No questions found
Which characteristic do all living organisms show?
514
556
543
The diagram shows some animal cells, as seen under the microscope. What will be present at X?
582
541
575
Which structures are present in large numbers in cells with high rates of metabolism?
564
525
525
The diagram shows a section through a root.
What are the levels of organisation of the labelled structures?
500
508
506
Which characteristics are correct for both osmosis and diffusion? [Table_1]
540
537
554
The bases on one of the strands of a DNA molecule have the sequence shown. A-A-T-C-T-G
What is the corresponding sequence of bases on the other strand?
541
554
571
Which statement describes the effect of temperature on enzymes?
529
556
540
Four test-tubes are set up as shown. Which test-tube contains the most carbon dioxide after one hour?
531
523
598
The diagrams show the structure of four different cells from the leaf of a dicotyledonous plant.
Which cell is a guard cell?
596
564
536
Which mineral ion is absorbed by plant roots and used in the production of all amino acids?
500
584
590
Statements 1–4 describe stages in the development of cholera.
1. Chloride ions are secreted in the gut.
2. Osmosis causes water to move into the gut.
3. The infected person becomes dehydrated.
4. Toxins are produced by the pathogenic bacteria.
What is the correct sequence of the four stages?
522
565
508
The diagram shows a person's teeth. Some of their teeth are missing.
What would the person find difficult?
555
503
595
The graph shows the effect of pH on the activity of three different enzymes.
The table shows the pH of different parts of the alimentary canal.
[Table_1]
Which enzymes in the graph are likely to be protease enzymes?
565
554
516
The diagram shows a villus. Structures P and Q absorb different products of digestion.
Which row identifies the products absorbed by P and Q?
558
572
517
The diagram shows a leaf attached to the stem of a plant. What do the arrows at X represent?
501
599
562
Which row shows what is carried, and in which direction, by the pulmonary vein? [Table_1]
567
547
567
Which component of the blood produces antibodies?
517
566
517
Which statement about antibodies is correct?
580
577
546
Which row shows the correct combination of muscle contractions and the pressure in the thorax when breathing out?
[Table_1]
588
527
595
Which is not involved in removing the oxygen debt after a human has been exercising?
576
507
509
A longitudinal section of the kidney and some associated structures have been labelled. Which labelling is correct?
576
505
559
The diagram shows a synapse. What do the dots at X represent?
544
584
549
Which is the light sensitive part of the eye?
583
528
517
Which row shows the effects of excessive alcohol consumption?
[Table_1]
593
561
577
Dianthus flowers can be one of three different colours: red, pink or white.
A red flower is always homozygous and a white flower is always homozygous. Pink flowers are heterozygous.
If a red and a white flower are crossed, what percentage of the offspring will be pink?
592
594
522
The diagram shows the ovary of a flower.
Which process is shown in the diagram?
596
527
584
Some men do not produce healthy sperm cells. A couple may choose to use the sperm of another man, a donor, in order for the woman to get pregnant. Which procedure involves inserting sperm into the vagina of a woman from a donor?
501
571
542
Which blood component is destroyed in people who are HIV positive?
508
533
577
Four of the processes involved in the production of a protein are shown.
1. mRNA attaches to a ribosome.
2. mRNA moves to the cytoplasm.
3. The ribosome assembles amino acids into a protein molecule.
4. An mRNA copy of the gene is made.
In which sequence do these events normally occur?
542
525
555
Which statement about the sex chromosomes is correct?
540
564
510
Which row best describes human blood groups? [Table_1]
507
539
540
The diagram represents part of an aquatic food web.
Which organisms are primary consumers in this food web?
510
583
544
The diagram shows part of the water cycle.
What are processes S and T?
517
550
524
The graph shows the changes in the populations of predator and prey over a period of time. Which point on the graph shows a decrease in predator population?
529
590
529
Which is an example of genetic engineering?
571
554
531
Why is yeast used in breadmaking?
513
596
574
The graph shows the levels of dissolved oxygen and mineral ions in a river. At which point does raw sewage enter the river? [Graph of dissolved oxygen and mineral ion levels along a river shown with points A, B, C, D]
509
518
597
