Question

1. There's a branching point in cellular respiration involving pyruvate. Pyruvate can undergo lactic acid fermentation or enter the mitochondria to enter the citric acid cycle. What determines what happens to pyruvate?
A. Energy demands of the cell
B. 15% concentrated power of will
C. pH of the intracellular fluid
D. Presence/absence of oxygen

In the fed state, how is glucose used in the body? Select all correct answer choices.
A. Used in glycogenesis to create glycogen in skeletal muscles and the liver
B. Converted into amino acids to create proteins
C. Converted into glycerol and fatty acid chains to be used in lipogenesis Used as a reactant in cellular respiration in all cells

Deamination is a process to create organic acids from amino acids. What intermediate of cellular respiration can they be converted into? Select all correct answer choices.
A. Pyyruvate
B. Acetyl CoA
C. Intermediate of glycolysis
D. Intermediate of the citric acid cycle

Dr. Nair hatched an evil plan to release a virus that destroys all mitochondria in all human cells. Which macromolecules can still be used to create ATP? Select all correct answer choices.
A. Fatty acids
B. Glycogen
C. Amino acids
D. Glycerol

What processes do glycerol and fatty acids get used for? Select all correct answer choices.
A. Deamination
B. Glycogenolysis
C. Cellular respiration in most cells o the body
D. Gluconeogenesis

What is oxygen used for in cellular respiration? Select all correct answer choices.
A. To accept carbon from the citric acid cycle, making CO2
B. To accept the free electrons that travel down the electron transport chain, creating H2O To accept hydrogen from NADH, refreshing NAD+, creating H2O
C. Used to decrease the H+ concentration inside mitochondria by creating H2O

Acetyl CoA is the best described as a _____________ of the citric acid cycle.
A. reactant
B. product
C. intermediate

Which molecule requires the least number of reactions to become glucose?
A. Lactate
B. Pyruvate
C. Acetyl CoA
D.Glycerol

Nairium is a new ion that Dr. Nair will release on to this pathetic world. Cower in fear! It has a charge of -2. If found in high concentrations outside the cell, how will it affect the resting membrane potential of neurons?
A. It will increase.
B. I'll start the underground movement to fight Dr. Nair's evil plans, but will lose a point in doing so.
C. It will decrease.

If we made the cell membrane impermeable to all ions, what would happen to the membrane potential of the cell?
A. Negative
B. >9000
C. Positive
D. Zero

Answer 1

1. There's a branching point in cellular respiration involving pyruvate. Pyruvate can undergo lactic acid fermentation or enter the mitochondria to enter the citric acid cycle. What determines what happens to pyruvate?
A. Energy demands of the cell - it does not determine what happens to pyruvate. So, it is incorrect.
B. 15% concentrated power of will- it is incorrect as power of will does not determine the fate of pyruvate.
C. pH of the intracellular fluid- it is incorrect as pH of intracellular fluid does not determine the fate of pyruvate.
D. Presence/absence of oxygen- it is correct as presence or absence of oxygen determines the fate of pyruvate.

If oxygen is there then pyruvate enters mitochondria and begins the kreb's cycle and if oxygen is not there then lactic acid is produced in the cytoplasm.

So, the correct answer is D.