Cell Biologists Have Introduced Radioactively Labeled Carbohydrates,fats,and Amino Acids to Living

question 43

Multiple Choice

Cell biologists have introduced radioactively labeled carbohydrates,fats,and amino acids to living cells,allowed time for cell metabolism,and then placed the cells in a blender and separated out the various cell organelles from the cytoplasm.They found the radioactive molecules could soon be detected as part of various cellular compounds,although the visible cell structures appeared unchanged.Which of the following is the best conclusion based on this information?

• A)These "food" molecules are used only for energy.
• B)Most cell components are constantly being broken down and rebuilt.
• C)Radioactivity was transferred from the introduced molecules to the resident stable molecules.
• D)Molecules diffuse at random through the cytoplasm and into cell organelles.
• E)Radioactivity has an unusual role in the metabolism of living cells.

---

Definitions:

Bonds Payable

Long-term liabilities represented by promissory notes issued by a company to borrow funds, repayable at a specified future date along with interest.

Unamortized Discount

The portion of a bond's issue price that is below its face value and has not yet been expensed over the life of the bond.

Straight-Line Method

A method of calculating depreciation or amortization by evenly spreading the cost of an asset over its useful life.

Consolidated Statement

A financial document that presents the combined financial position and results of operations for a parent company and its subsidiaries, treating them as a single economic entity.