Eukaryotic Cell Structure

Which structure found in eukaryotes has a single membrane?

• Nucleus

• Lysosome

• Chloroplast

• Mitochondrion

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?

• A

• B

• C

• D

Which pair of organelles has internal membranes?

• chloroplasts and mitochondria

• chloroplasts and nuclei

• mitochondria and ribosomes

• nuclei and ribosomes

Ribosomes exist as separate subunits.

What do these subunits consist of?

• mRNA and lipid

• mRNA and tRNA

• rRNA and lipid

• rRNA and protein

What is the function of nucleoli?

• formation and breakdown of the nuclear envelope

• formation of centromeres

• formation of ribosomes

• organisation of the spindle during nuclear division

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

• A

• B

• C

• D

Which cell organelle does not contain DNA?

• chloroplast

• Golgi apparatus

• mitochondrion

• nucleus

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

• Golgi apparatus

• Smooth endoplasmic reticulum

• Rough endoplasmic reticulum

• Lysosome

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

• Cytoplasm

• Mitochondrion

• Nucleus

• Chloroplast

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

• High rate of protein processing

• High rate of absorption

• High rate of photosynthesis

• High rate of movement