Topic 5: Energy, exercise and coordination - Edexcel A-Level Biology B quiz

In the fluid-filled stroma surrounding the thylakoids of the chloroplast

In the matrix of the mitochondrion alongside the Krebs cycle

Free in the cytoplasm of the cell, outside any organelle

In the thylakoid membranes of the chloroplast

The splitting of water (photolysis)

The carbon dioxide that diffuses into the leaf and is fixed in the Calvin cycle

The glucose made in the light-independent reactions

The ATP generated in the light-dependent stage

The mitochondrial matrix

The cytoplasm

The inner mitochondrial membrane

The thylakoid

Glycolysis in the cytoplasm of the cell

The link reaction that converts pyruvate to acetyl coenzyme A

Oxidative phosphorylation

The Krebs cycle in the mitochondrial matrix

Ethanol and carbon dioxide

Acetyl coenzyme A

Glucose

Lactate

Actin and myosin filaments slide past each other

The actin and myosin filaments themselves physically contract and shorten

The myofibrils dissolve away during the contraction

Calcium ions leave the muscle fibre into the blood

They directly break down ATP molecules to release energy for the heads

They expose binding sites on actin so myosin can attach

They cause the actin filaments to become physically shorter

They remove the neurotransmitter from the synaptic cleft

They maintain a much higher resting potential across the membrane

They contain a larger store of neurotransmitter at each synapse

The impulse jumps between nodes of Ranvier

They are always far thinner than unmyelinated neurones

By an electrical current physically jumping straight across the synaptic gap

By the actin and myosin filaments sliding across the gap

By active transport of sodium ions directly across the synaptic gap

By a neurotransmitter diffusing across and binding to receptors

Reabsorb more water, producing concentrated urine

Produce a large volume of very dilute, watery urine instead

Stop filtering the blood at the glomerulus altogether

Excrete a much greater quantity of glucose in the urine