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Golf. But a single game of golf is usually referred to as a round.
The term for a single page in a book, often referred to as a "book leaf," is called a "folio."
single use
generally single celled organisms are referred to as bacteria
Mutations that occur at one single nitrogen base are referred to as a point mutation.
field
A single layer with consistent characteristics is referred to as a stratum.
A hydrogen ion is often referred to as a proton due to its single positive charge.
I believe it is called a monopoly.
UnicellularA single-celled organism is called unicellular.Examples of unicellular organisms are bacteria and protozoa.
Single cream is a type of dairy cream with a lower fat content than heavy cream. In the United States, it is commonly referred to as light cream.