---
title: "AP Biology Conceptual Analysis FRQ Practice"
description: "138 Conceptual Analysis questions written in the AP format, each scored part by part."
canonical: "https://fiveable.me/ap-bio/frqs/conceptual-analysis"
type: "frq-type-practice"
subject: "AP Biology"
---

# AP Biology Conceptual Analysis FRQ Practice

## What the Conceptual Analysis FRQ asks

This is FRQ 4 on the AP Biology exam. It describes a biological process and a disruption to it, and you describe the process, explain it, then predict and justify the effect of the disruption.

- **10 min**: suggested writing time
- **4 points**: 1 point for each part
- **50%**: of your score, for all six FRQs

| Part | What it asks | Points |
| --- | --- | --- |
| A: Describe | Describe the normal concept or process | 1 |
| B: Explain | Explain how or why the process works | 1 |
| C: Predict | Predict the cause or effect of the disruption | 1 |
| D: Justify | Justify the prediction with cause-and-effect reasoning | 1 |

## How Conceptual Analysis FRQ practice works

1. **Read the full question.** The scenario and all four parts, A through D, laid out the way the exam shows them.
2. **Write on a 10-minute timer.** The time to plan for on exam day. Pause it or turn it off, and your response saves as you go.
3. **Submit for a score out of 4.** Your response is scored against the scoring guidelines written for that question. Your first score is included.

## All 138 questions

### Unit 1: Chemistry of Life (16)
- [Protein folding, amino acid properties, aqueous environment](/ap-bio/frq-practice?id=6983bc18ebf1103b6c527f94&type=frq-4-conceptual-analysis-short)
- [Protein tertiary structure and thermal stability in enzymes](/ap-bio/frq-practice?id=6983bc5febf1103b6c527f96&type=frq-4-conceptual-analysis-short)
- [Aquaporin protein structure and membrane integration](/ap-bio/frq-practice?id=6983bd9bebf1103b6c527fa5&type=frq-4-conceptual-analysis-short)
- [Protein folding, hydrogen bonding, hydrophobic interactions](/ap-bio/frq-practice?id=6983bdebebf1103b6c527fa7&type=frq-4-conceptual-analysis-short)
- [Thermophilic protein stability through disulfide bonds](/ap-bio/frq-practice?id=6983be71ebf1103b6c527fac&type=frq-4-conceptual-analysis-short)
- [Protein folding in aqueous cytoplasmic environments](/ap-bio/frq-practice?id=6983bedfebf1103b6c527fb0&type=frq-4-conceptual-analysis-short)
- [Thermal stability of DNA across bacterial species](/ap-bio/frq-practice?id=6983bf29ebf1103b6c527fb5&type=frq-4-conceptual-analysis-short)
- [Protein structure: amino acids, interactions, stability](/ap-bio/frq-practice?id=6983bfe1ebf1103b6c527fbd&type=frq-4-conceptual-analysis-short)
- [Protein structure, amino acid interactions, aqueous environment](/ap-bio/frq-practice?id=6983c024ebf1103b6c527fc1&type=frq-4-conceptual-analysis-short)
- [Protein stability and thermophile adaptation mechanisms](/ap-bio/frq-practice?id=6983c10febf1103b6c527fcb&type=frq-4-conceptual-analysis-short)
- [Sickle cell disease hemoglobin mutation and protein aggregation](/ap-bio/frq-practice?id=6983c2bcebf1103b6c527fda&type=frq-4-conceptual-analysis-short)
- [Protein structure, hydrogen bonding, hydrophobic interactions](/ap-bio/frq-practice?id=6983c43eebf1103b6c527fed&type=frq-4-conceptual-analysis-short)
- [Thermophilic protein stability and amino acid interactions](/ap-bio/frq-practice?id=6983c4c2ebf1103b6c527fef&type=frq-4-conceptual-analysis-short)
- [Myoglobin protein structure and amino acid interactions](/ap-bio/frq-practice?id=6983c51cebf1103b6c527ff3&type=frq-4-conceptual-analysis-short)
- [Protein folding, hydrophobic interactions, amino acid polarity](/ap-bio/frq-practice?id=6983c569ebf1103b6c527ff7&type=frq-4-conceptual-analysis-short)
- [Protein folding and hydrophobic interactions in aqueous environments](/ap-bio/frq-practice?id=6983c5fcebf1103b6c527ffb&type=frq-4-conceptual-analysis-short)

