Chapter 6: Cellular Respiration - Obtaining Energy from Food

This figure shows the different processes of cellular respiration. Which correctly identifies the different processes?

1. glycolysis, 2. citric acid cycle, 3. electron transport

Fat molecules store 9 kcal per gram. There are about 454 grams in a pound of fat, so one pound of fat stores about 4,000 kcal of energy. If running at a moderate pace for one hour burns about 800 kcal of energy, how many hours must a person run to burn the energy stored in one pound of fat?

5 hours

Which molecule would be found after the action of the enzymes in cellular respiration?

ATP

Some prokaryotic and all eukaryotic cells use oxygen to harvest energy from food molecules. In what form is that harvested energy available to power cell work?

ATP molecules

What will happen to the process of aerobic cellular respiration if no O2 is available in the cell?

Aerobic cellular respiration will stop

You are given a sample taken from a living organism but are not told what kind of organism, only that it was denied oxygen in the container which held it. If you did a biochemical analysis, what would most likely be present in a sample of this organism?

a)alcohol or c)lactic acid

If a cell is unable to perform aerobic cellular respiration, what will then happen?

No ATP will be produced, causing all energy-requiring cell functions to cease.

The figure shows an overview of the different entry pathways to cellular respiration for different macromolecules. Why are none of the digestive products entering the electron transport chain directly?

The electron transport chain only receives electrons carried by reduced electron carrier molecules such as NADH.

One of the products of the citric acid cycle is CO2. This molecule is considered a waste molecule, since organisms performing aerobic cellular respiration will release it into the atmosphere. What reactant provided the carbon atoms used to produce this CO2?

pyruvic acid

Oxygen as O2 is required for aerobic cellular respiration. The function of O2 in this process is

to accept the spent electrons at the end of the electron transport chain.