medium · MCAT bio-biochem
During a period of heavy exercise, Phosphofructokinase-1 (PFK-1) activity increases in muscle cells.
Which of the following metabolic signals most likely accounts for this activation, and what is the downstream fate of the resulting pyruvate if oxygen delivery is insufficient?
- High Citrate levels; oxidation in the Citric Acid Cycle.
- High AMP levels; reduction to lactate in the cytoplasm.
- High Glucagon levels; conversion to Glucose via gluconeogenesis.
- High ATP levels; conversion to Acetyl-CoA in the mitochondria.
Sign up free to see the explanation and track your rank →
More MCAT bio-biochem practice
- What genetic term describes a single gene influencing multiple seemingly unrelated traits?
- In the human ear, sound waves cause fluid in the cochlea to… — Which cells are responsible
- An electrophysiologist observes a neuron at its resting memb… — Which ion is primarily res
- A researcher discovers that a population of bacteria survives exposure to an antibiotic be
- Which structure is most likely dysfunctional?
- Which organelle would you expect to be exceptionally well-developed in these cells?
- Which molecule acts as a 'fluidity buffer' in animal cell membranes?
- A scientist is tracking the movement of a secreted protein. If the protein has just left t