### Unit 2: Cells (18)
- [Charged ion transport across phospholipid bilayer membranes](/ap-bio/frq-practice?id=69751c2e39cb567763bc69b9&type=frq-4-conceptual-analysis-short)
- [Phospholipid structure, bilayer formation, membrane fluidity](/ap-bio/frq-practice?id=69751cae39cb567763bc69be&type=frq-4-conceptual-analysis-short)
- [Osmotic water movement and solute retention in Paramecium](/ap-bio/frq-practice?id=6983bc3aebf1103b6c527f95&type=frq-4-conceptual-analysis-short)
- [Contractile vacuole osmoregulation in hypotonic environments](/ap-bio/frq-practice?id=6983bd1debf1103b6c527f9e&type=frq-4-conceptual-analysis-short)
- [Halophyte ion regulation in hypertonic soil environments](/ap-bio/frq-practice?id=6983be7cebf1103b6c527fad&type=frq-4-conceptual-analysis-short)
- [Osmotic adaptation in mangrove root cells](/ap-bio/frq-practice?id=6983bec6ebf1103b6c527faf&type=frq-4-conceptual-analysis-short)
- [Osmoregulation in freshwater protists](/ap-bio/frq-practice?id=6983bf06ebf1103b6c527fb3&type=frq-4-conceptual-analysis-short)
- [Osmotic regulation in single-celled organisms](/ap-bio/frq-practice?id=6983bf5febf1103b6c527fb7&type=frq-4-conceptual-analysis-short)
- [Lysosomal enzyme synthesis and intracellular trafficking pathways](/ap-bio/frq-practice?id=6983bfa7ebf1103b6c527fb9&type=frq-4-conceptual-analysis-short)
- [Osmotic regulation in hypotonic freshwater environments](/ap-bio/frq-practice?id=6983bff0ebf1103b6c527fbe&type=frq-4-conceptual-analysis-short)
- [Osmoregulation in freshwater protist cells](/ap-bio/frq-practice?id=6983c03aebf1103b6c527fc2&type=frq-4-conceptual-analysis-short)
- [Osmotic regulation in freshwater unicellular organisms](/ap-bio/frq-practice?id=6983c0f8ebf1103b6c527fca&type=frq-4-conceptual-analysis-short)
- [Protein synthesis, modification, and lysosomal sorting mechanisms](/ap-bio/frq-practice?id=6983c147ebf1103b6c527fcd&type=frq-4-conceptual-analysis-short)
- [Mangrove osmoregulation in saline environments](/ap-bio/frq-practice?id=6983c191ebf1103b6c527fd1&type=frq-4-conceptual-analysis-short)
- [Osmotic water movement in paramecium cells](/ap-bio/frq-practice?id=6983c342ebf1103b6c527fdf&type=frq-4-conceptual-analysis-short)
- [Osmotic regulation in freshwater protists](/ap-bio/frq-practice?id=6983c3d8ebf1103b6c527fe6&type=frq-4-conceptual-analysis-short)
- [Active transport of nitrate via proton gradient](/ap-bio/frq-practice?id=6983c420ebf1103b6c527feb&type=frq-4-conceptual-analysis-short)
- [Osmotic water movement in freshwater protist cells](/ap-bio/frq-practice?id=6983c477ebf1103b6c527fee&type=frq-4-conceptual-analysis-short)

