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Explore TOEFL iBT DrillsAceThePrepTrap ForensicsTOEFL iBTHub →
TOEFL iBTListeningDetail Identification
Level 3 Trap Drill
Can you avoid the examiner's trap?Select an option to evaluate
Audio Transcript Excerpt: PROFESSOR: 'In avian migratory navigation, European robins (*Erithacus rubecula*) utilize an inclination compass that detects the angle of the Earth's geomagnetic field lines relative to the horizon, rather than detecting geographic north or south directly. Crucially, biophysical experiments in the early 2000s demonstrated that this magnetoreception mechanism is light-dependent: it requires photo-excitation of cryptochrome-4 (Cry4) flavoproteins located within retinal photoreceptor cells. When blue photons strike Cry4, an electron transfers along a triad of tryptophan residues, forming a magnetically sensitive radical pair with quantum spin states that oscillate in response to weak geomagnetic field fluctuations.'
According to the professor, what specific wavelength of light is required to activate cryptochrome-4 for avian magnetic sensing?
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More Detail Identification Questions in TOEFL iBT

Tier 2TOEFL iBT

Audio Transcript Excerpt: PROFESSOR: 'Deep-sea hydrothermal vents represent some of the most extreme environme...

Inspect distractor trap
Tier 3TOEFL iBT

Audio Transcript Excerpt: PROFESSOR: 'In dendroclimatology, researchers analyze annual tree-ring widths to rec...

Inspect distractor trap
Tier 2TOEFL iBT

Audio Transcript Excerpt: PROFESSOR: 'To comprehend Mesoamerican agricultural sustainability, we must analyze ...

Inspect distractor trap
Tier 2TOEFL iBT

Audio Transcript Excerpt: STUDENT: 'Hi, I need to pick up my student ID card. I submitted my photo online last...

Inspect distractor trap
Tier 3TOEFL iBT

Audio Transcript Excerpt: PROFESSOR: 'In materials engineering, the brittle-to-ductile transition in body-cent...

Inspect distractor trap