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FREE BIOLOGY AND STUDY GAMES ABOUT CHAPTER 9
BIOLOGY EXAM QUESTIONS
Actual Qs and Ans Expert-Verified Explanation
This Exam contains:
-Guarantee passing score -47 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation
Question 1: What best describes the electron transport chain?
Answer:
electrons passing from one carrier to another, releasing a little energy at each step Question 2: Most of the NADH that delivers high-energy electrons to the electron transport chain comes from ______.
Answer:
chemiosmosis
Question 3: What happens at the very end of the chain in cellular respiration?
Answer:
oxygen pulls electrons down the chain in an energy-yielding tumble. The energy yielded is used to regenerate ATP.
Question 4: What is fermentation all about?
Answer:
produces ATP without the use of oxygen, cellular respiration requires O2 to produce ATP, glycolysis can produce ATP with or without O2 (in aerobic /anaerobic condtions), and in the absence of O2, glycolysis couples with fermentation to produce ATP
Question 5: The function of cellular respiration is to _____.
Answer:
extract usable energy from glucose Question 6: The energy given up by electrons as they move through the electron transport chain is used to ____.
Answer:
pump H+ through a membrane
Question 7: If humans did not breathe in O2, we wouldn't ___.
Answer:
make enough ATP to meet our energy requirements
Question 8: What's the definition of faculative anaerobes?
Answer:
they can use oxygen when it's present
Question 9: Explain what anaerobic respiration is all about.
Answer:
Glycolysis is part of this process and does not use and oxygen in any of the nine steps.Question 10: How much ATP can a cell make from one glucose molecule in the presence of carbon monoxide?
Answer:
2ATP
Question 11: What is a good example of lactic acid fermentation?
Answer:
cheese and yogurt
Question 12: What's the definition of reduction?
Answer:
a substance gains electrons, or is reduced (the amount of positive change is reduced)
Question 13: Explain where and how the respiratory electron transport chain creates a proton gradient.
Answer:
the protons in the intermembranous space are at a higher concentration than in the matrix. This produces a gradient of difference in ion gradient. The energy stored in this gradient is used the synthesis of ATP.Question 14: After completion of the Krebs cycle, most of the usable energy from the origainl glucose molecule is in the form of _______.
Answer:
NADH
Question 15: Name the three stages of cellular respiration.
Answer:
Glycolysis, The Citric Acid Cycle, and Oxidative Phosphorylation
Question 16: What's alcohol fermentation?
Answer:
pyruvate is converted to ethanol in two steps, with the first releasing CO2 Question 17: When protein molecules are used as fuel for cellular respiration, ___ are produced as waste.
Answer:
amino groups
Question 18: What are the types of fermentation?
Answer:
alcohol and lactic acid Question 19: During respiration in an eukaryotic cell, the electron transport chain is located in or on the _______.
Answer:
cristae of the mitochondrion
Question 20: An electron carrier acts as an energy-storage molecule when it's _____.
Answer:
reduced...NADH
Question 21: In brewing beer, maltose (a disaccharide) is ___.
Answer:
the substrate for alcoholic fermentation
Question 22: What's the definition of obligate anaerobes?
Answer:
they'll die when exposed to atmospheric levels of oxygen Question 23: In glycolysis in the absence of oxygen, cells need a way to regenerate which compound?
Answer:
NAD+ Question 24: Explain in general terms how redox reactions are involved in energy exchanges.
Answer:
Some do not transfer electrons but the electron sharing in covalent bonds
Question 25: Why is the Krebs cycle called a cycle?
Answer:
the two-carbon acetyl coA binds to a four-carbon molecule that's restored at the end of the cycle
Question 26: In cellular respiration, what does glycolysis do?
Answer:
it breaks down glucose into two molecules of pyruvate Question 27: In the Krebs cycle, the energetic production per glucose molecule is _______.
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