Phytochrome-mediated control of photomorphogenesis is linked to many other gene functions. The following statements are made on the mechanism of phytochrome action:

a) COP1, negative regulator of photomorphogenesis, is a component of the E3 ubiquitin ligase complex that targets photomorphogenesis-promoting proteins for degradation such as phyA

b) Light-dependent export of COP1 to the cytoplasm is a slow process, requires long exposure to light

c) The absence of COP1 in the cytosol permits the accumulation of transcriptional activators necessary for photomorphogenic development

d) The COP1–SPA1-E3 ligase complex is also responsible for the ubiquitination and proteasomal degradation of photomorphogenesis-promoting proteins, such as HY5

Which one of the following combinations is correct?

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#Question id: 24202

#Unit 4. Cell Communication and Cell Signaling

Homophilic Binding appears:

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#Question id: 3336

#Unit 11. Evolution and Behavior

There are 4 alleles at a given locus in a diploid population and all alleles are equal abundant. What is the proportion of all homozygotes in the population?

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#Question id: 7075

#Unit 5. Developmental Biology

During limb formation, wnt signaling determines which of the following axis?

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#Question id: 12546

#Unit 10. Ecological Principles

Use the survivorship curves in Figure to answer the following questions

Which curve best describes survivorship in elephants?

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#Question id: 10234

#Unit 10. Ecological Principles

You observed the two species of barnacles, species 1 and species 2, occupy upper and lower strata of intertidal rocks, respectively. Only when species 1 was removed by you from the upper strata, species 2 could occupy both the upper and lower strata. From the choice given below what would be your inference from these observations.