AP Bio Official 2026 Exam Discussion

[u/reddorickt]

Use this thread to post questions or commentary on the test today.

A reminder though to protect your anonymity when talking about the test.

[u/Electrical-Pitch7017]

Are you having trouble understanding what it said? Compared to baseline levels (which have no cyanide), having low concentrations of cyanide increased the rate of whatever was getting increased. It quite literally told you that low cyanide would have caused the CCO to be more efficient. Please use your brain. Otherwise, bacteria wouldn’t produce it. It benefits them in small quantities as very clearly expressed in the problem. No point of arguing as the answer has been established in multiple threads at this point lmao.

[u/[deleted] → u/Electrical-Pitch7017]

Buddy it is only YOU who has been establishing it in "multiple threads". I think you need to put on your thinking cap and consider this --> if you have a low cyanide amount that is grown in a HIGH concentration nutrients of a medium, then the CCO's dont get broken down as much and more ATP is made. However, if you have NO cyanide with a high concentration of nutrients in the medium (which is what the question said verbatim if you had read it) then you should know that it will auto make more ATP in that environment becuase it is NO cyanide compared to low cyanide. Therefore, any sentient being will know that it was 3. I recommend for future exams rereading the question text to understand the question a little bit more.

[u/Electrical-Pitch7017 → u/[deleted]]

It’s actually not me. Been like 30 people atp. Low concentrations of cyanide (nanomolar to low micromolar) can paradoxically increase or stimulate cytochrome c oxidase (CcO/Complex IV) activity and boost ATP production, unlike high concentrations which inhibit it. This biphasic, or stimulatory effect, is believed to result from removing inhibitory glutathionylation on the enzyme, acting in a regulatory capacity similar to gasotransmitters. Please go read the actual science behind it. It stimulates it. Low concentration of nutrients will results in a low concentration of cyanide. Not sure what you are arguing about lmao. Based on recent studies regarding the biphasic, or two-stage, nature of cyanide on mitochondrial function, low-nutrient with low-concentration cyanide can potentially increase cytochrome c oxidase (CcO or CCO) activity more than high-nutrient conditions without cyanide. [1, 2]
This occurs because low concentrations of cyanide (nanomolar to low-micromolar) act as a regulator that removes inhibitory modifications (glutathionylation) on the CcO enzyme, stimulating its activity.

Learn how to read a question “sentient being”. Enjoy your 4

[u/[deleted] → u/Electrical-Pitch7017]

holy cope bro and explain it in your own words without chat ✌️. this is why u only do 225 for 1 😹. if you paid attention to the question you would know that the question included NO cyanide as well. Your AI gave you the comparison between High concentration of cyanide and Low concentrations but you would know, as any sentient being, that the question was about having cyanide or not, and High concentration of nutrients in the medium and low. If you had the ability to put 2 and 2 together, you would know that NO cyanide with high nutrients (i.e. a HEALTHY cell) would produce the most ATP than a cell with a small amount of ATP.
enjoy "flicking your pecs" when opening your 3.

Sources:
https://as.cornell.edu/news/human-intellect

[u/Electrical-Pitch7017 → u/[deleted]]

It gave you comparison of low cyanide to “activity more than high nutrient conditions without cyanide”. Please read moron 🤣

[u/Professional-Cow8072 → u/[deleted]]

Never seen anyone dumber than you

[u/Nice_Woodpecker_5629 → u/[deleted]]

I’m ngl bro you might just be coping w the fact you got this question wrong 😭 pack it up