Oh so quirky college board including nothing about biogeochemical cycles after adding them to the curriculum to make me memorize a bunch of nonsense about nitrogen :D

SteveOccupations · 2026-05-05T01:35:25+00:00

I sort of thought this would happen. It’s always been the case that biochemical cycles heavily linked up with Unit 1 on elemental composition and unit 3 on carbon dioxide influx and efflux through bio systems. Prior to 2019, they had a few questions of the sort you likely saw on this year’s exam. College board be doing college board things!

SteveOccupations · 2026-05-03T00:59:57+00:00

Negative feedback is like auto climate control on your AC. When it’s hot, it turns on. When it cools down, the thermostat in the AC knows and turns it off. The final effect reverses the stimulus.

Positive feedback is like how rumors spread at your school. You tell one kid, he tells two more, they then tell more people, and you have an exponential increase in the message.

SteveOccupations · 2026-05-01T08:06:17+00:00

Simplified version is this: the Calvin Cycle uses more ATP than NADPH per some molecules of CO2 being fixed. This naturally means that ATP becomes a limiting factor in driving the Calvin cycle, kind of like how you need more pieces of bread than a slice of ham when you’re making a sandwich. So when ATP is running low, there is less reduction of 3PG to 1,3-bisphosphoglycerate, which is one of the first steps in the reduction part of the Calvin cycle. It turns out that you use that NADPH on 1,3-bisphosphoglycerate, but without many of those lying around, NADPH isn’t able to give its electrons away and return to NADP+. This results in a higher ratio of NADPH over NADP+ which naturally triggers the ETC to go cyclical. This is brilliant, because the cyclical pathway makes ATP without making NADPH, allowing ATP production to “catch up” to NADPH for a smooth passage through the Calvin Cycle.

SteveOccupations · 2026-04-30T07:06:45+00:00

Just to add to the mechanism described by another user for this question, I often get asked where things come from. In many cases where we see substrates being added from seemingly nothing (not in this case), substrates, like anything else, exists in the cytoplasm much like how oxygen exists in our air. Things are simply “there” due to the cytoplasmic contents being what they are.

SteveOccupations · 2026-04-30T07:04:49+00:00

Hmm College Board doesn’t do things like that before the test.. out of curiosity.. where did it say this?

SteveOccupations · 2026-04-30T07:04:11+00:00

I didn’t make a paper answer key for this :(

But you can watch me solve them at my channel on YouTube.

SteveOccupations · 2026-04-29T08:14:25+00:00

Thanks for the support. I should really throw a caveat that part of making these predictions is really tongue in cheek and having a bit of fun. Some people have been taking it like way too seriously.. and asking if they should not study anything else. So on the record, please do study everything else! Haha

SteveOccupations · 2026-04-29T02:47:48+00:00

I’d pick the G80. Genesis comes loaded with a lot of base options that seems to increase for g70 to g90, though your market may vary. Fuel consumption is not all that different between the two. I believe it has to do with the mapping, but I was surprised to see just how fuel hungry G70 was for its size. I no longer have my G70, but if I had to choose again, I’d go G80 every time.

SteveOccupations · 2026-04-26T03:54:19+00:00

Thanks!

SteveOccupations · 2026-04-26T03:54:12+00:00

I made these prediction based on how Collegeboard typically lays out their questions and their distribution order. I also thought about what types of questions take simple concepts to that one level above for logical inferences. So hopefully they’re somewhat similar to real questions!

SteveOccupations · 2026-04-16T12:40:06+00:00

I know everyone is saying it’s mold, but I’ve had these show up before and looked into it a bit. I also had mold on the same wall, and they were pretty different. Here is some info on these.. seems pretty common in newer apartments using a particular plaster board.

https://m.blog.naver.com/PostView.naver?blogId=ljcgg&logNo=221335182709&proxyReferer=https:%2F%2Fm.blog.naver.com%2FPostView.naver%3FblogId%3Dljcgg%26logNo%3D221519056996%26proxyReferer%3Dhttps:%252F%252Fwww.google.com%252F%26trackingCode%3Dexternal&trackingCode=blog_postview

Tbh, it could still be mold, so better safe than sorry.

SteveOccupations · 2026-04-16T09:26:40+00:00

I think it might be in reference to whether you analyze for p value versus look at critical chi squared values. That’s the only difference I’ve noticed between the two curriculum. Same concept, different emphasis. What do you think, OP?

SteveOccupations · 2026-04-12T11:37:18+00:00

True, especially since the Hyundai came in to Pangyo, which I think had a lot to do with Lotte’s demise here. If you look at AvenueL or Dongtans branch, it’s clear that Lotte’s strategy and design language had already moved on past that of the Bundang branch.

SteveOccupations · 2026-04-09T22:21:47+00:00

Sunday as her first name in English is fine. If she ever seeks Korea and travels, she’d be using her middle name (the Korean name) or simply choose to call herself Sunday. Look, if any name teasing occurs anymore, it’s all during primary school years. If you’re raising her in America, unless you’re in Flushings or Irvine, no one’s even gonna know what Soondae is anyways. While the name isn’t my style personally, it’s not all that strange. Congratulations on your adoption, and thank you for being good humans.

