Active transport, vesicles and ATPEdexcel A-Level Biology B: Flashcards
What these 13 flashcards ask
- Define active transport.
- How does ATP drive active transport?
- Give two pieces of evidence that a process is active transport.
- What is endocytosis?
- What is exocytosis?
- What is phagocytosis?
- Does endocytosis need ATP?
- What happens to the surface area of the membrane during exocytosis?
- What are the components of ATP?
- Write an equation for ATP hydrolysis.
- What is phosphorylation of ADP?
- Why is ATP a good immediate energy source?
- Which enzyme synthesises ATP?
Exam questions on Active transport, vesicles and ATP
- Root hair cells absorb nitrate ions from soil water. The concentration of nitrate ions inside a root hair cell is often higher than in the soil water. Researchers found that when the cells were treated with cyanide, which stops respiration, nitrate uptake fell sharply.Explain why nitrate uptake falls when the root hair cells are treated with cyanide.2 marks
- Cells of the pancreas make digestive enzymes, which are packaged into vesicles and released from the cell. Neutrophils, a type of white blood cell, take in bacteria from the blood plasma and destroy them.Describe how a neutrophil takes in a bacterium from the blood plasma.2 marks
- ATP is the immediate source of energy for cell processes. A muscle cell holds only a small store of ATP, but during a sprint it uses ATP very quickly and regenerates it from ADP and inorganic phosphate using energy released in respiration.Describe how ATP provides energy for cell processes and how it is regenerated.3 marks
Written by the Exaim team, led by Shaun Daswani (Head of Upper Secondary, Improve ME Institute; MSc Financial Mathematics, Imperial College London; BSc, UCL) and Jason Daswani (operational lead, Improve ME Institute; LSE).