Stem cells and cell specialisation Quiz
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5 questions, one answer each
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1. Which type of cell can form a complete organism and the placenta?
- A. Pluripotent
- B. Totipotent
- C. Specialised
- D. Adult stem
2. A specialised cell makes a particular protein but not others. Why?
- A. It has lost the genes it does not need
- B. It has fewer chromosomes
- C. It has no mRNA at all
- D. Only some of its genes are expressed
3. In the lac operon, what happens when lactose is absent?
- A. The repressor binds to the operator and prevents transcription
- B. The repressor leaves the operator
- C. RNA polymerase binds to the operator
- D. The structural genes are transcribed continuously
4. What is a reason for using a patient's own stem cells in therapy?
- A. They are totipotent
- B. They are always available in large numbers
- C. They avoid destroying an embryo and reduce rejection risk
- D. They never divide uncontrollably
5. A mutation stops lactose binding to the repressor of the lac operon. What is the effect on E. coli in a medium containing lactose?
- A. Beta-galactosidase is made at a high rate
- B. The repressor cannot bind to the operator
- C. The cell makes more lactose
- D. Beta-galactosidase is not made