The correct answer is option (B) lemon juice.
pH refers to the logarithmic scale used to indicate the acidity or basicity of an aqueous solution. It is the negative of the base 10 logarithm of the activity of the hydrogen ion. Solutions with a pH less that 7 are considered acidic and the solutions with a pH greater that 7 are considered to be basic. A pH of 7 is neither an acid nor a base and is considered neutral.
An acid has a high concentration of hydrogen ions (H+) and a base has a low concentration of hydrogen ions. Higher the hydrogen ion concentration, pH is acidic. Among the given substances, lemon juice has a pH of 2, urine has a pH of 6, tomato juice has a pH of 4 and black coffee has a pH of 5. Since lemon juice has a pH of 2, it has the lowest –OH ion concentration.
The type of bonds that are involved in these transient protein - DNA interactions include: IONIC BOND, VANDER WAAL FORCES AND HYDROGEN BOND.
Protein - DNA interaction occur when a protein bind to DNA molecule; this reaction usually occur in order to regulate the function of DNA, especially that of expression of genes. Protein interaction with DNA may be specific or non specific.
Answer:
One or two molecules can make up simple carbohydrates