### Unit 3: Cellular Energetics (20)
- [Electrochemical gradient and ATP synthesis mechanism](/ap-bio/frq-practice?id=69751ca639cb567763bc69bd&type=frq-4-conceptual-analysis-short)
- [Mitochondrial proton gradients and oxidative phosphorylation efficiency](/ap-bio/frq-practice?id=6983bbc9ebf1103b6c527f92&type=frq-4-conceptual-analysis-short)
- [Light-dependent reactions, electron transport, ATP production](/ap-bio/frq-practice?id=6983bc85ebf1103b6c527f97&type=frq-4-conceptual-analysis-short)
- [Light-dependent reactions and herbicide mechanisms](/ap-bio/frq-practice?id=6983bcc1ebf1103b6c527f9a&type=frq-4-conceptual-analysis-short)
- [Electron transport chain, coenzymes, proton gradient](/ap-bio/frq-practice?id=6983bd93ebf1103b6c527fa3&type=frq-4-conceptual-analysis-short)
- [Oxidative phosphorylation and proton gradient energy coupling](/ap-bio/frq-practice?id=6983bf09ebf1103b6c527fb4&type=frq-4-conceptual-analysis-short)
- [Lysosomal compartmentalization and acidic enzyme function](/ap-bio/frq-practice?id=6983c227ebf1103b6c527fd4&type=frq-4-conceptual-analysis-short)
- [Light-dependent reactions, Calvin cycle, photorespiration efficiency](/ap-bio/frq-practice?id=6983c240ebf1103b6c527fd6&type=frq-4-conceptual-analysis-short)
- [Brown adipose tissue thermogenesis and cellular respiration](/ap-bio/frq-practice?id=6983c2ccebf1103b6c527fdc&type=frq-4-conceptual-analysis-short)
- [Light-dependent reactions, electron transport, ATP synthesis](/ap-bio/frq-practice?id=6983c3d5ebf1103b6c527fe5&type=frq-4-conceptual-analysis-short)
- [Light-dependent reactions, electron transport, proton gradients](/ap-bio/frq-practice?id=6983c4cfebf1103b6c527ff0&type=frq-4-conceptual-analysis-short)
- [Light-dependent reactions, electron transport, ATP synthesis](/ap-bio/frq-practice?id=6983c9eeebf1103b6c52801a&type=frq-4-conceptual-analysis-short)
- [Enzyme structure, catalysis, temperature effects, glyphosate inhibition](/ap-bio/frq-practice?id=6ab29e4eef7fbc2d27b7d6f9&type=frq-4-conceptual-analysis-short)
- [Electron transport chain, oxidative phosphorylation, ATP synthesis](/ap-bio/frq-practice?id=6ab29e87ef7fbc2d27b7d717&type=frq-4-conceptual-analysis-short)
- [Phosphofructokinase allosteric regulation and metabolic efficiency](/ap-bio/frq-practice?id=6ab29ebaef7fbc2d27b7d739&type=frq-4-conceptual-analysis-short)
- [Enzyme active site specificity and substrate competition](/ap-bio/frq-practice?id=6ab29eeeef7fbc2d27b7d758&type=frq-4-conceptual-analysis-short)
- [Enzyme active site specificity and environmental pH effects](/ap-bio/frq-practice?id=6ab29f62ef7fbc2d27b7d79d&type=frq-4-conceptual-analysis-short)
- [Polyphenol oxidase enzyme activity and browning response](/ap-bio/frq-practice?id=6ab29fa1ef7fbc2d27b7d7ca&type=frq-4-conceptual-analysis-short)
- [Electron transport chain regulation in photosynthetic adaptation](/ap-bio/frq-practice?id=6ab2a021ef7fbc2d27b7d80f&type=frq-4-conceptual-analysis-short)
- [Enzyme specificity, inhibition, and metabolic regulation](/ap-bio/frq-practice?id=6ab2a05eef7fbc2d27b7d833&type=frq-4-conceptual-analysis-short)

