Biology - IA Applied Science

Which statement best explains the data?

Type of cell Number of mitochondria

Liver 1500

Heart muscle 5000

Skin 100

• Liver cells only respire using anaerobic respiration.

• Heart muscle cells produce more protein than other types of cell.

• Skin cells need large amounts of energy.

• Muscle contraction requires large amounts of energy.

What structures do prokaryotic and eukaryotic cells have in common?

• Cytoplasm and mitochondria

• Cell membrane and cytoplasm

• Mitochondria and nucleus

• Cell membrane and nucleus

Look at the palisade cell from a leaf. It is important for photosynthesis. Part X is where the chemical reactions of photosynthesis take place. Write down the name of the part X.

• Cell membrane

• Nucleus

• Chloroplast

• Cytoplasm

The picture is of an electron micrograph of another cell found in the leaf.

Explain how using electron microscopy has improved the understanding of structures inside cells.

Thyroxine is a hormone made by the thyroid gland in the neck. Describe how hormones are able to co-ordinate and control changes in the body. Describe the role of thyroxine and explain how the body controls the level of this hormone.

Chromosomes are made from a chemical called DNA.

Describe the structure of DNA.

Draw a labelled diagram.

Motor neurones are part of the nervous system. Write down the name of part X.

• Dendrite

• Cell body

• Axon

• Synapse

The drawing shows some of the structures found in an animal cell. Which labelled structure contains enzymes for cellular respiration?

• A

• B

• C

• D