**Question:** All of the following abbreviations are true except a) AMP - Adenosine monophosphate; b) CMP - Cytidine monophosphate; c) GMP - Guanosine monophosphate; d) TMP - Thymine monophosphate; e) UMP - Uracil monophosphate.

**Core Concept:** Nucleotides and Nucleosides are the building blocks of nucleic acids (DNA and RNA). They are converted into nucleotides monophosphate (p) to form nucleotides triphosphate (t) and di-phosphate (d) for DNA and RNA synthesis.

**Why the Correct Answer is Right:** AMP (Adenosine monophosphate) is a correct abbreviation for adenine monophosphate, one of the nucleotides building blocks for DNA and RNA. All nucleotides include a nitrogenous base (like adenine, cytosine, guanine, and thymine), a five-carbon sugar (deoxyribose or ribose), and a phosphate group.

**Why Each Wrong Option is Incorrect:**

a) CMP (Cytidine monophosphate) is a correct abbreviation for cytidine monophosphate, another nucleotide building block for DNA and RNA. Nucleotides have a nitrogenous base (cytosine), a five-carbon sugar (ribose), and a phosphate group.

b) GMP (Guanosine monophosphate) is a correct abbreviation for guanosine monophosphate, a nucleotide building block for DNA and RNA. Nucleotides have a nitrogenous base (guanine), a five-carbon sugar (ribose), and a phosphate group.

c) TMP (Thymidine monophosphate) is a correct abbreviation for thymidine monophosphate, a nucleotide building block for DNA. Nucleotides have a nitrogenous base (thymine), a five-carbon sugar (deoxyribose), and a phosphate group.

d) TDP (Thymidine triphosphate) is a wrong abbreviation for thymidine triphosphate, a nucleotide building block for DNA. The correct abbreviation is TTP (Thymidine triphosphate) or TTP (Thymidine triphosphate). Nucleotides have a nitrogenous base (thymine), a five-carbon sugar (deoxyribose), and a phosphate group.

e) UTP (Uridine triphosphate) is a wrong abbreviation for uridine triphosphate, a nucleotide building block for RNA. The correct abbreviation is UTP (Uridine triphosphate). Nucleotides have a nitrogenous base (uracil), a five-carbon sugar (ribose), and a phosphate group.

**Clinical Pearls:**

1. The nucleotides building blocks for DNA are always denoted by TTP (Thymidine triphosphate) or TTP, not TDP (Thymidine diphosphate).
2. The nucleotides building blocks for RNA are denoted by UTP (Uridine triphosphate) or U