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TLS Online TPP Program

#Question id: 34120

The dynamic nature of DNA binding to the histone core structure is important, because many DNA-binding proteins strongly prefer to bind to histone-free DNA. Such proteins can recognize their binding site only when it is released from the histone octamer or is contained in linker or nucleosome-free DNA.

Which of the following statement stands untrue for above fact

#Unit 2. Cellular Organization
  1. DNA-binding site for a given protein on nucleosome can be found anywhere on wrapped DNA
  2. A binding site near position 73 of the 147 bp tightly associated with a nucleosome is rarely accessible. 
  3. Binding sites near the ends (position 1 or 147) of the nucleosomal DNA are most frequently accessible.
  4. Mechanism of exposure is due to unwrapping of the DNA from the nucleosome, rather than to the DNA briefly coming off the surface of the histone octamer
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TLS Online TPP Program

#Question id: 19240

#Unit 12. Applied Biology

What are the effects of these antibiotics on plant cells?
1. Inhibit greening
2. Inhibit faster proliferation
3. Lowers shoot formation
Which of the following above statements are correct?
TLS Online TPP Program

#Question id: 10324

#Unit 9. Diversity of Life Forms

Which of the following is not true of all horizontally oriented phylogenetic trees, where time advances to the right?
TLS Online TPP Program

#Question id: 5648

#Unit 5. Developmental Biology

Use the following information to answer the question. In order to test how sea urchin sperm bind to eggs, scientists isolated the egg receptor protein that binds to the sperm acrosomal protein called bindin. Plastic beads were coated with egg receptor for bindin (ERB1) from eggs of the sea urchin Strongylocentrotus purpuratus, and then the beads mixed with sperm from S. purpuratus or from the related species, S. franciscanus. The researchers counted how many sperm were bound to each bead. The results are shown in the graph below. Treatments:

A: S. purpuratus sperm mixed with S. purpuratus ERB1 beads

B: S. purpuratus sperm mixed with beads containing no ERB1 protein

C: S. franciscanus sperm mixed with S. purpuratus ERB1 beads

D: S. franciscanus sperm mixed with beads containing no ERB1 protein

 What is a broader implication from the observations of the experiment?
TLS Online TPP Program

#Question id: 8926

#Unit 9. Diversity of Life Forms

Sponges and cnidarians are among the fossilized animals found in both the Ediacara Hills and the Burgess Shale from the Rocky Mountains of British Colombia. This observation requires that
TLS Online TPP Program

#Question id: 11481

#Unit 7. System Physiology – Animal

Which of the following sensory receptors is correctly paired with its category?