methionine, just in case your yeast happens upon circumstances where it can’t eat methionine. It seems wasteful to produce these proteins all the time though. Why?   Question 2) In order to not waste a bunch of energy and materials making proteins to make methionine when the yeast doesn’t need to make methionine. You organize the DNA so that the genes are controlled by a promoter. Which promoter makes sense and why? i) lac promoter, turns on when lactose is present. ii) Pmet3 promoter, turns off when methionine is present. iii) pbr promoter, turns on when lead is present.

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 1) Imagine you’re making a yeast from scratch, and you’re worried your yeast may sometimes not have access to the amino acid methionine. You decide to put some genes in that code for proteins that allow it to make methionine, just in case your yeast happens upon circumstances where it can’t eat methionine. It seems wasteful to produce these proteins all the time though. Why?

 

Question 2) In order to not waste a bunch of energy and materials making proteins to make methionine when the yeast doesn’t need to make methionine. You organize the DNA so that the genes are controlled by a promoter. Which promoter makes sense and why?

i) lac promoter, turns on when lactose is present.

ii) Pmet3 promoter, turns off when methionine is present.

iii) pbr promoter, turns on when lead is present.

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