Biology Chapter 6 HW

A single "turn" of the Krebs cycle will yield

1 ATP, 3 NADH, 1 FADH2

As glucose is oxidized, energy is released.

TRUE

During glycolysis, a 6-carbon sugar diphosphate molecule is split into two 3-carbon sugar phosphate molecules.

TRUE

How would the electron transport chain be affected if oxygen was not present in the cell?

The electron transport chain would stop because the carrier proteins would have no way to unload electrons.

Before entering the Krebs cycle, pyruvate is converted to

acetyl CoA.

During the Krebs cycle, carbon atoms are released from the substrates as

carbon dioxide molecules

The image below shows a normally functioning mitochondrial electron transport chain. The alternative pathway seen in flowers of Philodendron solimosense diverts electrons away from the transport chain before they reach the third and fourth membrane proteins. What are the consequences of diverting these electrons from the transport chain? (Select all that apply.)

-ATP synthase generates fewer ATP per unit time. -More energy is lost as heat. -The chance of pollination is increased.

The NET result of glycolysis of one glucose molecule is the formation of

2 NADH and 2 ATP.

What is the theoretical yield of ATP from the cellular respiration of one glucose molecule?

36

What product of cellular respiration is used to power the basic activities of cells, such as membrane transport, DNA and protein synthesis, and moving materials within the cell?

ATP

Oxygen is a product of the electron transport chain.

FALSE

How do the products of glycolysis and Krebs cycle relate to the electron transport chain?

Glycolysis and the Krebs cycle produce the molecules that shuttle electrons to the electron transport chain.

In the diagram below, click on the area of the cell where the electron transport chain is found.

Inner Membrane

Where in the cell is the enzyme that produces the most ATP during cellular respiration?

Inner Membrane

Why is cellular respiration important?

It generates ATP, which cells can use to do work.

In theory, yeast cells conducting alcoholic fermentation produce about 1 kg of ethanol for every 2 kg of glucose. Where does the extra kilogram of mass go?

It is released as carbon dioxide gas.

Using the diagram below, select the area of the cell where the Krebs cycle occurs.

Matrix

During fermentation pathways, what molecule is regenerated that is essential for glycolysis to continue, allowing the production of a small amount of ATP in anaerobic conditions?

NAD+

When oxygen accepts electrons, water is produced as a by-product.

TRUE

The electrons that are transferred through the electron transport system in cellular respiration initially belonged to

glucose

When oxygen is absent, the end-product of glycolysis is converted to

lactic acid.

In glycolysis, glucose is converted to

pyruvate

The Krebs cycle turns three times for each glucose molecule.

FALSE

Under aerobic conditions, the end product of glycolysis is further reduced to yield more ATP.

FALSE