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(A) Osmosis (B) Filtration (C) Diffusion (D) Active transport 3 Which of the following is a plant adaptation that minimises water loss


Academic year: 2023

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1 Exposure to radiation such as X-rays can change the sequence of bases in DNA What is this called? Bacteria that produce insulin as a result of genetic engineering (D) Bacteria in the mouth that prevent the growth of harmful bacteria 6 An organ of the body is shown. Refer to the plant tissue diagram shown to answer questions 8 and 9. 8 What is the most appropriate title for this diagram.

A longitudinal section of xylem and phloem tissue 9 What is the width of cell Y. 10 Why do co-dominant alleles NOT produce simple Mendelian ratios. 11 What is a likely negative impact of the development of bacteria on the management of infectious diseases. The nutrient broth was not boiled thoroughly on day 1. D) The nutrient broth was both exposed to oxygen from the outside air.

14 The current theory to explain the movement of materials in the phloem of a living plant involves the following steps: Which of the following is correct about the inheritance of Goltz syndrome in these children. The graph shows the antibody levels in the blood for that particular pathogen over the following 28 days for each person.

19 What is the best explanation for the fact that the fish survive a gradual temperature change, but not a rapid temperature change.

5 marks)

Use labeled diagrams to distinguish between the structure of an artery and that of a capillary. Sketch how a vaccine against malaria would prevent the occurrence and spread of the disease in a population. DO NOT write in this area.. Explain how Darwin/Wallace's theory of evolution explains convergent evolution through natural selection and isolation.

The experiment lasted for two hours. a) The carbon dioxide concentrations rose in each of the incubators.

Sketch line graphs on the axes below to predict the body temperature data that would be collected in each setup. Rennin coagulates the milk that the mammal drinks and enables milk solids to stay longer in the stomach for further digestion. The students then added rennin to each milk sample and recorded the time it took for the milk to solidify. a) Give an account of the students' calculated average time for 300 bubbles of CO2.

Scientists have tried to achieve a viable embryo by joining two eggs (eggs) from the same female. Explain whether the offspring produced using this process would be a clone of the female whose two eggs were used.

8 marks)

Part B extra writing space

  • Communication (25 marks)
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  • Biotechnology (25 marks)
  • continues on page 29
  • Genetics: The Code Broken? (25 marks)
  • continues on page 31
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Start each part of the question on a new page. a) The biological structure shown is part of one of the systems in the body. ii) Outline the steps involved in this system's response to a stimulus. The field of view is the part of the 360° view of the environment that the animal can see when looking straight ahead. Visual fields can be mapped according to which eye provides vision in each part of the visual field.

The diagram also shows how the position of the eyes on the skull affects the visual field map. i). Use the data to describe the relationship between the position of the eyes in the head and the visual fields of the animal. ii) Explain the effects of the loss of one eye on a monkey's vision and its chance of survival. e) Sound is a versatile form of communication. It relies on the successful transmission of signals between individuals of the same species, as well as of different species, for a purpose.

If there are doubts about the damage that can be caused by an activity, the proponents of the activity must prove that the damage is not significant for society and the environment. Evaluate ONE's specific biotechnology use ethics in relation to this framework. Name the segment of DNA shown in the diagram. ii) Outline the ability of DNA to repair itself.

Acknowledgment: Reproduced with permission from the University of California, Museum of Paleontology Homologous genes - http://evolution.berkeley.edu/evolibrary/article/1_0_0/eyes_10. e) The text below summarizes some recent scientific experiments. This gene shuts down one of the two X chromosomes so they don't function excessively in normal human females. Start each part of the question on a new page. a) (i) Name a characteristic used to classify people as gay. ii) Outline the difficulties in interpreting fossil data.

Identify the TWO general trends shown in the graph. ii) Explain the evolutionary significance of a named example of polymorphism (other than skin color) in humans. Start each part of the question on a new page. a) (i) Name a 17th or 18th century scientist who contributed to 1 the development of ideas about plant growth. ii) Outline how the results of a 17th or 18th century experiment 3 led to a conclusion about plant growth. The collected data is shown in the table. i) Write the chemical formula for each of the trace elements used in experiment 1 and experiment 2.

In your answer, clearly state the tracer used in each of the experiments. ii) Explain the results of Experiment 1 and Experiment 2 with specific reference to the data. e). Also in large liquid cultures, microalgae on the surface of the culture deny light energy to algae located deeper in the liquid.


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