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TLS Online TPP Program

#Question id: 7154

Cancer is believed to often arise from stem cells, rather than fully differentiated cells. Which of the following are consistent with this view?

#Unit 5. Developmental Biology
  1. Stem cells are actively dividing and express few differentiated functions, so they may have fewer changes to undergo than do fully differentiated cells in becoming cancer cells.
  2. DNA replication is necessary for mutations to occur, and stem cells are replicating their DNA whereas differentiated cells are for the most part not replicating their DNA.
  3. Teratocarcinomas are tumors that arise from germ cells or embryonic stem (ES) cells, under certain circumstances, demonstrating that tumors can arise from stem cells without further mutation.
  4. All of the above are reasons that cancer cells may more readily arise from stem cells than from fully differentiated cells.
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TLS Online TPP Program

#Question id: 34105

#Unit 2. Cellular Organization

A. The histone H3 variant Cse4 is incorporated in the centromeric nucleosome.
B. The CBF3 protein complex that binds to CDE-III is essential for centromeric function.
C. The proteins that bind CEN serve as an assembly platform for the kinetochore and provide the connection to microtubules.

Find true and false
TLS Online TPP Program

#Question id: 29476

#Unit 6. System Physiology – Plant

All Gibberellins are
a. tetracyclic (four ringed) 
b. pentacyclic (five ringed) 
c. diterpenoid acids
d. Non terpenoid acids
Which of the following is CORRECT
TLS Online TPP Program

#Question id: 2740

#Unit 2. Cellular Organization

Escherichia coli use antisense regulation to switch the expression of outer membrane proteins. Antisense _____________.
TLS Online TPP Program

#Question id: 19027

#Unit 9. Diversity of Life Forms

The following characteristics all helped seedless plants become better adapted to land except 
TLS Online TPP Program

#Question id: 18075

#Unit 13. Methods in Biology

At high salt concentrations, the mRNA containing poly(A) tails binds to the complementary oligo(dT) molecules of the affinity column, and so, mRNA will be retained; all other RNA molecules can be washed through the column by further high salt solution. finally, the bound mRNA can be eluted by using