Biologists Label Various Carbohydrates,fats and Amino Acids with Radio-Isotopes,place Them

question 5

Multiple Choice

Biologists label various carbohydrates,fats and amino acids with radio-isotopes,place them in a cell culture,and allow time for cell metabolism.Then by disrupting cells in a blender and separating out various cell organelles,they find the radioactive molecules can be detected as part of various cellular compounds although visible cell structures appear unchanged.Therefore

• A)these "food" molecules are used only for energy.
• B)most cell components are constantly being broken down and rebuilt.
• C)molecules diffuse at random through the cytoplasm and into cell organelles.
• D)radioactivity has an unusual role in metabolism of living cells.

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Labour Relations Board

A regulatory body that oversees and enforces labor laws related to the rights of employers and employees, including union activities and collective bargaining.

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The act of labor unions representing the interests of their members in negotiations with employers.

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