Currently, Two of the Living Elephant Species (X and Y)

question 34

Multiple Choice

Currently, two of the living elephant species (X and Y) are placed in the genus Loxodonta, and a third surviving species (Z) is placed in the genus Elephas. Assuming this classification reflects evolutionary relatedness, which of the following is the most accurate phylogenetic tree?

---

Definitions:

G Protein

A class of proteins that act as molecular switches inside cells, involved in transmitting signals from various stimuli outside a cell to its interior.

Receptor Molecules

Proteins located on the cell surface or within cells that bind specific substances, triggering a biological response.

Up-regulation

refers to the process of increasing the response to a stimulus, often involving an increase in the number of receptors on a cell's surface.

Receptor Sites

Specific locations on cell surfaces or within cells where molecules, such as hormones or neurotransmitters, bind to elicit a response.