4 CO2 - The Krebs cycle is very important for the production of the electron carriers NADH and FADH2. NADH is produced in a higher quantity, partially due to the fact that it is more energetically favorable during the electron transport chain. During one turn of the Krebs cycle, one acetyl-CoA is used to generate a CoA residue, three NADH, one GTP, one FADH2, and two carbon dioxide. Each glucose molecule produces two acetyl-CoA, fueling two turns of the Krebs cycle and doubling these amounts. The net products of glycolysis are 2 pyruvate, 2 ATP, and 2 NADH.

After Glycolysis and the Citric Acid Cycle (Kreb's Cycle), most of the energy from the original glucose molecule is now in the form of what?

High-energy electrons associated with electron carriers

Where does the Krebs Cycle occur in human beings?

Mitochondrial matrix

What product is produced in the highest quantity during the Krebs cycle?

NADH

Which high energy intermediate is produced when pyruvate and coenzyme A react to form acetyl-CoA and carbon dioxide?

NADH

What are high energy intermediates produced during the citric acid cycle?

NADH and FADH2

In the absence of oxygen, pyruvate from glycolysis cannot be further utilized for energy synthesis through the Krebs cycle because

There is not NAD+ to react with pyruvate and convert it to acetyl CoA

The relase of CO2 during the Krebs cycle is a result of which type of reaction?

decarboxylation

In the Krebs cycle, malate and NAD+ are converted to NADH and oxaloacetate. The malate converts to oxaloacetate by having one of its alcohol groups converted into a carbonyl. From the perspective of malate, this type of reaction is an example of what?

oxidation

__________ is the loss of electrons caused by __________ agents.

oxidation; oxidizing