### Unit 4: Cell Communication and Cell Cycle (14)
- [Cyclins, cell cycle regulation, growth factor signaling](/ap-bio/frq-practice?id=69751c2f39cb567763bc69ba&type=frq-4-conceptual-analysis-short)
- [Rb-E2F regulation and G1/S checkpoint control](/ap-bio/frq-practice?id=6983bd42ebf1103b6c527fa0&type=frq-4-conceptual-analysis-short)
- [Cell cycle checkpoints, p53, DNA damage response](/ap-bio/frq-practice?id=6983bdf7ebf1103b6c527fa8&type=frq-4-conceptual-analysis-short)
- [Growth factor signaling, cell cycle regulation pathways](/ap-bio/frq-practice?id=6983be45ebf1103b6c527fab&type=frq-4-conceptual-analysis-short)
- [Growth factor signaling and cell cycle checkpoint control](/ap-bio/frq-practice?id=6983be8eebf1103b6c527fae&type=frq-4-conceptual-analysis-short)
- [Cell cycle regulation through cyclins and CDK checkpoints](/ap-bio/frq-practice?id=6983c0a4ebf1103b6c527fc7&type=frq-4-conceptual-analysis-short)
- [Cell cycle checkpoints and DNA damage response mechanisms](/ap-bio/frq-practice?id=6983c285ebf1103b6c527fd9&type=frq-4-conceptual-analysis-short)
- [GPCR signaling pathway regulating intestinal fluid secretion](/ap-bio/frq-practice?id=6983c3ceebf1103b6c527fe3&type=frq-4-conceptual-analysis-short)
- [DNA replication and checkpoint regulation mechanisms](/ap-bio/frq-practice?id=6983c410ebf1103b6c527fe9&type=frq-4-conceptual-analysis-short)
- [Cyclin regulation and growth factor signal transduction](/ap-bio/frq-practice?id=6983c691ebf1103b6c528001&type=frq-4-conceptual-analysis-short)
- [Ethylene signaling and fruit ripening feedback mechanisms](/ap-bio/frq-practice?id=6ab29e4bef7fbc2d27b7d6f1&type=frq-4-conceptual-analysis-short)
- [Quorum sensing and bacterial bioluminescence regulation](/ap-bio/frq-practice?id=6ab29e7aef7fbc2d27b7d70c&type=frq-4-conceptual-analysis-short)
- [Epinephrine signal transduction and glycogen breakdown amplification](/ap-bio/frq-practice?id=6ab29f5fef7fbc2d27b7d79b&type=frq-4-conceptual-analysis-short)
- [Plant pathogen defense through systemic signaling](/ap-bio/frq-practice?id=6ab2a014ef7fbc2d27b7d808&type=frq-4-conceptual-analysis-short)

