GED Science : Cell Energy and Metabolism

Study concepts, example questions & explanations for GED Science

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Example Questions

Example Question #26 : Ged Science

Which step in cellular respiration results in the most ATP being produced?

Possible Answers:

Fermentation

The citric acid cycle

Oxidative phosphorylation

Glycolysis

Correct answer:

Oxidative phosphorylation

Explanation:

Cellular respiration is composed of many steps used to break down glucose and convert the chemical energy into ATP. Of the four steps described in the answer choices, oxidative phosphorylation via the electron transport chain is the most effective step for producing ATP. The electron transport chain can produce between 32 and 38 ATP from a single glucose molecule.

Example Question #27 : Ged Science

Where does glycolysis take place in the cell?

Possible Answers:

Mitochondrial matrix

Chloroplast

Cytosol

The intermembrane space

Correct answer:

Cytosol

Explanation:

Glycolysis is the first step of glucose breakdown in cells. This process takes place in the cytosol.

The second step of cellular respiration, the citric acid cycle, takes place in the mitochondrial matrix. The third step, the electron transport chain, takes place on the inner mitochondrial membrane and requires protons to be concentrated within the intermembrane space.

Example Question #28 : Ged Science

What statement about glycolysis is correct?

Possible Answers:

Glycolysis requires the use of the cell's mitochondria

Glycolysis is the breakdown of an 8-carbon sugar to two 4-carbon sugars

Glycolysis occurs in the cytoplasm, without the need for accessory organelles

Glycolysis is not a necessary function for the cell to produce energy

Only animal cells undergo glycolysis; plant cells do not

Correct answer:

Glycolysis occurs in the cytoplasm, without the need for accessory organelles

Explanation:

Glycolysis is the first step in cell metabolism. It is responsible for converting glucose (a 6-carbon sugar) into two molecules of pyruvate (a 3-carbon sugar). Glycolysis occurs in the cytoplasm, where the sugar molecules interact directly with enzymes. After pyruvate is created, it is transported to the mitochondria for the remainder of cellular respiration (the citric acid cycle and electron transport chain).

Though plants undergo photosynthesis, they also use cellular respiration. Glycolysis takes place in both animal and plant cells.

Example Question #29 : Ged Science

Photosynthesis is a process that plants use to create energy.

What is the formula for photosynthesis?

Possible Answers:

None of these

Correct answer:

Explanation:

Photosynthesis is the process by which plants use the sun's energy to convert water  and carbon dioxide  into glucose  and oxygen .

Example Question #30 : Ged Science

Many chemical reactions are carried out by various cell organelles. 

Which of the following cell organelles carries out the reaction described by the equation ?

Possible Answers:

Golgi apparatus

Ribosome

Nucleus

Mitochondria

Lysosome

Correct answer:

Mitochondria

Explanation:

The equation  is the equation for cellular respiration. Cellular respiration happens inside the mitochondria and chloroplast for those cells containing chloroplasts.

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