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What are characteristics of all living organisms?
515
529
533
Using the binomial system, the name of a lion is \textit{Panthera leo}.
Which statement is correct?
530
526
508
Which feature would place organisms into the crustacean group of arthropods?
598
541
529
The diagram shows the structure of a palisade cell from a leaf. Which structure contains chlorophyll?
541
507
503
A bacterial cell has a length of 40 mm when it is magnified by \times 20\,000.
What is the actual length of the bacterial cell?
504
533
557
Which diagram shows the appearance of a plant cell after it is placed in pure water?
572
592
556
What would lead to a decrease in diffusion rate into a cell?
537
572
580
Which row shows the chemical elements contained in fats? [Table_1]
568
553
537
Glycogen is a large molecule made from smaller molecules. Which smaller molecules is glycogen made from?
511
520
543
The diagrams represent an enzyme and its substrate. Which part of the enzyme molecule is the active site for this substrate?
546
532
575
What is a use of the carbohydrates made by photosynthesis?
508
543
595
The diagram shows an experiment investigating the effect of light intensity on an aquatic plant. Photosynthesis occurred in both test-tube P and test-tube Q. Both test-tubes were kept at the same temperature. The number of bubbles produced in test-tube P was 12 bubbles per minute. What is the most likely number of bubbles produced in one minute in test-tube Q?
573
549
597
Which human teeth are used for biting and cutting food?
555
526
549
The diagram shows part of the human digestive system. Which organ produces hydrochloric acid?
587
600
504
Which part of a balanced diet is missing if a person develops rickets?
580
532
589
By which process is water vapour lost from a leaf?
537
542
553
The pathway taken by water through a plant is shown.
root hair cells \rightarrow root cortex cells \rightarrow Z \rightarrow mesophyll cells
Which part of the pathway is Z?
564
574
567
Which statement about the human circulatory system is correct?
552
580
519
What are features of arteries?
1. narrow lumen
2. thick muscular wall
3. walls made of a single layer of cells
4. wide lumen
544
545
517
What are disease-causing organisms?
506
582
530
Which row shows the composition of expired air from a healthy person? [Table_1] Table Contents: | | carbon dioxide % | oxygen % | water vapour | |--------------|------------------|----------|--------------| | A | 0.04 | 21 | saturated | | B | 0.04 | 16 | variable | | C | 4 | 21 | variable | | D | 4 | 16 | saturated |
513
565
512
What is the path of carbon dioxide as it leaves the lungs?
571
510
513
Which statement about anaerobic respiration is correct?
554
591
587
What is described as a ball of cells that implants into the lining of the uterus?
600
560
554
The diagram shows parts of the body involved in excretion in humans. What are the labelled parts?
515
589
583
The diagram shows a reflex action when a person touches a hot object and pulls their hand away. Which letter correctly identifies a structure?
524
578
580
The diagram shows a section through a human eye. Which structure changes shape in response to adrenaline?
513
547
547
What is an example of a population?
503
563
545
Which statement about antibiotics is correct?
560
548
515
A pea plant with the genotype YY is crossed with a pea plant with the genotype yy. What are the possible genotypes of the offspring?
573
528
548
Which graph shows the effect of temperature on the rate of respiration in yeast?
512
538
536
What is the correct description of asexual reproduction?
508
562
532
The diagram shows a human female’s reproductive organs.
Where does fertilisation usually occur?
527
517
548
The diagram shows part of a genetic diagram for the inheritance of sex in humans. The sex chromosomes in two gametes are shown. What are the sex chromosomes in gametes 1 and 2?
511
564
578
Tusks are modified teeth.
In one part of the world, most elephants used to be born with tusks. Over the last 50 years, more female elephants have been born without tusks. These elephants are giving birth to offspring that also do not have tusks.
Which types of variation can be illustrated by this example? [Table_1]
577
506
519
The diagrams show pyramids of numbers and biomass. Which pyramids could be pyramids of biomass?
561
557
535
Which process transfers energy between the first and second trophic levels of a food chain?
540
599
569
The diagram shows part of the carbon cycle. Which arrow represents respiration?
554
504
589
Why are bacteria useful in biotechnology and genetic modification?
514
521
528
What is a reason for inserting genes into bacterial cells?
535
522
570
