No questions found
Which characteristics of all living organisms are needed to release energy for growth?
526
549
537
Two animals have an identical sequence of amino acids in one of the proteins found in their cells. What does this indicate about these animals?
561
599
517
Which row shows the structure on the outside of a plant cell and the location of the chloroplasts in the cell?
[Table_1]
569
518
571
The length of a mitochondrion in a photomicrograph is 15 mm.
The actual length of the mitochondrion is 3 $\mu$m.
What is the magnification of the photomicrograph?
546
560
506
The diagram shows some cells.
Where are these cells found?
558
577
574
Which statement about turgor pressure is correct?
533
594
511
Which words complete the definition of diffusion?
'Diffusion is the net movement of particles from a region of their ......1..... concentration to a region of their ......2...... concentration, ......3...... a concentration gradient.'
[Table_1]
527
588
581
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?
563
578
502
In a photosynthesis experiment, a plant is left in bright sunlight for several hours. A leaf is then removed from the plant and tested for starch, using iodine solution.
The diagram shows the leaf from the plant that was used in the experiment.
Which diagram shows the result of the experiment?
571
516
552
An experiment was carried out to investigate the effect of pH on enzyme action. The graph shows the results.
What are the labels for the x-axis and the y-axis?
525
522
556
Four test-tubes were set up as shown in the diagram.
In which test-tube is the starch digested most quickly?
599
571
500
Two similar leaves are set up in test-tubes as shown. One is exposed to light, while the other is kept in the dark. After a few hours, which colour would the hydrogencarbonate indicator solution be in each test-tube?
588
517
567
Which food is the best source of vitamin C?
500
503
510
The diagram shows part of the human alimentary canal and associated organs.
Which structure produces hydrochloric acid?
547
595
575
The diagram shows a large food molecule changing into smaller molecules.
What is process X?
556
584
510
The diagrams show sections of a leaf and a root.
Which two labelled structures identify xylem?
550
513
527
What holds the water molecules together during the transpiration pull in the xylem?
507
553
567
Which component of blood produces antibodies?
537
548
588
What is the function of the septum in the heart?
587
524
588
What causes the air pressure in the lungs to decrease during breathing in?
547
548
591
Some features that help to defend the body against pathogens are listed.
1. mucus
2. skin
3. stomach acid
4. phagocytosis
Which features can prevent pathogens entering body tissues?
514
557
546
In a balanced chemical equation for aerobic respiration, what are the products?
573
593
515
The diagram shows the structure of part of a kidney tubule and associated blood vessels.
Which substances are normally present in the filtrate at X?
[Table_1]
518
502
534
Which situation is a voluntary action?
565
538
534
When we read a book, our eyes accommodate to view near objects. Which statement is correct when viewing a near object?
534
538
594
How does the body increase blood glucose concentration?
580
574
501
A seed is placed and grown on a rotating disc, as shown.
Which diagram shows the appearance of the seedling shoot after seven days?
513
587
520
Which hormone stimulates the release of an egg from the ovary during the menstrual cycle?
588
556
523
Some descriptions of different human cells are listed.
1. contains 46 chromosomes
2. haploid nucleus
3. diploid nucleus
4. contains one set of unpaired chromosomes
Which descriptions are correct for the nucleus of a human gamete?
512
549
535
Which adaptive feature is only found in female gametes?
530
542
558
A man of genotype $I^A I^B$ and woman of genotype $I^B I^O$ have a child.
What is the chance that the child will have the same blood group as one of its parents?
593
579
503
The diagram shows a section through the leaf of a water lily.
Water lilies are hydrophytes. They have larger air spaces than most other plants. How does this adaption help the lily to survive?
600
509
585
A species of insect usually has pale-coloured wings. This helps to camouflage them on pale-coloured tree trunks. A few of the insects in this species have darker coloured wings. After a number of years the tree trunks become darker in colour due to environmental changes. The insects with dark-coloured wings become more common than insects with pale-coloured wings in this species. Which process causes this change in the proportion of insects with dark-coloured wings?
522
564
552
The graph shows the growth curve for a population of bacteria.
The table identifies each phase shown in the graph.
Which row is correct?
516
587
548
Bacteria can be genetically engineered to produce human protein.
What happens during this process?
532
509
517
Human insulin is a protein that can be made by genetically engineered bacteria. This involves the transfer of genetic information to bacteria.
The diagrams show cells and parts of cells involved in this process.
What is the correct order of transfer of genetic information?
586
538
595
What is an effect of an increase in the use of insecticides?
511
506
506
The graphs show changes that occur in a lake during the process of eutrophication.
What are the labels for W, X and Y?
581
527
560
