LIFE: THE SCIENCE OF BIOLOGY
11th Edition
ISBN: 9781319145125
Author: Sadava
Publisher: MAC HIGHER
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Chapter 16.1, Problem 1R
Summary Introduction
To review:
Five mechanisms that the cell could use to reduce the activity of Xase in the absence of sugar X.
Introduction:
The prokaryotes synthesize the proteins only when their need arises. This is carried out by shutting off the mechanisms, through which the proteins are synthesized. The prokaryotes do this to save energy as well as
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Enzymatic activity is rapidly destroyed at physiologically high temperatures. How do you reconcile this observation with the existence of bacteria and algae that grow in hot springs where the temperature may be as high as 73 °C?
Kinases catalyze the transfer of a phosphate group from a phosphate donor such as adenosine triphosphate (ATP) to a substrate. A well‑known kinase is hexokinase. Hexokinase catalyzes the first step of the glycolysis cycle, and converts glucose to glucose‑6‑phosphate.
The reaction of glucose with ATP is shown. The enzyme‑bound base is abbreviated as :B−, and ATP is abbreviated as a diphosphate bonded to adenosine monophosphate (AMP).
Kinases catalyze the transfer of a phosphate group from a phosphate donor such as adenosine triphosphate (ATP) to a substrate. A well‑known kinase is hexokinase. Hexokinase catalyzes the first step of the glycolysis cycle, and converts glucose to glucose‑6‑phosphate.
The reaction of glucose with ATP is shown. The enzyme‑bound base is abbreviated as :B−, and ATP is abbreviated as a diphosphate bonded to adenosine monophosphate (AMP).
The first arrow of the reaction mechanism is drawn for you; draw the remaining curved arrows to show how phosphorylation occurs.
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