The electron micrograph shows part of a palisade mesophyll cell. Which of the labelled structures controls the exchange of substances to and from the cell?

Which pair of organelles has internal membranes?

Ribosomes exist as separate subunits.

What do these subunits consist of?

What is the function of nucleoli?

The diagram shows the ultrastructure of a typical animal cell. Which structure synthesises and transports lipids and steroids?

Which cell organelle does not contain DNA?

Which organelle is involved in generating vesicles destined for the cell membrane?

The image shows an electron micrograph of mesophyll cells. What is the name of the structure labelled X?

The micrograph shows part of a cell. Which principal function is this cell likely to have, as judged by its cell structure and organelles?

Pancreatic gland cells produce and secrete large amounts of digestive enzymes. Which organelles would you expect to be present in higher than normal amounts in such cells?

The image shows an electron micrograph of part of a cell. Which features do the two structures labelled X and Y have in common?

The diagram is taken from an electron micrograph of a pancreatic exocrine cell which secretes digestive enzymes. Where are these enzymes made?

Which raw material is utilised by ribosomes?

An actively growing cell is supplied with radioactive amino acids. Which cell component would first show an increase in radioactivity?

The action of which cell depends on large numbers of lysosomes?

Which part of the cell is often continuous with the rough endoplasmic reticulum?

Which size of ribosome is found in mitochondria?

What are found in both chloroplasts and mitochondria?

Which organelle does not contain a partially permeable membrane?