HERE is the answer.

2. Why would feeding the animals 15N glycine determine whether the symptoms are caused by a defect in the de novo purine synthesis? HERE is the answer.

3. Some animals have high levels of orotic acid in the urine (orotic aciduria). These animals are anemic and have stunted growth due to a defect in orotidylate decarboxylase. What treatment do you recommend and why?

HERE is the answer.

4. What is the effect of blocking TATA-binding protein from binding to the TATA box?

HERE is the answer.

5. How do leucine zipper domains in transcription factors mediate protein dimerization?

HERE is the answer.