A) Vivipary B) Somatic embryogenesis C) Stratification D) Imbibition E) Seed-coa

Question

A) Vivipary B) Somatic embryogenesis C) Stratification D) Imbibition E) Seed-coat imposed germination 34) In several hormone signal transduction cascades, proteins are marked for degradation by the 26S proteasome. The protein complex that marks the protein is more-or-less the same in each pathway, except for the component that determines specificity. The subunit that determines specificity for a particular hormone signaling pathway is called the A) Hormone B) S-PHASE KINASE-ASSOCIATED PROTEINI (Skpl)/cullin complex C) F-box D) Type-A Response regulator E) Transcription factor Photomorphogenic responses to far red light are mediated predominantly by D) Cryptochrome 35) B) Chrlorophyll A) Rubisco 36) C) Phytochrome E) Anthocyanin Which of the following is most true of the phytochrome system A)-phytochrome System, was one of the original hip-hop / death-metal fusion bands of the late 1990's that, after a well-received debut album, imploded from artistic differences and excessive use of secondary metabolites B) Pr (the inactive form) is converted to Pfr (the active form) by far red light C) Pr (the inactive form) is converted to Pfr (the active form) by red light D) Pr (the active form) is converted to Pfr (the inactive form) by far red light E) Pr (the active form) is converted to Pfr (the inactive form) by red light Under which of the following conditions would the red:far-red ratio of ambient light be the l A) In the middle of the day when there are no clouds B) Close to sunset, when the sky is alight with an orange glow 37) C) At night, when the only light available is from the moon and stars D) On the forest floor, under the canopy of larger plants E) During the day when the sun is blocked by clouds 38) Why do small seeds commonly need "high quality" light exposure to germinate? quality" light mean from a plants perspective. (2 pts)? 39) With respect to phytochrome activated responses in plants, very low fluence responses (VLFR) are not reversible by far red light because A) Pfr is never fully converted to Pr B) Pr is never fully converted to Pfr C) They are activated by far red light D) They are inactivated by red light E) They are activated by blue light What is true of blue light receptors (choose all that are true) A) Plants growing toward directional light is primarily a response to blue light B) Blue light can trigger stomata to open faster and larger than red light alone C) Blue light is involved in the photo-reversibility of germination in lettuce seeds D) Blue light triggers chloroplast movements when light intensity becomes strong E) They are activated by blue wavelengths and inactivated by UV wavelengths F) Phototropin blue light receptor shuttles in and out of the nucleus 40)

Explanation / Answer

34. Option C is correct.
F-box domain is responsible for protein degradation.

35. Option C is correct.
Phytochrome is responsible for sensing red light.

36. Option C is correct.
Pr (Inactive) ----(red light)---> Pfr (Active)
Pfr (Active) ----(far-red light)---> Pr (Inactive)

37. Option B is correct.
The red:far-red ratio of ambient light would be the lowest at sunset.

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