Cell Respiration Review

Which statement is true about mitochondrial DNA and ribosomes?

• Mitochondria do not have DNA or ribosomes - they are organelles not cells

• Mitochondria have circular DNA and smaller ribosomes than eukaryotic cells - they evolved from prokaryotes.

• Mitochondria have linear DNA and 80S ribosomes - they are eukaryotic cells

• Mitochondrial DNA codes for all proteins needed in the electron transport chain but they use the ribosomes on the RER of the cell

What is a requirement for the accurate measurements of the rate of respiration using a respirometer?

• CO₂ must be absorbed by water so that only O₂ production is measured

• Temperature must be kept constant so that the volume changes are only due to O₂ use

• Anaerobic organisms are better to use than aerobic ones as they will produce larger volume changes

• Warm-blooded animals are better to use than cold-blooded animals as they do not change the temperature of the container

Which gas produces most of the bubbles in bread dough?

• Oxygen

• Methane

• Carbon dioxide

• Water vapour

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What feature of carbon makes it most suitable as a basis for life?

• Its abundance in nature

• Its bonding properties

• Its reactivity to light

• Its presence in the early atmosphere of the Earth

Which process causes ADP to change to ATP?

• Hydrolysis

• Protein synthesis

• DNA replication

• Anaerobic cell respiration

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A cricket was placed in a respirometer at constant temperature for 10 minutes. The soap bubble moved along the pipette. What was measured by the movement of the soap bubble?

• Production of carbon dioxide

• Volume of excretory products

• Oxygen consumption

• Release of heat

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The graph shows the changes in lactate and pyruvate measured in an athletes blood during and following a mild exercise period as compared to the period before the exercise. What do these curves suggest?

• Before the exercise there was no pyruvate produced because there was no cell respiration

• During the exercise there was not enough oxygen available for cell respiration so the process was partly anaerobic

• During the exercise the level of lactate increased due to aerobic respiration

• After the exercise the level of lactate decreased because there was enough pyruvate to be used for anaerobic cell respiration

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How many carbon atoms does each pyruvate feed into the Krebs Cycle?

• 1
• 2
• 3
• 4

Considering only glycolysis and the conversion of pyruvate to acetyl CoA, how many NADH molecules will be produced from one glucose molecule?

• 1
• 2
• 3
• 4

For every molecule of glucose, how many molecules of FADH₂ are produced by the Krebs Cycle?

• 1
• 2
• 4
• 6

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