### Unit 5: Heredity (14)
- [Chromosome number changes through meiosis and nondisjunction](/ap-bio/frq-practice?id=69751c3239cb567763bc69bb&type=frq-4-conceptual-analysis-short)
- [Linked genes, crossing over, recombination frequency](/ap-bio/frq-practice?id=6983bd78ebf1103b6c527fa1&type=frq-4-conceptual-analysis-short)
- [X-chromosome inactivation and sex-linked inheritance patterns](/ap-bio/frq-practice?id=6983bef0ebf1103b6c527fb1&type=frq-4-conceptual-analysis-short)
- [Mitochondrial DNA inheritance and maternal transmission patterns](/ap-bio/frq-practice?id=6983bfb2ebf1103b6c527fba&type=frq-4-conceptual-analysis-short)
- [Mitochondrial DNA inheritance and maternal transmission patterns](/ap-bio/frq-practice?id=6983c382ebf1103b6c527fe1&type=frq-4-conceptual-analysis-short)
- [Chromosome reduction and genetic variation in meiosis](/ap-bio/frq-practice?id=6983c54aebf1103b6c527ff5&type=frq-4-conceptual-analysis-short)
- [Temperature-dependent sex determination in alligators](/ap-bio/frq-practice?id=6983c673ebf1103b6c528000&type=frq-4-conceptual-analysis-short)
- [Temperature-sensitive enzyme affecting rabbit coat pigmentation](/ap-bio/frq-practice?id=6983c717ebf1103b6c528005&type=frq-4-conceptual-analysis-short)
- [Temperature-sensitive enzyme affecting coat pigmentation](/ap-bio/frq-practice?id=6983c83debf1103b6c52800b&type=frq-4-conceptual-analysis-short)
- [Soil pH, aluminum absorption, flower color phenotype](/ap-bio/frq-practice?id=6ab29e4cef7fbc2d27b7d6f3&type=frq-4-conceptual-analysis-short)
- [Maternal inheritance of chloroplast DNA traits](/ap-bio/frq-practice?id=6ab29ed1ef7fbc2d27b7d748&type=frq-4-conceptual-analysis-short)
- [Incomplete dominance in snapdragon flower pigmentation](/ap-bio/frq-practice?id=6ab29fceef7fbc2d27b7d7e6&type=frq-4-conceptual-analysis-short)
- [Seasonal coat color changes in snowshoe hares](/ap-bio/frq-practice?id=6ab2a007ef7fbc2d27b7d802&type=frq-4-conceptual-analysis-short)
- [Sex-linked inheritance in bird feather color](/ap-bio/frq-practice?id=6ab2a05bef7fbc2d27b7d82f&type=frq-4-conceptual-analysis-short)

### Unit 6: Gene Expression and Regulation (19)
- [RNA polymerase, transcription factors, heat shock response](/ap-bio/frq-practice?id=697593b72649156a48dc1dff&type=frq-4-conceptual-analysis-short)
- [HIF-1α oxygen-dependent protein degradation pathway](/ap-bio/frq-practice?id=6983bc00ebf1103b6c527f93&type=frq-4-conceptual-analysis-short)
- [Stickleback pelvic spine development and enhancer regulation](/ap-bio/frq-practice?id=6983bce2ebf1103b6c527f9c&type=frq-4-conceptual-analysis-short)
- [Bacterial gene regulation and tryptophan synthesis control](/ap-bio/frq-practice?id=6983c005ebf1103b6c527fbf&type=frq-4-conceptual-analysis-short)
- [Alternative splicing regulation of apoptosis protein](/ap-bio/frq-practice?id=6983c05debf1103b6c527fc3&type=frq-4-conceptual-analysis-short)
- [Epigenetic regulation of stress response genes](/ap-bio/frq-practice?id=6983c172ebf1103b6c527fd0&type=frq-4-conceptual-analysis-short)
- [Galactose-responsive gene regulation in yeast](/ap-bio/frq-practice?id=6983c1c4ebf1103b6c527fd3&type=frq-4-conceptual-analysis-short)
- [Iron homeostasis and translational regulation mechanisms](/ap-bio/frq-practice?id=6983c3fbebf1103b6c527fe8&type=frq-4-conceptual-analysis-short)
- [Oxygen-responsive gene regulation and hypoxia signaling pathway](/ap-bio/frq-practice?id=6983c43bebf1103b6c527fec&type=frq-4-conceptual-analysis-short)
- [Light-regulated anthocyanin synthesis and gene expression control](/ap-bio/frq-practice?id=6983c603ebf1103b6c527ffc&type=frq-4-conceptual-analysis-short)
- [Epigenetic regulation of mammalian coat color and metabolism](/ap-bio/frq-practice?id=6983c6bdebf1103b6c528003&type=frq-4-conceptual-analysis-short)
- [Oxygen sensing and hypoxic gene expression regulation](/ap-bio/frq-practice?id=6983c73febf1103b6c528006&type=frq-4-conceptual-analysis-short)
- [Gene regulation through microRNA silencing pathway](/ap-bio/frq-practice?id=6ab29e8def7fbc2d27b7d722&type=frq-4-conceptual-analysis-short)
- [Cortisol signaling and inflammatory response regulation](/ap-bio/frq-practice?id=6ab29ef1ef7fbc2d27b7d75e&type=frq-4-conceptual-analysis-short)
- [Histone acetylation and seasonal coat color regulation](/ap-bio/frq-practice?id=6ab29ef2ef7fbc2d27b7d75f&type=frq-4-conceptual-analysis-short)
- [Phenotypic plasticity in Daphnia morphology](/ap-bio/frq-practice?id=6ab29f01ef7fbc2d27b7d76d&type=frq-4-conceptual-analysis-short)
- [DNA replication and chromosome end protection mechanisms](/ap-bio/frq-practice?id=6ab29f43ef7fbc2d27b7d78d&type=frq-4-conceptual-analysis-short)
- [CFTR protein synthesis and cystic fibrosis mutation effects](/ap-bio/frq-practice?id=6ab29fb5ef7fbc2d27b7d7d6&type=frq-4-conceptual-analysis-short)
- [Horizontal gene transfer, antibiotic resistance, bacterial transformation](/ap-bio/frq-practice?id=6ab2a034ef7fbc2d27b7d817&type=frq-4-conceptual-analysis-short)

