### Cell Structure And Function-Biomolecules Topic

**Numerical Shortcuts and Tricks**

**Numerical 1:**

- To calculate the number of mitochondria in a human liver, multiply the average number of mitochondria per cell
**(100)**by the total number of cells in the liver**(2 trillion)**. - Use scientific notation to express the answer
**(200 trillion mitochondria)**.

**Numerical 2:**

- To determine the molecular weight of a typical protein, multiply the molecular weight of an average amino acid
**(110 g/mol)**by the number of amino acids in a typical protein**(500)**. - The answer is expressed in grams per mole
**(55,000 g/mol)**.

**Numerical 3:**

- To calculate the number of nucleotides in the human genome, divide the total length of human DNA
**(2 meters or 2 x 10^9 nanometers)**by the distance between two adjacent nucleotides**(0.34 nanometers per nucleotide)**. - Use scientific notation to represent the answer
**(5.9 x 10^9 nucleotides)**.

**Numerical 4:**

- To determine the number of nucleotides in a specific RNA molecule, divide its molecular weight
**(1.5 million g/mol)**by the average molecular weight of a nucleotide**(330 g/mol)**. - The result represents the total number of nucleotides in the RNA molecule
**(4545 nucleotides)**.