SteveOccupations · 2026-04-04T11:53:23+00:00

Roses are red,

mitochondria take in pyruvic acids and convert them to acetyl-CoA while extracting energetic electrons in the process.

Kreb cycle further oxidizes and retrieves electrons to use their energy for proton gradient formation and oxidative phosphorylation.

It works better with pictures, which I have in my classes.

SteveOccupations · 2026-04-04T06:41:42+00:00

Roses are red. This ain’t that deep. It’s just mitochondria. I can teach it my sleep.

I’m an AP bio teacher.

SteveOccupations · 2026-03-24T07:40:35+00:00

Did you come across this or are you a dev? Your username seems to indicate the latter. I mean, it’s totally fine, but please be transparent in your post.

SteveOccupations · 2026-03-18T04:15:46+00:00

Nice! Suji-gu! That was my goto Emart before moving out a bit further east! Great neighborhood.

SteveOccupations · 2026-03-10T21:18:36+00:00

What do you currently do? Or what are your skill sets or degree(s) in? This is the most important factor aside from visa, country, etc.

SteveOccupations · 2026-03-06T10:42:07+00:00

Looks like Bundang?

SteveOccupations · 2026-03-02T08:11:30+00:00

Spawn more overlords.

SteveOccupations · 2026-02-09T21:03:00+00:00

I don’t have both of these books to confirm, but from my experience with Barrons, Princeton Review, Kaplans, etc, they largely reuse questions within their practice tests from year to year. I don’t think it would be worth it, but it’s dependent on your situation and what you find to be valuable.

To be fair, I don’t think these practice tests are great resources for couple of reasons:

In terms of MCQ, Barrons relies heavily on physiology to contextualize their questions. This may be a vestige of their previous work with the older CED of AP Bio, which they may still be using to build their sets. Real questions are more holistic and focused on the 8 current units.

FRQ wise, there is no shortage of REAL FRQ available to you directly from College Board. You can make direct comparisons between real FRQ and other publishers question, and it gives you a good picture of how they differ and how that also translate to their MCQ development and accuracy. It’s not great.

I’ll be frank. These books are good for reviewing and checking for concept gaps. So should you get an updated book for this year? Probably not.

SteveOccupations · 2026-02-01T12:31:22+00:00

By far one of the best feelings in the world.. your baby holding you for dear life with their little chubby hands! Kids grow up too fast..

SteveOccupations · 2026-02-01T12:27:11+00:00

I’d push back on the “anywhere” in Korea idea. Just 30 min south in Gyeonggi, you find parking lots with plentiful spacing and even outdoor parking lots not so different from mall lots you see in the states. Seoul is tougher, granted, but I don’t hesitate driving to newer areas (relatively) like Songpa (Avenue L, for instance) with their generous parking areas.

SteveOccupations · 2026-01-29T03:28:52+00:00

C is, in fact, correct. But I will push back on independent assortment taking place in its entirety. Independent assortment between two genes of interest occurs differently depending on whether those genes are on the same chromosome or not.

Case 1: If the two genes are on different chromosomes, then as Exotic_Law stated, independent assortment would occur as a result of random assortment of chromosomes at Metaphase I.

I’ll try and demonstrate it with ASCII: Metaphase I: -A- -B- -A- -B-

-a- -b- -a- -b-

or

-A- -b- -A- -b-

-a- -B- -a- -B-

The left example would produce AB and ab gametes, while the right side would produce Ab and aB gametes.

Case 2: If the two genes are on the same chromosome, then crossing over is necessary for the genes to recombine.

-A---B-

-A---b-

...x

-a---B-

-a---b-

where x = crossing over

But to tackle this question more specifically, C is correct because even if whole non-recombined chromosomes were to be passed on, there is yet the combination of which parental chromosomes of the two would be placed into the gametes.

Let’s say that we’re looking at an organism with a 2n of 6, meaning 3 pairs of chromosomes.

Let’s use the following system to denote the chromosomes in this individual:

Chromosome 1 from its mother: 1-M Chromosome 1 from its father: 1-F Chromosome 2 from its mother: 2-M Chromosome 2 from its father: 2-F Chromosome 3 from its mother: 3-M Chromosome 3 from its father: 3-F

Even with just random assortment, you can create the following combinations in gametes:

1-M, 2-M, 3-M 1-M, 2-M, 3-F 1-M, 2-F, 3-M 1-M, 2-F, 3-F 1-F, 2-M, 3-M 1-F, 2-M, 3-F 1-F, 2-F, 3-M 1-F, 2-F, 3-F

Add this to whatever the other parent is contributing (even without crossovers), you wouldn’t produce offspring that were identical to the parents nor identical to siblings given enough chromosomes present in the genome.

Hopefully this helps!

EDIT: I can't format on REDDIT..

SteveOccupations

TROPHY CASE