[Campbell Biology P.199] A cell performs three main kinds of work, each powered by energy co... | Practice Question

A cell performs three main kinds of work, each powered by energy coupling, primarily through ATP. Which of the following examples correctly matches the type of cellular work with its description? Select all that apply.

  • A: Chemical work: synthesis of polymers from monomers.
  • B: Transport work: pumping substances across membranes against their spontaneous movement.
  • C: Mechanical work: contraction of muscle cells.
  • D: Transport work: movement of chromosomes during cellular reproduction.

Explanation

The text defines three types of cellular work: Chemical work involves pushing endergonic reactions like polymer synthesis . Transport work involves pumping substances across membranes against their spontaneous movement. Mechanical work involves physical movement, such as muscle contraction, cilia beating, and chromosome movement during cell reproduction. Option D incorrectly categorizes chromosome movement as transport work when it is mechanical work.