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TLS Online TPP Program

#Question id: 10743

 Darlington proposed that

#Unit 10. Ecological Principles
  1. Climax communities are self-maintaining
  2. The number of species inhabiting an island doubles with every tenfold increase in area
  3. Extinction rates are higher on larger islands and lower on smaller islands
  4. The number of species of a taxon inhabiting an island maintains a dynamic equilibrium, with the immigration of new species balancing the extinction of previously established species
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TLS Online TPP Program

#Question id: 23102

#Unit 2. Cellular Organization

How many times DNA is folded/compacted when a 200bp DNA is wrapped over core histone 
TLS Online TPP Program

#Question id: 23103

#Unit 2. Cellular Organization

What is 1st level of compaction while making/packaging the nucleosome  
TLS Online TPP Program

#Question id: 23104

#Unit 2. Cellular Organization

Which of the following statement is true regarding second level of organization 
a. The second level of organization is the coiling of the 10-nm fiber of nucleosomes into a helical array.
b. The coiled helical array to constitute the fiber of diameter 30 nm that is found in interphase chromatin and in mitotic chromosomes.
c. This compacts the DNA - 40-fold. The structure of this fiber requires the histone tails and is stabilized by linker histones.
d. Histone H1, histone tails, and increased ionic strength all promote the formation of the 30-nm fiber.
TLS Online TPP Program

#Question id: 23105

#Unit 2. Cellular Organization

What is 2nd level (making 30 nm) of compaction while making/packaging the nucleosome  
TLS Online TPP Program

#Question id: 23106

#Unit 2. Cellular Organization

Some of the events are mentioned below, Choose the incorrect statement, 
TLS Online TPP Program

#Question id: 23107

#Unit 2. Cellular Organization

Choose the correct statement
a.The 30-nm fiber is further folded, results in 10000-fold compaction in euchromatin in interphase chromatin and in mitotic chromosomes to achieve an overall 10,00- fold compaction in euchromatin.
b.This 30-nm fiber is further folded, results in 1000-fold compaction in euchromatin in interphase chromatin and in mitotic chromosomes to achieve an overall 10,000- fold compaction in euchromatin.
c.Heterochromatin generally maintains 10,000-fold compaction in both interphase and mitosis after 30 nm.
d.Heterochromatin generally maintains 10,00-fold compaction in interphase and 10,000 folds in  mitosis after 30 nm.