### Unit 7: Natural Selection (18)
- [Copper tolerance, reproductive isolation, and speciation in grasses](/ap-bio/frq-practice?id=69751c4339cb567763bc69bc&type=frq-4-conceptual-analysis-short)
- [Behavioral isolation through mate preference in cichlids](/ap-bio/frq-practice?id=6983bbbbebf1103b6c527f91&type=frq-4-conceptual-analysis-short)
- [Parasitoid-driven selection for silent crickets](/ap-bio/frq-practice?id=6983be33ebf1103b6c527faa&type=frq-4-conceptual-analysis-short)
- [Exoskeleton thickness, parasitism, natural selection trade-offs](/ap-bio/frq-practice?id=6983c012ebf1103b6c527fc0&type=frq-4-conceptual-analysis-short)
- [Stickleback armor evolution in freshwater environments](/ap-bio/frq-practice?id=6983c096ebf1103b6c527fc5&type=frq-4-conceptual-analysis-short)
- [Natural selection and limb length adaptation in lizards](/ap-bio/frq-practice?id=6983c0d7ebf1103b6c527fc9&type=frq-4-conceptual-analysis-short)
- [Predation pressure and guppy population evolution](/ap-bio/frq-practice?id=6983c1a5ebf1103b6c527fd2&type=frq-4-conceptual-analysis-short)
- [Parasitic fly-driven selection in cricket populations](/ap-bio/frq-practice?id=6983c23eebf1103b6c527fd5&type=frq-4-conceptual-analysis-short)
- [Insecticide resistance evolution in mosquito populations](/ap-bio/frq-practice?id=6983c2c8ebf1103b6c527fdb&type=frq-4-conceptual-analysis-short)
- [Cliff swallow wing length evolution and traffic selection](/ap-bio/frq-practice?id=6983c3dfebf1103b6c527fe7&type=frq-4-conceptual-analysis-short)
- [Natural selection on flowering time in seasonal environments](/ap-bio/frq-practice?id=6983c420ebf1103b6c527fea&type=frq-4-conceptual-analysis-short)
- [Bacterial antibiotic resistance evolution and selection](/ap-bio/frq-practice?id=6983c4e1ebf1103b6c527ff1&type=frq-4-conceptual-analysis-short)
- [Urban mouse populations: genetic drift and adaptation](/ap-bio/frq-practice?id=6983c529ebf1103b6c527ff4&type=frq-4-conceptual-analysis-short)
- [Pesticide resistance evolution through natural selection](/ap-bio/frq-practice?id=6983c59bebf1103b6c527ff8&type=frq-4-conceptual-analysis-short)
- [Seasonal camouflage timing in changing climate conditions](/ap-bio/frq-practice?id=6ab29e8eef7fbc2d27b7d724&type=frq-4-conceptual-analysis-short)
- [Predator-prey coevolution and trade-off costs](/ap-bio/frq-practice?id=6ab29ecfef7fbc2d27b7d747&type=frq-4-conceptual-analysis-short)
- [Reproductive isolation through host-plant fruiting time differences](/ap-bio/frq-practice?id=6ab29f01ef7fbc2d27b7d770&type=frq-4-conceptual-analysis-short)
- [Reproductive isolation through pollinator-driven divergence](/ap-bio/frq-practice?id=6ab29fbfef7fbc2d27b7d7dc&type=frq-4-conceptual-analysis-short)

