AP Biology: Donor Source Pathogen-Transfer Risk Practice Questions
Practice evaluating disease risks when organisms or seeds are moved among climate refugia. These original AP Biology questions connect pathogen carriage, quarantine screening, host range, asymptomatic infection, source-mixing risk, and post-release monitoring to ecological restoration without assuming that a negative screen eliminates every risk.
Free original practice questions for study purposes. Open Exam Prep is an independent study resource and is not affiliated with, endorsed by, or sponsored by the makers of AP Exams.
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Answer the questions below — you get instant feedback and a full explanation for each.
1. What does pathogen carriage mean when a restoration team moves seeds from a donor population?
Explanation. Pathogen carriage occurs when moved biological material carries a pathogen or contaminated tissue. Visible health alone cannot rule it out because pathogen abundance and symptoms can vary.
2. Which quarantine screening design gives the strongest evidence before a donor seed lot is released?
Explanation. Representative sampling, complementary tests, and temporary isolation make quarantine screening more likely to detect contamination before material enters a recipient network.
3. Why is a pathogen's host range relevant when choosing among donor populations?
Explanation. Host range is the set of host species a pathogen can infect. A broader range can create more transmission pathways and ecological consequences in a diverse recipient community.
4. A donor plant appears healthy but repeatedly tests positive for a fungal pathogen. Which interpretation is best?
Explanation. An asymptomatic infection is present without obvious symptoms. Such hosts can still carry and sometimes transmit a pathogen, so appearance should not replace screening evidence.
5. Why can combining untested material from several donor populations increase source-mixing risk?
Explanation. Source-mixing risk includes new contact among biological materials and reduced traceability. Keeping lots identifiable supports containment and investigation if a pathogen is detected.
6. Which post-release monitoring plan is most likely to detect an introduced disease early?
Explanation. Repeated, spatially structured post-release monitoring can detect changes through time and around release points. Confirmatory testing reduces errors from symptoms that have other causes.
7. A screening test has imperfect sensitivity. What follows from one negative result on a large donor lot?
Explanation. Imperfect sensitivity creates false negatives. Multiple representative samples improve detection probability, but a negative result is evidence rather than proof of zero pathogen presence.
8. Which field-trial layout best helps distinguish an introduced pathogen effect from background disease?
Explanation. Baselines, reference plots, replication, and consistent observation help separate changes associated with the release from natural spatial and temporal variation in disease.
9. How can a seed-dispersal kernel help plan disease surveillance after release?
Explanation. A dispersal kernel estimates movement probability over distance. Surveillance can emphasize likely deposition areas while accounting for rare long-distance events and other transmission routes.
10. A pathogen infects the donor species and two abundant native species at the recipient site. What is the most defensible implication?
Explanation. Multiple compatible hosts can maintain or amplify transmission. Risk evaluation should consider community interactions rather than measuring only the moved species.
11. Which preplanned response threshold best supports adaptive management after a donor release?
Explanation. A threshold defined before outcomes are known connects post-release monitoring to a transparent action. Comparison with baseline and references reduces overreaction to ordinary background disease.
12. Two donor lots pass initial screening, but one has no traceable collection records. Which conclusion is most appropriate?
Explanation. Traceable records do not prevent disease, but they support source investigation, targeted containment, and comparison among batches. Missing records therefore weaken risk management even after a negative screen.
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FAQ
Can a healthy-looking donor still carry a pathogen?
Yes. An infection may be asymptomatic, below a test's detection limit, or present in associated soil or plant material, so visual inspection is only one part of screening.
Why keep donor seed lots separate and traceable?
Separation limits source-mixing risk and allows a later detection to be linked to a particular collection, handling step, or batch for targeted investigation.
What should post-release disease monitoring include?
Use baseline data, marked release and reference plots, repeated surveys of the donor and other potential hosts, confirmatory tests, and preplanned thresholds for pausing or adapting releases.