AQA A-Level Biology CH4. Cell Structure (includes RPA Qns)

Give 2 (two) functions of the cell-surface membrane.

• prevents the cell from changing shape

• regulate movement of substances into and out of the cell

• supports the structure of the cell

• respond to chemicals like hormones

The diagram is of a cell nucleus. Name the structures labelled A

• nuclear envelope

• nucleolus

• chromatin

• nuclear pore

The diagram is of a cell nucleus. Name the structures labelled B

• nuclear envelope

• nucleolus

• chromatin

• nuclear pore

The diagram is of a cell nucleus. Name the structures labelled C

• nuclear envelope

• nucleolus

• chromatin

• nuclear pore

The diagram is of a cell nucleus. Name the structures labelled D

• nuclear envelope

• nucleolus

• chromatin

• nuclear pore

Describe the function of the nucleus.

• helps with the packing and modifying of proteins

• controls the substances that move into and out of the cell

• controls the cells activities by controlling the transcription of DNA

• helps in the separation of the spindle fibres that separate the chromosomes during cell division

Describe the appearance of the Golgi apparatus.

• group of fluid-filled membrane-bound flattened sacs

• double membrane with pores

• double membrane with stacks of thylakoid known as granum each sub-connected by lamella

• flattened sacs covered in ribosomes

What are the functions of a lysosome?

• to digest invading cells

• creates a layer of slime that helps protect bacteria cells from attack

• contains hydrolytic enzymes used to digest and destroy old organelles

• help make and transport hormones

Function - it synthesis and processes lipids. What is this organelle?

(a)  

What is an organ system?

• group of different tissues work together to perform a particular function

• group of different organs work together to perform a particular function

• group of cells work together to perform a particular function

• all of these answers