### Unit 8: Ecology (19)
- [Resource limitation and species coexistence in ecosystems](/ap-bio/frq-practice?id=69751ce039cb567763bc69bf&type=frq-4-conceptual-analysis-short)
- [Trophic levels and predator-prey interactions in marshes](/ap-bio/frq-practice?id=6983bc9aebf1103b6c527f98&type=frq-4-conceptual-analysis-short)
- [Eutrophication, eelgrass decline, ecosystem restoration](/ap-bio/frq-practice?id=6983bce0ebf1103b6c527f9b&type=frq-4-conceptual-analysis-short)
- [Limb length variation and environmental adaptation in lizards](/ap-bio/frq-practice?id=6983bd05ebf1103b6c527f9d&type=frq-4-conceptual-analysis-short)
- [Keystone species and trophic cascades in kelp forests](/ap-bio/frq-practice?id=6983bd97ebf1103b6c527fa4&type=frq-4-conceptual-analysis-short)
- [Phenological mismatch in predator-prey food web dynamics](/ap-bio/frq-practice?id=6983bde1ebf1103b6c527fa6&type=frq-4-conceptual-analysis-short)
- [Phenological mismatch between predator breeding and prey availability](/ap-bio/frq-practice?id=6983befdebf1103b6c527fb2&type=frq-4-conceptual-analysis-short)
- [Invasive hemlock woolly adelgid ecosystem impact](/ap-bio/frq-practice?id=6983bf52ebf1103b6c527fb6&type=frq-4-conceptual-analysis-short)
- [Invasive zebra mussels disrupting Great Lakes ecosystem](/ap-bio/frq-practice?id=6983bf96ebf1103b6c527fb8&type=frq-4-conceptual-analysis-short)
- [Phenological mismatch, trophic synchronization, reproductive fitness](/ap-bio/frq-practice?id=6983c076ebf1103b6c527fc4&type=frq-4-conceptual-analysis-short)
- [Red Land Crab's ecological role and nutrient cycling](/ap-bio/frq-practice?id=6983c0cdebf1103b6c527fc8&type=frq-4-conceptual-analysis-short)
- [Climate change disrupting mutualistic pollination timing](/ap-bio/frq-practice?id=6983c114ebf1103b6c527fcc&type=frq-4-conceptual-analysis-short)
- [Predation preventing competitive exclusion intertidal community](/ap-bio/frq-practice?id=6983c15eebf1103b6c527fcf&type=frq-4-conceptual-analysis-short)
- [Keystone predator regulating intertidal species diversity](/ap-bio/frq-practice?id=6983c278ebf1103b6c527fd7&type=frq-4-conceptual-analysis-short)
- [Keystone predators and trophic cascade effects](/ap-bio/frq-practice?id=6983c2dbebf1103b6c527fdd&type=frq-4-conceptual-analysis-short)
- [Trophic energy transfer and predator-prey dynamics](/ap-bio/frq-practice?id=6983c32cebf1103b6c527fde&type=frq-4-conceptual-analysis-short)
- [Phenological mismatch, resource availability, population dynamics](/ap-bio/frq-practice?id=6983c388ebf1103b6c527fe2&type=frq-4-conceptual-analysis-short)
- [Keystone predator maintaining intertidal species diversity](/ap-bio/frq-practice?id=6983c3d3ebf1103b6c527fe4&type=frq-4-conceptual-analysis-short)
- [Coral-algae symbiosis, thermal stress adaptation, phenotypic variation](/ap-bio/frq-practice?id=6ab29f82ef7fbc2d27b7d7b2&type=frq-4-conceptual-analysis-short)

