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: 68

#Unit 1. Molecules and their Interaction Relevant to Biology

Match the following functional groups given in column I with their respective representatives given in column II.

COLUMN I               COLUMN II

1. Anhydride               a. RCOOR

2. Ether                       b. ROCOCH3

3. Acetyl                     c. ROR

4. Amido                     d. RCOOCOR

5. Ester                        e. RCONH2

TLS Online TPP Program

#Question id: 68

#Unit 1. Molecules and their Interaction Relevant to Biology

Match the following functional groups given in column I with their respective representatives given in column II.

COLUMN I               COLUMN II

1. Anhydride               a. RCOOR

2. Ether                       b. ROCOCH3

3. Acetyl                     c. ROR

4. Amido                     d. RCOOCOR

5. Ester                        e. RCONH2

TLS Online TPP Program

#Question id: 69

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following is the diastereomer of the following compound?

TLS Online TPP Program

#Question id: 70

#Unit 1. Molecules and their Interaction Relevant to Biology

The dimensions of living cells are limited, on the lower end by the minimum number of biomolecules necessary for function, and on the upper end by the rate of diffusion of solutes such as oxygen. Except for highly elongated cells, they usually have lengths and diameters in the range of

TLS Online TPP Program

#Question id: 71

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following is not the priority rule for R, S Configuration?

TLS Online TPP Program

#Question id: 72

#Unit 1. Molecules and their Interaction Relevant to Biology

For the reaction catalyzed by the enzyme hexokinase: Glucose + ATP → glucose 6-phosphate + ADP the equilibrium constant, Keq, is 7.8 × 102. In living E. coli cells, [ATP] = 5 mM, [ADP] = 0.5 mM, [glucose] = 2 mM, and [glucose 6-phosphate] = 1 mM. Which of the following conclusions made on the basis of the above calculations is incorrect?