In the process of creating a trp operon mutant, the UGG codons within the leader sequence were accidentally deleted. Which of the following would be a likely observation in the transcription assays? ___

A. RNA polymerase cannot bind to the promoter. 

B. The operon is permanently inhibited. 

C. Attenuation would be impaired. 

D. Termination would be triggered. 

E. No tryptophan would be made.

TLS Online TPP Program

#Question id: 16132

#Unit 13. Methods in Biology

You are running a human assisted reproduction clinic and providing state-of-the-art genetic diagnostic services. A married couple who already had a child with cystic fibrosis approach you because they wish to have another child, but only if they can be assured that the child will not have cystic fibrosis. You genotype the woman and discover that she is a heterozygote for Del508, the most common mutation causing cystic fibrosis. You suggest that the couple consider first polar body testing, in which several unfertilized oocytes (each with its first polar body) are retrieved from the woman, the first polar bodies are removed, and PCR tests are conducted on DNA from each of the first polar bodies. The couple agrees, and you obtain the following results:

 

the observation that the polar bodies for oocytes #1 and #5 test positive for both Del508 and the wild type sequence, because

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#Question id: 425

#Unit 1. Molecules and their Interaction Relevant to Biology

Which is usually the slowest way to regulate a reaction in a metabolic pathway?

TLS Online TPP Program

#Question id: 19813

#Unit 12. Applied Biology

Antisense RNA approach is one of the strategies for producing virus resistant transgenic plants. How this provides protection?

TLS Online TPP Program

#Question id: 11229

#Unit 9. Diversity of Life Forms

Which is the bacterial structure that acts as a selective barrier, allowing nutrients to enter the cell and wastes to leave the cell.

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#Question id: 2958

#Unit 2. Cellular Organization

Which of the following structures is not a feature of the mitotic chromosome?