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AP Biology Cellular Respiration — practice questions

Explore 59 free Cellular Respiration questions in AP Biology Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Cellular Respiration questions and exercises with answers

Showing questions 1–30 of 59.

The first pathway used to break glucose down and extract free energy is:Read the answer and worked solution →Glycolysis begins with one glucose molecule and ends with two molecules of:Read the answer and worked solution →Glycolysis is described as anaerobic because it:Read the answer and worked solution →Which molecule carries the acetyl group from pyruvate into the citric acid cycle?Read the answer and worked solution →The reduced electron carrier produced when NAD+ picks up high-energy electrons is:Read the answer and worked solution →Paired reactions in which one molecule is oxidised while another is reduced are called:Read the answer and worked solution →At the end of the electron transport chain, the electrons are finally accepted by:Read the answer and worked solution →Glycolysis invests two ATP early and forms four ATP later, giving a net gain per glucose of:Read the answer and worked solution →The enzyme that catalyses the very first step of glycolysis is:Read the answer and worked solution →Which enzyme cleaves fructose-1,6-bisphosphate into two three-carbon molecules?Read the answer and worked solution →If NAD+ is unavailable, the second half of glycolysis:Read the answer and worked solution →The citric acid cycle differs from glycolysis in that it is:Read the answer and worked solution →The first step of the citric acid cycle joins a two-carbon acetyl group to a four-carbon molecule, forming:Read the answer and worked solution →Each turn of the citric acid cycle produces how many NADH molecules?Read the answer and worked solution →Chemiosmosis accounts for roughly what share of the ATP made during glucose catabolism?Read the answer and worked solution →Making ATP by chemiosmosis is called oxidative phosphorylation because the process involves:Read the answer and worked solution →How many complexes make up the electron transport chain?Read the answer and worked solution →The mobile carrier connecting the first and second complexes to the third is:Read the answer and worked solution →Hydrogen ions pumped by the electron transport chain accumulate in the:Read the answer and worked solution →The citric acid cycle is described as amphibolic because its intermediates can also be used to:Read the answer and worked solution →Where does the carbon dioxide released during cellular respiration come from?Read the answer and worked solution →In type 2 diabetes the oxidation efficiency of NADH is reduced, which affects:Read the answer and worked solution →Walk glucose through respirationRead the answer and worked solution →Match each enzyme to its stepRead the answer and worked solution →Count the yieldsRead the answer and worked solution →Needs oxygen or not?Read the answer and worked solution →Complete the ATP accountingRead the answer and worked solution →True or false: cellular respirationRead the answer and worked solution →Which stage does it belong to?Read the answer and worked solution →Plants, algae and cyanobacteria that use light to make their own food are called:Read the answer and worked solution →

Worked practice questions

The first pathway used to break glucose down and extract free energy is:

  1. Glycolysis
  2. Hydrolysis
  3. Proteolysis
  4. Photolysis
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Correct answer: A. Glycolysis

1. Glucose catabolism runs through several pathways in a fixed order. 2. The opening pathway acts on the intact six-carbon sugar. 3. Glycolysis is the first pathway used in the breakdown of glucose to extract free energy. 4. Used by nearly all organisms on earth today, it likely evolved as one of the first metabolic pathways. _Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 7 'Cellular Respiration', sections 7.1-7.7_

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Glycolysis begins with one glucose molecule and ends with two molecules of:

  1. Lactate
  2. Pyruvate
  3. Ethanol
  4. Citrate
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Correct answer: B. Pyruvate

1. Glucose is a six-carbon ring-shaped sugar. 2. Glycolysis splits that ring evenly in two. 3. Glycolysis begins with the six carbon ring-shaped structure of a single glucose molecule and ends with two molecules of a three-carbon keto acid called pyruvate. 4. Lactate and ethanol appear only later, in fermentation. _Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 7 'Cellular Respiration', sections 7.1-7.7_

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Glycolysis is described as anaerobic because it:

  1. Uses no oxygen
  2. Uses no water
  3. Uses no carbon
  4. Uses no enzymes
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Correct answer: A. Uses no oxygen

1. Aerobic and anaerobic describe whether a pathway needs oxygen. 2. Glycolysis runs in the cytoplasm without any oxygen present. 3. The process does not use oxygen and is therefore anaerobic. 4. It certainly uses enzymes and water, so those options misread the term. _Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 7 'Cellular Respiration', sections 7.1-7.7_

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