Nucleotides contain sugar, a phosphate group, and a nitrogen base. Which of the following is a nitrogen
base?
deoxyribose
guanine
tyrosine
ribose
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The answer is Guanine
The nitrogen base among the given options is guanine.
The nitrogenous bases are the key components of nucleotides. They include adenine (A), guanine (G), cytosine (C), thymine (T) in DNA, and uracil (U) in RNA. From the given options, guanine is a nitrogenous base, which is one of the building blocks of nucleic acids.
To arrive at this answer, you can recognize that deoxyribose and ribose are types of sugars, while tyrosine is an amino acid and not a nitrogenous base. Hence, the correct answer is guanine.