Many Algae and Protozoans Evolved Mineralized Skeletons

question 33

Multiple Choice

Many algae and protozoans evolved mineralized skeletons. Which of the following is the MOST likely explanation for this?

• A)These minerals are needed as cofactors for enzymes needed in photosynthesis.
• B)These minerals are needed as cofactors for enzymes needed in cellular respiration.
• C)These skeletons allow for more complex reactions to take place inside the cell.
• D)These skeletons probably afforded them protection from being eaten.
• E)These minerals are necessary to maintain genome integrity.

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Definitions:

Structure

Refers to the arrangement of atoms within a molecule, including their spatial orientation and any form of bonding or connectivity between them.

C≡C Stretch

A vibrational motion observed in IR spectroscopy, characteristic of the carbon-carbon triple bond stretching.

C≡N Stretch

A spectroscopic term referring to the absorption frequency characteristic of the triple bond between carbon and nitrogen atoms in nitriles, observable in infrared or Raman spectra.

IR Band

A specific frequency range within an infrared spectroscopy spectrum that corresponds to the vibration of molecular bonds, used for chemical identification.