The thermoacidophile Sulfolobus acidocaldarius lacks peptidoglycan, but still possesses a cell wall. Which of the following statements is likely to be an accurate description of this species?
a. The optimal pH of its enzymes will lie above pH 7.
b. It is a bacterium.
c. It could inhabit hydrothermal springs.
d. It could inhabit alkaline hot springs.

c and d

Explanation:

A species of an organism with cell wall that lacks peptidoglycan is definitely not a bacterium because bacterial cell walls usually have peptidoglycan.

One particular group of organisms whose cells have cell walls but lack peptidoglycan is Archaea.

Archaea represents a group of prokaryotes that are able to survive in extreme conditions such as high temperature, pressure and salinity. As such, they could inhabit hydrothermal springs as well as alkaline hot springs.

Hence, thermoacidophile Sulfolobus acidocaldarius is likely to be an Archaea and could inhabit both hydrothermal springs and alkaline hot springs.

The correct option is option c and d.

the answer will be a) proteins i believe

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