Practice Questions

TLS Online TPP Program

#Question id: 2949

A culture of cells is given 3H-thymidine for 30 minutes; then a sample of the cells is fixed and examined by autoradiography. It is found that:

#I Life Science/ Life Sciences Group – I-V

all of the cells engaged in mitosis have incorporated the labeled thymidine into their chromosomes.
none of the cells engaged in mitosis have incorporated the labeled thymidine into their chromosomes.
all of the cells, both mitotic and nonmitotic, have incorporated the labeled thymidine into their chromosomes.
none of the cells, neither mitotic nor nonmitotic, have incorporated the labeled thymidine into their chromosomes.

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#Question id: 4334

#SCPH28 | Zoology

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#Question id: 4335

#SCPH01 Biochemistry

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#Question id: 4335

#SCPH05 I Biotechnology

Which of the following mutations would be most likely to have a harmful effect on an organism?

#Question id: 4335

#SCPH06 I Botany

Which of the following mutations would be most likely to have a harmful effect on an organism?

#Question id: 4335

#SCPH28 | Zoology

Which of the following mutations would be most likely to have a harmful effect on an organism?

#Question id: 4336

#SCPH05 I Biotechnology

Which of the following processes would result from a mutation that deactivates a regulatory gene of a repressible operon in an E. coli cell?