Radioactive Isotopes Are Useful in Biological Studies Because

question 49

Multiple Choice

Radioactive isotopes are useful in biological studies because

• A) an organism will take in a molecule with the isotope and use it normally, but the radioactive decay can be detected.
• B) an organism will take in a molecule with the isotope but will only use it in a few specific reactions, not the normal ones.
• C) an organism will take in the molecule with the isotope and then remove the isotope by sending it through the excretory system, while replacing the isotope with a normal atom.
• D) they are easily visible and normal atoms are not.
• E) they are easy and inexpensive to use in studies.

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Definitions:

Permanent Accounts

These are balance sheet accounts whose balances are carried over to the next accounting period, such as assets, liabilities, and equity accounts.

Income Summary Account

A temporary account used in accounting to transfer the sums of revenues and expenses at the end of an accounting period.

Dividends Declared Account

An account used to record the amount of dividends that a company's board of directors has decided to distribute to its shareholders.

Post-closing Trial Balance

A list of all accounts still open after closing entries are made, used to verify the equality of debits and credits.