Cells As The Basic Units Of Living Organisms

Which structural feature is found in mitochondria and chloroplasts but NOT in the nucleus of a eukaryotic cell?

A cell biologist examines a cell under an electron microscope and observes extensive flattened membrane sacs studded with small dark dots, located near a structure with a double membrane and pores. Which organelle is being observed?

Which statement correctly describes the function of the nucleolus?

A scientist isolates an organelle that has a double membrane, contains 70S ribosomes, circular DNA and stacks of internal membranes called grana. The organelle is most likely a:

Which feature is present in a typical plant cell but absent in a typical animal cell?

A student writes: “The plant cell membrane is rigid and made of cellulose, providing support.” Which correction best identifies the error?

A muscle cell requires large amounts of ATP for contraction. Which organelle would you expect to be most abundant, and why?

Which of the following correctly describes the structure of a typical bacterial cell?

Which statement about viruses is correct?

Cells lining the small intestine are specialised for absorption. Which combination of features would best support this function?

Which structure is correctly paired with its function?

A light microscope has a maximum useful magnification of about ×1500 and resolution of about 200 nm. Which structure would be visible under a light microscope but NOT resolved in detail without an electron microscope?

Which statement comparing prokaryotic and eukaryotic cells is correct?

A virologist studies a newly discovered virus and finds that its outer layer fuses easily with cell membranes during entry. Which feature explains this behaviour?

Why is ATP described as the “energy currency” of cells, and where is most of it produced?