Researchers conducted a genetic study of the toxin transport protein (PA) of Bacillus anthracis, the bacterium that causes anthrax in humans (Price et al., 1999. J. Bacteriol. 181: 2358–2362). In 26 strains, they identified five point mutations—two missense and three synonyms (silent mutations that do not change an encoded amino acid)—among different isolates of the 2294-nucleotide gene. Necropsy samples from an anthrax outbreak in 1979 revealed a novel missense mutation and five unique nucleotide changes in samples collected from ten victims. The authors concluded that these data indicate little or no horizontal transfer between different B. anthracis strains.

(a) Which types of nucleotide changes (missense or synonyms) cause amino acid changes?

(b) What is meant by horizontal transfer?

(c) On what basis did the authors conclude that evidence of horizontal transfer is absent from their data?

Share this :
Share on facebook
Share on twitter
Share on whatsapp
Share on pinterest

Found something interesting ?

• On-time delivery guarantee
• PhD-level professional writers
• Free Plagiarism Report

• 100% money-back guarantee
• Absolute Privacy & Confidentiality
• High Quality custom-written papers

Related Model Questions

Feel free to peruse our college and university model questions. If any our our assignment tasks interests you, click to place your order. Every paper is written by our professional essay writers from scratch to avoid plagiarism. We guarantee highest quality of work besides delivering your paper on time.

Special Offer

Use the Coupon Code: SAVE25 to save 25% on your next order.