Exam 19: The Citric Acid Cycle

Exhibit 19A The following compounds are all intermediates in the citric acid cycle. Refer to Exhibit 19A.Which intermediate is formed from fumarate?

An organism that undergoes the glyoxylate cycle can make sugar from fat because:

The citric acid cycle uses anaplerotic reactions to get rid of the many intermediates of the cycle that accumulate during catabolism of amino acids.

"Energy charge" in a cell is a measure of

The anaplerotic reactions associated with the citric acid cycle are the result of

A control point outside the citric acid cycle is the reaction catalyzed by

The glyoxylate cycle occurs in

The citric acid cycle is amphibolic,meaning

In which cellular location do the majority of the reactions of the citric acid cycle take place?

Intermediates of the citric acid cycle are especially important in the synthesis of fatty acids and amino acids.

A cell in an active metabolic state has

All but one of the enzymes of the citric acid cycle are found in this part of the mitochondrion:

The order of compounds and intermediates found in the citric acid cycle is as follows:

Which of the following enzymes contains a non-heme iron?

The conversion of malate to oxaloacetate has a high +DG (it is endergonic).It can take place because:

The enzymes involved in the pyruvate dehydrogenase complex are

Which of the following is a source of NADPH?

The iron ion,which is part of succinate dehydrogenase,is bonded to heme.

In muscle cells,the following reaction proceeds as written,i.e.,from left to right,despite having DG°' » +30 kJ/mol.How can this occur? malate + NAD⁺ oxaloacetate + NADH + H⁺

Release of succinate from succinyl-CoA can be coupled to GTP synthesis because: