Hi everyone!

Here’s a concrete MCAT tip that fixes a common failure point with biochemical pathways. Most students study pathways horizontally (step one leads to step two leads to step three)

When you study a pathway, anchor it around control points.

Every major metabolic pathway has steps that matter way more than the rest. They are irreversible, regulated, and tied to energy or redox state.

If you can identify those, you can answer most pathway questions without memorizing every intermediate.

Step one: mark the committed step

Ask, where does this pathway become locked in? Once past this point, substrates are no longer easily diverted.

Step two: link regulation to cellular state

Is the pathway upregulated by high ATP or low ATP? High NADH or high NAD+? Fed state or fasted state? The MCAT almost always frames questions around these conditions.

Step three: predict direction

For example, if ATP is high, glycolysis slows down. If NADH accumulates, the TCA cycle backs up. You don’t need to recall every enzyme.

Action you can take today:

Pick one pathway and write a single sentence that answers this question. When does the cell want this pathway on, and what signal turns it off? Then test yourself with practice questions and see how many answers you can eliminate using that logic.

If you want structure, accountability, and a clear path forward, book a free consultation call with us below!

—

Om Patel

Founder and CEO @ MCAT Edge

[email protected]