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Question
what component is present in every part of a loop, such as one the involves proteins producing energetic molecules from sugar?

Answer
Hi, Sarah. I don't quite understand your question. What do you mean by "loop"? Do you mean a pathway or a process that cycles? The process by which sugar is broken down and produces energy is mediated by a particular set of proteins that recognize each intermediate product and react with it to form the next product in the process. These proteins are called enzymes. They act as catalysts for these reactions in converting one thing into another but are not used up themselves during the reaction so they can keep going and going, as long as there's stuff they can work on (generally called substrates). So, I guess "enzymes" would be the answer you're looking for, if I understand your question right.

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Joy Ramos

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PhD student in Biological Sciences at Northwestern U. I can answer questions related to cell and molecular biology, especially those about the basic processes or techniques involved in the life of a cell. I can also answer questions about insulin receptors, since that is my area of expertise. I have a great interest in how scientific discoveries impact society so feel free to ask me about current "hot" science topics in the news and I will try to researcha and share with you the most relevant facts.

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I am a graduating PhD student in Biological Sciences with experience in relaying science to people with non-science backgrounds.

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AAAS, AWIS, AAUW

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PhD in Biological Sciences from Northwestern University - expected in Dec. 2006
B.S. in Molecular Biology and Biotechnology from University of the Philippines (magna cum laude)

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American Association of University Women (AAUW) - International Fellow
AT&T Outstanding Student Leadership awardee for Asia
Most Oustanding Student in Science & Technology Cluster, University of the Philippines

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