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Human Anatomy & Physiology (11th Edition)
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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i dont understand, pls help ASAP, thank you!

Aspartate-4-P aspartate semialdehyde dihydrodipicolinate homoserine O-succinylhomoserine homoserine-P L-threonine a-oxobutyrate L-Lysine L-methionine L-isoleucine Members of the aspartate family of amino acids (lysine, methionine, threonine, and isoleucine) are produced by the branched pathway shown above. Each end product inhibits and/or represses the first enzyme of the common pathway, aspartate kinase (shown as three arrows). However, so that one product does not shut down all of the kinase activity, three different isozymes (different enzymes that catalyze the same chemical reaction) of aspartate kinase are present: one sensitive to lysine inhibition, one sensitive to threonine inhibition, and one repressed mainly by excess methionine. In addition to inhibition of the first enzyme of the common pathway, briefly explain why it makes sense that the end-products of each branch would also negatively regulate the first step in the branches specific to their own production (as shown circled in red).
Transcribed Image Text:Aspartate-4-P aspartate semialdehyde dihydrodipicolinate homoserine O-succinylhomoserine homoserine-P L-threonine a-oxobutyrate L-Lysine L-methionine L-isoleucine Members of the aspartate family of amino acids (lysine, methionine, threonine, and isoleucine) are produced by the branched pathway shown above. Each end product inhibits and/or represses the first enzyme of the common pathway, aspartate kinase (shown as three arrows). However, so that one product does not shut down all of the kinase activity, three different isozymes (different enzymes that catalyze the same chemical reaction) of aspartate kinase are present: one sensitive to lysine inhibition, one sensitive to threonine inhibition, and one repressed mainly by excess methionine. In addition to inhibition of the first enzyme of the common pathway, briefly explain why it makes sense that the end-products of each branch would also negatively regulate the first step in the branches specific to their own production (as shown circled in red).
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