Questions from Genetics

Q: Are queen and worker bees genetically different from each other?

Are queen and worker bees genetically different from each other?

Q: When DNA N-glycosylase recognizes a thymine dimer, it detects

When DNA N-glycosylase recognizes a thymine dimer, it detects only the thymine located on the 5′ side of the dimer as being abnormal. Make a drawing and explain the steps whereby a thymine dimer is re...

Q: What is the underlying genetic defect that causes xeroderma pigmentosum? How

What is the underlying genetic defect that causes xeroderma pigmentosum? How can the symptoms of this disease be explained by the genetic defect?

Q: Three common ways to repair changes in DNA structure are nucleotide excision

Three common ways to repair changes in DNA structure are nucleotide excision repair, mismatch repair, and homologous recombination repair. Which of these three mechanisms would be used to fix the foll...

Q: Discuss the similarities and differences between nucleotide excision repair and the mismatch

Discuss the similarities and differences between nucleotide excision repair and the mismatch repair system.

Q: In E. coli, a methyltransferase enzyme encoded by the dam

In E. coli, a methyltransferase enzyme encoded by the dam gene recognizes the sequence 5′–GATC–3′ and attaches a methyl group to the nitrogen at position 6 of adenine. E. coli strains that have the da...

Q: A species of bacteria can synthesize the amino acid histidine, so

A species of bacteria can synthesize the amino acid histidine, so they do not require histidine in their growth medium. A key enzyme, which we will call histidine synthetase, is necessary for histidin...

Q: Using three examples, describe how allosteric sites are important in the

Using three examples, describe how allosteric sites are important in the function of genetic regulatory proteins.

Q: How are the actions of lac repressor and trp repressor similar and

How are the actions of lac repressor and trp repressor similar and how are they different with regard to their binding to operator sites, their effects on transcription, and the influences of small ef...

Q: Transcriptional repressor proteins (e.g., lac repressor), antisense

Transcriptional repressor proteins (e.g., lac repressor), antisense RNA, and feedback inhibition are three different mechanisms that turn off the expression of genes and gene products. Which of these...