UCSD: BIMM 116 Final Exam
Vocabulary Review questions and
correct answers
Photoperiod - correct answer ✔✔ Predictable changes in day length due to changes in seasons
(main way that plants use to flower)
In plants, what is more important? How much light is perceived or when this light is perceived? -
correct answer ✔✔ When this light is perceived
External Coincidence Model - correct answer ✔✔ Internal plant factors and external factors,
such as light, coincide simultaneously to induce flowering (only in long-day plants)
FT - correct answer ✔✔ - Flowering Locus T
- Key signal protein, triggers flowering after reaching threshold
- Peaks in late afternoon
Co - correct answer ✔✔ - Constans
- Positive regulator for FT
- Peaks in late afternoon
- Requires light stabilization to remain high
CDF - correct answer ✔✔ - Cycling Dof Factors
- Negative regulator for CO
- Peaks in morning, trough in late afternoon
- Circadian clock decreases levels regardless of FKF1-GI
, FKF1-GI Complex - correct answer ✔✔ - Directly regulated by clock
- Both peak in late afternoon to dimerize and degrade CDFs (during long days)
- Synchronized during long days, desynchronized during short days and cannot dimerize (GI
peaks first)
- Complex can only form with blue light since FKF1 is a blue light receptor
Toc1 - correct answer ✔✔ - Timing of Cab
- First plant clock mutant (loss of function)
- Mutant has short period, early flowering
- Mutant affected leaf-movement and Cab expression
- Overexpression leads to arrhythmia
- mRNA peaks in late afternoon/evening, stops CCA1/LHY expression through TTFL
Cab - correct answer ✔✔ - A photosynthesis gene
CCA1 - correct answer ✔✔ - Circadian Clock Associated 1
- Affects regulation of Cab by a photoreceptor
- Same gene family as LHY (redundancy)
- Peak in early morning
- Mutant of this or LHY causes short period by 2-3 hours
- Mutant of both causes arrhythmia
- Overexpression of either causes arrhythmia
LHY - correct answer ✔✔ - Late Elongated Hypocotyl
- Developmental mutant, late flowering
Vocabulary Review questions and
correct answers
Photoperiod - correct answer ✔✔ Predictable changes in day length due to changes in seasons
(main way that plants use to flower)
In plants, what is more important? How much light is perceived or when this light is perceived? -
correct answer ✔✔ When this light is perceived
External Coincidence Model - correct answer ✔✔ Internal plant factors and external factors,
such as light, coincide simultaneously to induce flowering (only in long-day plants)
FT - correct answer ✔✔ - Flowering Locus T
- Key signal protein, triggers flowering after reaching threshold
- Peaks in late afternoon
Co - correct answer ✔✔ - Constans
- Positive regulator for FT
- Peaks in late afternoon
- Requires light stabilization to remain high
CDF - correct answer ✔✔ - Cycling Dof Factors
- Negative regulator for CO
- Peaks in morning, trough in late afternoon
- Circadian clock decreases levels regardless of FKF1-GI
, FKF1-GI Complex - correct answer ✔✔ - Directly regulated by clock
- Both peak in late afternoon to dimerize and degrade CDFs (during long days)
- Synchronized during long days, desynchronized during short days and cannot dimerize (GI
peaks first)
- Complex can only form with blue light since FKF1 is a blue light receptor
Toc1 - correct answer ✔✔ - Timing of Cab
- First plant clock mutant (loss of function)
- Mutant has short period, early flowering
- Mutant affected leaf-movement and Cab expression
- Overexpression leads to arrhythmia
- mRNA peaks in late afternoon/evening, stops CCA1/LHY expression through TTFL
Cab - correct answer ✔✔ - A photosynthesis gene
CCA1 - correct answer ✔✔ - Circadian Clock Associated 1
- Affects regulation of Cab by a photoreceptor
- Same gene family as LHY (redundancy)
- Peak in early morning
- Mutant of this or LHY causes short period by 2-3 hours
- Mutant of both causes arrhythmia
- Overexpression of either causes arrhythmia
LHY - correct answer ✔✔ - Late Elongated Hypocotyl
- Developmental mutant, late flowering
