There are five known families of enzyme complexes that actively move or displace nucleosomes, hydrolyzing ATP in the process, three of which are particularly important in transcriptional activation. Which of the following statement is/are correct regarding these nucleosome remodeling complexes?

I. SWI/SNF remodels chromatin so that nucleosomes become more irregularly spaced, and stimulate the binding of transcription factors. It includes a bromodomain near the C-terminus of the active ATPase subunit, which interacts with acetylated histone tails.

II. Some members of a family, SWR1, are involved in deposition of the H2A.Z histone variant in transcriptionally inactive chromatin. 

III. NURF, a member of the ISW1 family, remodels chromatin in ways that complement and overlap the activity of SWI/SNF. These two enzyme complexes are crucial in preparing a region of chromatin for active transcription.

#Question id: 367

#Unit 1. Molecules and their Interaction Relevant to Biology

1.0 × 10^−4 mole of H+ (as HCl) is added to 1.0 liter of pure water. Determine the final pH of the solution.

#Question id: 28944

#Unit 7. System Physiology – Animal

#Question id: 10581

#Unit 10. Ecological Principles

Life-history characteristics associated with K-selected organisms include

#Question id: 10177

#Unit 6. System Physiology – Plant

Shady habitats proportionally more abundant far-red light, which is absorbed primarily by photosystem I (PSI) at P700nm, for better balance the flow of energy through PSII and PSI so, what will be the changes appear to enhance light absorption and energy transfer in shady environments?

a.) some shade plants is to produce a higher ratio of PSII to PSI reaction centers, compared with that found in sun plants

b.) photosystem I (PSI) for enhancing light absorption and energy transfer in shady plants increases their reduction potential

c.) some shade plants add more antenna chlorophyll to PSII to increase absorption by this photosystem

d.) photosystem I (PSI) for enhancing light absorption and energy transfer in shady plants decreases their reduction potential

Which of the following above combination is TRUE?

#Question id: 34140

#Unit 7. System Physiology – Animal