FREE AND STUDY GAMES ABOUT CHAPTER 7 HW EXAM

PDF Download

FREE AND STUDY GAMES ABOUT CHAPTER 7 HW EXAM

QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -79 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: When it first appeared, anoxygenic photosynthesis most likely used what molecule as a source for hydrogen atoms?

Answer:

H2S Question 2: According to our current understanding, how did cellular respiration evolve?

Answer:

The different steps in cellular respiration evolved over time.Question 3: Aerobic respiration employs the same type of proton pumps as which of the following?

Answer:

photosynthesis Question 4: The most primitive forms of life probably obtained chemical energy by degrading ______ molecules that were abiotically produced.

Answer:

organic

Question 5: The second major event in the evolution of metabolism was most likely which of the following?

Answer:

Glycolysis Question 6: Which of the following parts of ATP synthase is composed of the stalk and a knob?

Answer:

F1 Question 7: The F0 subportion of ATP synthase contains the membrane-bound complex, and the F1 subportion consists of which of the following?

Answer:

Stalk and catalytic head Question 8: What molecule is considered to be the energy currency of the cell and is used to do work?

Answer:

ATP

Question 9: When NAD+ is reduced it becomes ______.

Answer:

NADH Question 10: Which of these statements correctly indicate the location of pyruvate oxidation?

Answer:

In prokaryotic cells, oxidation of pyruvate occurs in the cytoplasm.

In eukaryotic cells, oxidation of pyruvate occurs in the mitochondria.Question 11: Almost all molecules that are catabolized for energy are converted into which of the following?

Answer:

Acetyl-CoA

Question 12: Anoxygenic ________ evolved in the absence of oxygen and allowed some organisms to use light energy to pump protons.

Answer:

photosynthesis Question 13: Glycolysis results in a net gain of _______ ATP per glucose molecule

Answer:

two Question 14: The final step of the Krebs cycle is the regeneration of oxaloacetate, which is produced when NAD+ is reduced to _______

Answer:

NADH Question 15: Where do methanogens get the hydrogens involved in reducing CO2 to CH4 in anaerobic respiration?

Answer:

From organic molecules produced by other organisms Question 16: In the absence of oxygen, electrons generated by glycolysis can be donated to organic molecules to recycle NAD+ in a process called

Answer:

fermentation Question 17: What molecule enters the citric acid cycle and combines with oxaloacetate to form citric acid?

Answer:

Acetyl-CoA Question 18: Which of the following is the source of hydrogen in oxygenic photosynthesis?

Answer:

H2O

Question 19: The purpose of fermentation is to recycle which of the following?

Answer:

NAD+ Question 20: The electrons donated to the electron transport chain by NADH activate ______ proton pumps, while those donated by FADH2 activate ______ proton pumps.

Answer:

three two Question 21: _______ is the step in cellular respiration that does not appear to have changed for more than 2 billion years.

Answer:

Glycolysis

Question 22: Which of the following best describes redox reactions?

Answer:

Redox reactions involve the loss and gain of electrons.Question 23: The calculation of the P/O ratio depends on the number of binding sites for ATP on ATP synthase and the number of which of the following?

Answer:

protons required for rotation Question 24: The flow of highly energetic electrons through the electron transport chain changes the ________ of the pump proteins, which causes them to transport protons across the membrane.

Answer:

Shape

Question 25: Choose all true statements about anaerobic respiration

Answer:

Less ATP is made in anaerobic respiration compared to aerobic (cellular) respiration.

The final electron acceptor in anaerobic respiration is an inorganic molecule other than oxygen.