Isotopic Labeling of a Specific Substrate Carbon with ¹³C,which Has

question 8

Multiple Choice

Isotopic labeling of a specific substrate carbon with ¹³C,which has an extra neutron,is particularly useful for investigating biochemical pathways because

• A)the presence of the radioisotope greatly accelerates the pathway,which makes it easier to study.
• B)the position of the labeled carbon can be traced through products of the pathway to characterize the pathway reactions.
• C)the radioisotope blocks each pathway at a specific step.
• D)the radioisotope readily exchanges neutrons so that all neighboring carbons become labeled and easier to detect with NMR.
• E)radiolabels generally are easier to track in cells than fluorescent labels.

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Definitions:

Leverages

The use of borrowed money (debt) in addition to equity in the investment to finance the purchase of assets and increase the potential return on investment.

Statement of Cash Flows

A financial report that shows how changes in balance sheet accounts and income affect cash and cash equivalents, dividing activity by operating, investing, and financing activities.

Quick Ratio

A liquidity ratio that measures a company's ability to meet its short-term obligations with its most liquid assets, excluding inventories.

Return on Sales

A financial ratio that calculates a company's net income relative to its revenue, showing how efficiently it converts sales into profits.