Which of the Following Pairs of Amino Acids Contains Both

question 21

Multiple Choice

Which of the following pairs of amino acids contains both an aliphatic and an aromatic amino acid?

• A)Thr and Tyr
• B)Val and Gln
• C)Phe and Ile
• D)Ser and Cys
• E)none of the above

---

Definitions:

Macroevolution

Macroevolution is evolution occurring above the species level, including the origination, diversification, and extinction of species over long periods of evolutionary time.

Non-Avian Dinosaurs

The group of dinosaurs that did not evolve into birds and became extinct approximately 66 million years ago.

Mass Extinctions

Events in Earth's history when a significant, widespread and rapid decrease in the biodiversity of organisms occurs, often due to drastic environmental changes.

Mass Extinction

A significant and widespread event in which a substantial proportion of Earth's species die out in a relatively short geological period.