## Sample question

**Protein folding, amino acid properties, aqueous environment**

Proteins are essential macromolecules that perform a wide range of functions in living organisms, including catalysis, transport, and structural support. The function of a protein is intimately linked to its specific three-dimensional shape, or tertiary structure. This structure is determined by the sequence of amino acids in the polypeptide chain and is maintained by various chemical interactions.

Most biologically active proteins, such as enzymes, exist in the aqueous environment of the cell cytoplasm. The folding of a polypeptide into its functional globular shape is driven by the chemical properties of the amino acid monomers and their interactions with the surrounding water molecules. The twenty different amino acids found in proteins share a common backbone but differ in their side chains, known as R-groups.

Part A (1 point):
  Prompt: **Describe** the chemical property of the R-groups (side chains) of amino acids that are typically found on the exterior surface of a cytoplasmic protein.
  Verb: describe

Part B (1 point):
  Prompt: **Explain** how the polarity of water molecules influences the final three-dimensional folding of a polypeptide chain in an aqueous environment.
  Verb: explain

Context Before Part C: Researchers are studying a specific globular protein found in the cytoplasm of bacteria. They identify a mutation in the gene encoding this protein that leads to a single amino acid substitution. In the mutant protein, a serine residue located on the exterior surface of the protein is replaced by a phenylalanine residue. Serine has a polar R-group capable of forming hydrogen bonds, while phenylalanine has a nonpolar, hydrophobic R-group.

Part C (1 point):
  Prompt: **Predict** the effect of the serine-to-phenylalanine substitution on the solubility or stability of the mutant protein in the cytoplasm.
  Verb: predict

Part D (1 point):
  Prompt: **Justify** your prediction in part C.
  Verb: justify

## Questions

**How many responses can I get scored?**

You can read every question without a plan. Your first scored response is included. A plan unlocks unlimited scoring.

**What kinds of disruptions come up?**

Mutations, environmental changes, disease states, or a missing component. You trace the effect from molecules to cells and up to organisms or ecosystems.

**How is “explain” different from “describe”?**

Describe asks what happens. Explain asks how or why, with a mechanism. Each earns its point for a different move.

**How long should each part be?**

Two to four focused sentences usually does it. Each part is worth 1 point, so answer every part.

## Related

- [Conceptual Analysis FRQ exam guide](/ap-bio/ap-biology-exam/ap-bio-frq-short/study-guide/ap-bio-frq-short)
- [AP Biology Experimental Results FRQ practice](/ap-bio/frqs/experimental-results)
- [AP Biology Graphing FRQ practice](/ap-bio/frqs/graphing)
- [AP Biology Scientific Investigation FRQ practice](/ap-bio/frqs/scientific-investigation)
- [AP Biology Model Analysis FRQ practice](/ap-bio/frqs/model-analysis)
- [AP Biology Data Analysis FRQ practice](/ap-bio/frqs/data-analysis)
- [AP Biology FRQs](/ap-bio/frqs)
- Any question by id: the `get_frq` tool on the [Fiveable MCP server](/mcp/docs)

## About This Document

Canonical Fiveable pages are available as Markdown at the same path plus `.md`.

- [llms.txt](https://fiveable.me/llms.txt): index of Fiveable's sections and URL patterns
- [llms-full.txt](https://fiveable.me/llms-full.txt): complete subject and unit listing
- [MCP server](https://fiveable.me/mcp): call Fiveable as tools instead of fetching pages (`https://fiveable.me/api/mcp`)
- [MCP server for AP teachers](https://fiveable.me/mcp/teachers): a teacher's classes, assignments and AP-rubric grading (`https://fiveable.me/api/mcp/teacher`)