Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Question
Diagram a gene showing the critical features that could be used to determine if a particular region of DNA sequence represents a gene or not.
Expert Solution
Step 1
locating genes is easy because protein coding DNA sequences begin with the three bases ATG that code for methionine [AUG codon]. But this is not straightforward because methionine codons are also found within genes.
the gene sequence ends with one of the 3 stop codons, TAA, TAG or TGA, so using these, the end of a gene region can be found out.
Unfortunately, finding genes isn't always so easy because we might come across open reading frames [ORF]. An ORF is any stretch of DNA that when transcribed into RNA has no stop codon
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