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A living organism, X, can make its own food, get rid of toxic materials and detect and respond to stimuli.
What other four processes must organism X carry out to stay alive?
569
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585
The diagram shows an animal.
Using the key, which genus does the animal belong to?
has jointed legs
|
|
|
|
------------|------------
three pairs more than three
of legs pairs of legs
----|---- -----|-----
has tail no tail four pairs more than four
of legs pairs of legs
541
588
532
Which statement is true for all species of organisms?
517
522
598
Which group of living organisms includes the myriapods?
503
574
561
The diagram shows a liver cell.
Which features are present in this cell and also in most plant cells?
596
573
536
A tick is a type of arachnid.
The length of an adult tick is 2.3 mm.
What is the length of the tick in micrometres?
546
548
579
Cylinders of potato tissue were left in different concentrations of sucrose solution for one hour. The graph shows the percentage change in the length of the potato cylinders after one hour.
What can be concluded about the cells of the potato cylinders that were left in $0.2 \, \text{mol dm}^{-3}$ sucrose solution?
509
529
526
Which statement about biological molecules is correct?
567
506
571
The graph shows how temperature affects an enzyme-controlled reaction.
Where on the graph do the enzyme and substrate molecules have the most kinetic energy?
536
500
530
Which substance is an energy store that is made in plant cells from the products of photosynthesis?
509
547
528
Which nutrient is lacking when a person has scurvy?
545
593
503
The diagram shows part of the alimentary canal.
Which row correctly identifies the structures labelled J to M?
[Table_1]
563
571
559
Which statement about enzymes in digestion is correct?
520
500
590
The diagram shows a villus.
Which statement about absorption is correct?
504
539
503
Which substance strengthens the walls of xylem vessels?
523
563
538
Which row explains why a plant wilts?
[Table_1]
598
518
576
Scientists investigated the movement of sucrose through a plant.
They used carbon dioxide containing radioactive carbon, $^{14}C$.
They covered one leaf on a plant with a clear plastic bag containing $^{14}CO_2$.
After 24 hours, the plant was placed onto photographic film. The photographic film went black where the radioactive carbon was present.
Diagram 1 shows the plant at the start of the experiment, and diagram 2 shows the photographic film at the end of the experiment.
Which conclusions can be made from the experiment?
1. Translocation occurs in upwards and downwards directions.
2. The leaf and shoot tip are sources.
3. The roots and flowers are sinks.
537
519
520
The diagram shows a section through the human heart.
Which valve is the right atrioventricular valve?
510
592
546
Which row shows the features of a blood vessel that transports blood at low pressure?
[Table_1]
557
520
504
The diagram shows a component of blood.
What is the name of this component?
576
590
597
Which statement about immunity is correct?
561
570
520
The intercostal muscles and diaphragm contract and relax during ventilation.
Which row shows the actions of muscles that result in the largest volume inside the thorax?
[Table_1]
542
518
535
How many molecules of carbon dioxide, glucose, oxygen and water are there in the balanced chemical equation for aerobic respiration?
[Table_1]
504
566
514
Where is urea formed and excreted?
[Table_1]
546
537
521
A growing seedling was pinned sideways onto a wooden board that was covered in wet blotting paper.
The seedling was kept in a dark box.
The diagram shows the seedling after 24 hours. Auxin had become concentrated on the lower side of the shoot and the root.
What can be concluded from this experiment about the effect of auxin on the seedling?
503
560
557
Which statement describes a drug?
593
509
562
The diagram shows a plant that is producing small plantlets.
Which statement about the plantlets is correct?
566
509
536
Which hormone maintains the thickness of the lining of the uterus during pregnancy?
571
560
585
The table shows the number of new HIV infections in 1990 and 2021 in one country.
[Table_1]
Which statement could explain the change in the number of new HIV infections between 1990 and 2021?
567
507
551
Where are amino acids assembled into protein molecules?
542
567
551
The diagram shows the changes in the mass of DNA in one cell before, during and after mitosis.
What is happening at X in the graph?
516
503
574
A woman who has blood group AB has a child with a man who has blood group B and is heterozygous.
What is the chance of the child having blood group B?
564
542
513
Plants are adapted to survive in different environments.
What are features of xerophytes?
[Table_1]
559
546
560
Which diagram correctly shows the flow of energy?
537
523
512
The diagram shows a food chain.
tree $\rightarrow$ small insects $\rightarrow$ small birds $\rightarrow$ birds of prey
What is the correct pyramid of numbers for this food chain?
538
500
534
Acidic soils encourage the increase of anaerobic bacteria that cause denitrification.
How do acidic conditions affect the nitrogen cycle?
525
559
591
The graph shows the population of yeast over a period of time.
Which phase shows when the number of yeast cells dying is equal to the number of new yeast cells being produced?
578
580
523
Wheat plants are often grown in large areas as a monoculture.
What is a negative environmental impact of this method of farming?
582
542
551
How will these natural processes be affected by deforestation?
[Table_1]
562
555
524
The stages describe how genetic modification can be used to produce human insulin from bacteria.
1. Cut bacterial plasmid DNA with restriction enzymes.
2. Extract the gene for insulin from human DNA with restriction enzymes.
3. Insert the recombinant plasmids into bacteria.
4. Join human DNA to bacterial plasmid DNA using DNA ligase.
5. Replicate bacteria containing recombinant plasmids.
Which sequence will lead to the production of human insulin by bacteria?
509
574
530
