Question

question 21 of 25
mechanical work
transport work
chemical work
answer bank
linking of amino acids to form a protein
active transport of k⁺ and na⁺ ions across a cell membrane
beating of a flagellum
synthesis of dna from nucleotide components
contraction of a muscle cell
pumping of protons against a concentration gradient across a cell membrane

Explanation:

Mechanical work involves physical movement or change in position. Beating of a flagellum and contraction of a muscle cell are examples of mechanical work as they involve movement. Transport work is related to the movement of substances across membranes against their concentration gradients. Active transport of K⁺ and Na⁺ ions across a cell membrane and pumping of protons against a concentration gradient across a cell membrane are transport work. Chemical work involves the making and breaking of chemical bonds. Linking of amino - acids to form a protein and synthesis of DNA from nucleotide components are chemical work.

Answer:

Mechanical work: beating of a flagellum, contraction of a muscle cell
Transport work: active transport of K⁺ and Na⁺ ions across a cell membrane, pumping of protons against a concentration gradient across a cell membrane
Chemical work: linking of amino acids to form a protein, synthesis of DNA from nucleotide components