EVOLUTION CONNECTION Photorespiration can decreasesoybeans’ photosynthetic output by about 50%. Would youexpect this figure to be higher or lower in wild relatives ofsoybeans? Why?
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EVOLUTION CONNECTION Photorespiration can decrease
soybeans’ photosynthetic output by about 50%. Would you
expect this figure to be higher or lower in wild relatives of
soybeans? Why?
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- The substance dichlorophenyldimethylurea (DCMU) is an herbicide thatinhibits photosynthesis by blocking electron transfer between plastoquinonesin photosystem II.(a) Would you expect DCMU to interfere with cyclic photophosphorylation?(b) Normally, DCMU blocks O2 evolution, but addition of ferricyanide tochloroplasts allows O2 evolution in the presence of DCMU. Explain.lides chrome extension://bpmcpldpdmajfigpchkicefoigmkfalc/views/app.html ent.docx BIU A 1. Of the following characteristics of plants, which are inherited (shared with green alg are new (evolved within the plant lineage only)? a) Multicellular sporangia b) Presence of chloroplasts c) Sessile (doesn't move) d) Embryos supported by parents e) Apical meristems f) Cellulose cell walls 2. Designate each of the following as haploid or diploid. a) Green part of a moss b) Liverwort spem c) Fern sporophy te d) Cells making up the antherid ium of a fem gameto phyte e) Plant spore f) Plant embryo 3. Fill in the blank: a) A plant spore grows into a b) Eggs are produced inside c) A plant zygote grows in to a d) Sporangia produce 4. What group of plants (bryophy tes. lycophytes, pteridophytes/ferns, seed plants/spermatop vascular plants/tracheophytes, plants/embryophy tes) is being described? Choose the group best fits the description. a) Can produce lignin-reinforced tissues (e.g., xylem, sclerench…The substance dichlorophenyldimethylurea (DCMU) is an herbicide that in- hibits photosynthesis by blocking electron transfer between plastoquinones in photosystem II. (a) Would you expect DCMU to interfere with cyclic photophosphorylation? (b) Normally, DCMU blocks Oz evolution, but addition of ferricyanide to chloroplasts allows O, evolution in the presence of DCMU. Explain.
- Photosynthesis can be measured by measuring the rate of oxygen production. When plants are exposed to light of wavelength 680 nm, more oxygen is evolved than if the plants are exposed to light of 700 nm. Explain.The substance dichlorophenyldimethylurea (DCMU) is an herbi- cide that inhibits photosynthesis by blocking electron transfer between plastoquinones in photosystem II. (a) Would you expect DCMU to interfere with cyclic photophos- phorylation? (b) Normally, DCMU blocks Oz evolution, but addition of ferri- cyanide to chloroplasts allows Oz evolution in the presence of DCMU. Explain.compare and contrast chloroplastss and mitochonndria from teh perspective of : organization of their electron transportation systems (z-scheme versus ETC)
- Biologists think that endosymbiosis gave rise to mitochondriabefore plastids partly because(A) the products of photosynthesis could not be metabolizedwithout mitochondrial enzymes.(B) all eukaryotes have mitochondria (or their remnants),whereas many eukaryotes do not have plastids.(C) mitochondrial DNA is less similar to prokaryotic DNA thanis plastid DNA.(D) without mitochondrial CO2 production, photosynthesiscould not occur.Magaia et al. illustrated in Figure 2 the relationship of photosynthetic of temperature rate and respiration rate of C3 plants as a function (2015). Which process hampers the carbohydrate synthesis when the temperature exceeds 30°C? respiration photosynthesis 0 10 40 50 20 30 temperature C Figure 2. Relationship of photosynthetic rate and respiration rate in response to temperature. Ⓒ Magaia et al., 2015 O a. Light-dependent reaction O b. Light-independent reaction O c. Photorespiration O d. Photolysis of water rateMelvin Calvin and Andrew Benson determined the steps in the light-independent reactions of photosynthesis by exposing the green alga Chlorella to CO2 labeled with the radioisotope carbon 14. By looking at which compounds the C14 ended up in, they were able to identify all intermediates in this cyclic pathway. Why did they predict correctly that the same set of intermediates would be formed in the light reaction in land plants?
- What are the origins and evolutionaryhistory of photosynthetic complexes?Are there undiscovered types ofphotosynthesis present on Earth tohelp answer this question?The substance dichlorophenyldimethylurea (DCMU) is an herbicide thatinhibits photosynthesis by blocking electron transfer between plastoquinones in photosystem II.(a) Would you expect DCMU to interfere with cyclic photophosphorylation?(b) Normally, DCMU blocks O2 evolution, but addition of ferricyanide to chloroplasts allows O2 evolution in the presence of DCMU. Explain.1) Evolution led to the formation of RuBisCO that is used by C3 plants to fix CO2. Why do you think that it led to an enzyme that also binds to O2 (which causes photorespiration that isn't beneficial to the plant)? 2) Explain what is meant by the statement: "C4 plants separate C3 and C4 processes in space and CAM plants separate C3 and C4 processes in time."