The Spectra of Quasars Reveal Lines of Elements Such as Nitrogen

question 13

Multiple Choice

The spectra of quasars reveal lines of elements such as nitrogen and carbon.These elements are as abundant in quasars as in the Sun.Which of the following is a correct reflection on this fact?

• A)This is to be expected,since quasars are powered by nucleosynthesis
• B)This observation verifies our ideas on the evolutionary status of quasars
• C)This is odd,since quasars are old and should have Pop.II abundances
• D)This is unexpected,quasars should have large amounts of iron

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Definitions:

Gap Junctions

Gap junctions are specialized intercellular connections between a multitude of animal cell-types, facilitating the direct transfer of ions and small molecules.

Desmosomes

Buttonlike plaques, present on two opposing cell surfaces, that hold the cells together by means of protein filaments that span the intercellular space.

Gap Junctions

Specialized cell-cell connections that enable direct communication by allowing the transfer of ions and small molecules between neighboring cells.

ATP

ATP, a molecule responsible for transporting energy throughout cells for metabolic processes.