Question at position 15 Which of these characteristics are innate?Receptors are encoded in the germ lineAll of the answers are innate characteristics.Found in all multicellular plants and animalsNone of the answers are innate characteristics.Recognizes broad classes of pathogens

Question

BlackTom AI · Accepted Answer

Innate immunity is genetically encoded and broadly conserved, so the best choice is that all listed features are innate characteristics.

1) Relevant knowledge points and concepts
- Innate immunity provides immediate, non‑specific defense against pathogens and is present across multicellular life.
- Pattern recognition receptors (PRRs) such as Toll‑like receptors (TLRs), NOD‑like receptors (NLRs) and lectins are encoded in the germ line (no somatic gene rearrangement).
- Innate receptors recognize conserved pathogen-associated molecular patterns (PAMPs) or damage-associated molecular patterns (DAMPs), i.e., broad classes of pathogens rather than unique antigenic epitopes.
- Plants and invertebrates rely solely on innate immune mechanisms; vertebrates have both innate and adaptive immunity.

2) Step‑by‑step reasoning
- Examine “Receptors are encoded in the germ line”: True for innate PRRs (contrast with adaptive receptors like antibodies/T‑cell receptors that are produced by somatic recombination).
- Examine “Found in all multicellular plants and animals”: True — innate defenses exist in plants, invertebrates and vertebrates; many organisms lack adaptive immunity but have innate systems.
- Examine “Recognizes broad classes of pathogens”: True — PRRs detect conserved molecular patterns shared across groups of microbes (e.g., LPS, flagellin, fungal β‑glucans).
- Since each of these statements correctly describes innate immunity, the option stating “All of the answers are innate characteristics” logically follows.

3) Why the correct answer is correct
Each individual statement is a hallmark of innate immunity: germline‑encoded PRRs, conservation across multicellular life, and recognition of broad pathogen classes. Therefore the aggregate statement that all are innate characteristics is correct.

4) Why the other options are incorrect (brief)
- Choosing any single true statement is incomplete.  
- “None of the answers are innate characteristics” is false because several statements accurately describe innate immunity.

Conclusion: The correct answer is “All of the answers are innate characteristics,” matching the provided answer.

Question at position 15 Which of these characteristics are innate?Receptors are encoded in the germ lineAll of the answers are innate characteristics.Found in all multicellular plants and animalsNone of the answers are innate characteristics.Recognizes broad classes of pathogens单项选择题

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