Quiz 1

Three molecules of NADH are produced during one turn of the citric acid cycle. How many total ATP molecules can be produced from these three NADH molecules?

7.5 ATP

A high level of ________ in the muscle fiber would slow glycolysis by inhibiting its rate limiting enzyme

ATP

The immediate source of energy for muscular contraction is

ATP

The term lactate refers to_______ a potential end-product of glycolysis the conjugate base of lactic acid the salt of lactic acid all of the above answers are correct

All of the above

The conversion of pyruvate to lactate requires __________ The enzyme lactate dehydrogenase NADH+ H+ Both are correct None of the above are correct

Both are correct

The primary function of the Kreb Cycle is to

Complete the oxidation of carbohydrates, fats, and proteins (i.e. form NADH and FADH)

T/F Compounds that contain carbon are called inorganic compounds

False

T/F The break down of glycogen into glucose is called gluconeogenesis

False

Which of the following are correct about glycolysis: It occurs in the mitochondrial matrix Involves the breakdown of glucose or glycogen into two molecules of pyruvate or lactate Can start with the break down of fatty acids Does NOT produce any ATP

Involves the breakdown of glucose or glycogen into two molecules of pyruvate or lactate

Compared to NADH, FADH produces less ATP because ________ FADH has a lower molecular mass than NADH FADH enters the electron transport chain before NADH The electrons from FADH are donated later in the electron transport chain than those by NADH None of the above are correct

The electrons from FADH are donated later in the electron transport chain than those by NADH

Which of the following statements is true concerning the electron transport chain? The primary purpose of the electron transport chain is to complete the oxidation of carbohydrates. The primary purpose of the electron transport chain is to produce acetyl-CoA. The primary purpose of the electron transport chain is to harvest the energy from electrons moving down this pathway to produce ATP and water. The end-result of the electron transport chain is the formation of lactate.

The primary purpose of the electron transport chain is to harvest the energy from electrons moving down this pathway to produce ATP and water.

T/F In order to be oxidized for the eventual formation of ATP, amino acids must first be converted to Acetyl-CoA or Krebs cycle intermediates

True

Enzymes called kinases are responsible for

adding phosphate groups (i.e phosphorylation of substrates)

In general, the higher the intensity of the activity, the greater the contribution of _________ aerobic energy production anaerobic production The Krebs cycle to the production of the ATP by substrate level phosphorylation None of the above answers are correct

anaerobic energy production

The actual net ATP yield from aerobic metabolism of one molecule of glucose is different from the theoretical yield because ________ . the net production of ATP is higher than previously thought it accounts for the fact that the energy provided by NADH and FADH is required not only for ATP production but also to transport ATP across the mitochondrial membrane it eliminates the ATP derived from NADH all the answers are correct

it accounts for the fact that the energy provided by NADH and FADH is required not only for ATP production but also to transport ATP across the mitochondrial membrane