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TLS Online TPP Program

#Question id: 3829

Why is only one copy of DNA made per cell division cycle in eukaryotes despite the presence of multiple origins of replication?

#Unit 3. Fundamental Processes

  1. There is only one origin of replication per chromosome.

  2. The rate of elongation proceeds at a rate that allows only one copy to be made by the time the cell divides.

  3. The activity of an S-phase protein kinase controls the formation of the pre-replication complex.

  4. Primase is activated by phosphorylation only at the onset of S-phase by S-phase protein kinase.

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TLS Online TPP Program

#Question id: 16788

#Unit 13. Methods in Biology

If he arithmetic mean between a " 1 and b, then n is equal to 
TLS Online TPP Program

#Question id: 16789

#Unit 13. Methods in Biology

The median of number 50, 48, 47, 48.5, 50.5, 52, 48.8, 46 will be: 
TLS Online TPP Program

#Question id: 16790

#Unit 13. Methods in Biology

For the moderately symmetrical distribution of age of the employees, mean = 20 and mode = 25. The approximate value of the median is: 
TLS Online TPP Program

#Question id: 16791

#Unit 13. Methods in Biology

The mode of a distribution is 24 and the mean is 60. What is its median? 
TLS Online TPP Program

#Question id: 16953

#Unit 4. Cell Communication and Cell Signaling

The ability of any stem cell to self-renew and differentiate depends on the structural organization and cellular function of specialized anatomic microenvironments known as stem cell niches. These sequestered regions are typically populated by a supportive network of stromal cells. Stem cell niche stromal cells express soluble and membrane-bound proteins that regulate cell survival, proliferation, differentiation, and trafficking. Which statements is true about HSCs?
TLS Online TPP Program

#Question id: 16954

#Unit 4. Cell Communication and Cell Signaling

match the following

 

 

A. endosteal niche

1. versatile cells that both generate bone and control the differentiation of HSCs

B. osteoblasts

2. line the blood vessels and also regulate HSC differentiation

C. reticular cells

3. send processes connecting cells to bone and blood vessels, and, unexpectedly

D. sympathetic neurons

4. can control the release of hematopoietic cells from the bone marrow.