Becker's World of the Cell (9th Edition)
9th Edition
ISBN: 9780321934925
Author: Jeff Hardin, Gregory Paul Bertoni
Publisher: PEARSON
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Textbook Question
Chapter 20, Problem 20.13PS
Levels of Control. If sea urchin zygotes are exposed to actinomycin D, an inhibitor of RNA synthesis, during the early stages of embryonic development, protein synthesis and development continue until the embryos form a hollow ball of cells, or blastula, with hundreds of cells. However, if the same inhibitor is added later during embryonic development, protein synthesis is severely depressed, and normal embryonic development halts. How might you explain these observations?
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MULTIPLE CHOICE
In patients with Lesch Nyhan Syndrome, purine nucleotides are overproduced and over excreted. The hypoxanthine analogue Allopurinol, which effectively treats gout , has no effect on the severe neurological symptoms of Lesch- Nyhan patients because it does not
A. decrease de novo pyrimidine synthesis
B. decrease de novo purine synthesis
C. decrease urate synthesis
D. increase PRPP levels (Phosphoribosyl pyrophosphate)
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Chapter 20 Solutions
Becker's World of the Cell (9th Edition)
Ch. 20 - Suppose you are analyzing a haploid E. coli strain...Ch. 20 - How do epigenetic changes, such as DNA...Ch. 20 - Compare the basic state of a gene in bacteria...Ch. 20 - Prob. 1QCh. 20 - Prob. 20.4CCCh. 20 - Prob. 20.1PSCh. 20 - The Pickled Prokaryote. Pickelensia hypothetica is...Ch. 20 - Prob. 20.3PSCh. 20 - Attenuation in 25 or Fewer Words. Complete each of...Ch. 20 - Prob. 20.5PS
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