Question

Reconstruction of ancestral nucleotide and protein sequences suggest

(there might be more than 1 correct anwer)

A. That the Last Universal Common Ancestor was an extreme thermophile

B. That the ancestors of the archaeal and bacterial domains were thermophiles

C. That the ancestors of the archaeal and bacterial domains lived at higher temperatures  than the Last Universal Common Ancestor

Answer 1

Ancestral sequence reconstruction.also called (ASR) technique used to study the molecular evaluation

a 'phylogenetic tree' is constructed with statistically inferred sequences at the nodes of the branches. It is these sequences that are the so-called 'ancestors'

reconstruction :the process of synthesising the corresponding DNA, transforming it into a cell and producing a protein is the called reconstruction

ASR has been applied to resurrect a number of different ancient enzymes. Among the first studied examples were translation elongation factors from organisms that thrived ∼3.5–0.5 billion years (Gyr) ago

The thermal stabilities of the proteins declined from the “older” to the “younger” proteins, indicating that the environmental temperature decreased by 30 °C within this period of time.

This conclusion is supported by a nearly identical cooling trend for the ancient ocean as inferred from the deposition of oxygen isotopes