Practice Questions

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

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.
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.
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.
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: 3055

#Unit 2. Cellular Organization

300 CFU will form on petriplate if 0.1ml sample plating from 10^6 diluted sample. Original sample contain bacteria per ml is

TLS Online TPP Program

#Question id: 2559

#Unit 2. Cellular Organization

Even though plants cells carry out photosynthesis, they still use their mitochondria for oxidation of pyruvate. Under what conditions will plant cell mitochondria be active in this process?

TLS Online TPP Program

#Question id: 28604

#Unit 2. Cellular Organization

What will cause the phosphorylation of T14 and Y15 in this G-loop?

a) It introduces negative charge that electrostatically interferes with the binding of ATP in the catalytic pocket

b) It introduces ionic bond interferes with the binding of ATP in the catalytic pocket

c) play a critical role in controlling CDK activity

d) Allows the binding of CDK with cyclins

Which of the following is correct about phosphorylation;

TLS Online TPP Program

#Question id: 3041

#Unit 2. Cellular Organization