How could changing one nucleotide of DNA (one letter) change a protein?

What can be found in every skeletal muscle? a. nerves, bones, cartilage, and connective tissue b. tendons, cartilage, nerves, and blood vessels c. muscle fibers, nerves, connective tissue, and blood vessels d. tendons, nerves, blood vessels, and bones

What are the formed elements (cell or parts of cell) in blood and what are their functions ?

Which of the following is a macronutrient? carbohydrates lipids amino acids all of the above