1028899
Descripción
Test por coffeelover, actualizado hace más de 1 año
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Creado por coffeelover
hace más de 10 años
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Pregunta 1
Pregunta
Infectious diseases can be spread when microbial experiments are conducted. Which of the following would be an effective barrier to stop this from happening?
Respuesta
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Using chlorinated water during the experiment
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Washing hands before performing the experiment
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Wearing plastic or latex gloves during the experiment
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Disposing carefully and safely of waste materials produced during the experiment
Pregunta 2
Pregunta
Antibodies are proteins that
Respuesta
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break down pathogens.
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bind with a specific antigen.
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catalyse biochemical reactions.
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are produced by T cells to kill disease-causing viruses.
Pregunta 3
Pregunta
Which of the following can cause an imbalance of microflora in humans?
Respuesta
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Overuse of antibiotics
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Excessive use of antiviral drugs
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Consumption of genetically modified foods
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Immunisation against different diseases
Pregunta 4
Pregunta
Which of the following prevents the entry of pathogens into the human body?
Respuesta
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Cell death to seal off a pathogen
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Mucus lining the respiratory tract
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Phagocytosis performed by B cells
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Destruction of pathogens by the lymphatic system
Pregunta 5
Pregunta
What is the genotype of pure breeding plants?
Respuesta
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Heterozygous
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Homologous
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Homozygous
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Monohybrid
Pregunta 6
Pregunta
What are the main components of the immune response involved in or
Respuesta
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Antibodies, T cells and B cells
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Antibiotics and white blood cells
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T cells, B cells and red blood cells
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Red blood cells, white blood cells and antigens
Pregunta 7
Pregunta
Vaccination can control the spread of
Respuesta
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a genetic disorder.
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an infectious disease.
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a nutritional deficiency.
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an environmental disease.
Pregunta 8
Pregunta
Sutton and Boveri contributed to our understanding of the importance of chromosomes. What was one of their findings?
Respuesta
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Chromosomes carry hereditary factors.
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Sex is genetically determined by chromosomes.
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Radiation can cause mutations in chromosomes.
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The structure of chromosomes is a double helix.
Pregunta 9
Pregunta
What is a feature of an estuarine organism (eg mangroves) that allows it to survive?
Respuesta
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High rate of salt excretion
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Low rate of osmosis into its cells
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High uptake of salt from its environment
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Low uptake of oxygen from its environment
Pregunta 10
Pregunta
What does the structure of arteries allow them to do?
Respuesta
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Transport oxygen rich blood
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Withstand high blood pressure
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Release carbon dioxide to the lungs
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Remove nitrogenous waste via the kidneys
Pregunta 11
Pregunta
Why are quarantine measures needed when there is an outbreak of an infectious disease in Australian farm animals?
Respuesta
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To prevent the spread of the disease to food imported into Australia
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To prevent Australian farm animals from becoming immune to the disease
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To prevent introduced plants threatening the survival of Australian farm animals
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To prevent the disease from spreading to farm animals in different regions of Australia
Pregunta 12
Pregunta
Two experiments were conducted where either cold air or hot air was blown continuously
onto a student’s legs while the skin temperature on the student’s arm was being measured. The graph shows the change in skin temperature on the arm of the student for each experiment. Which process best accounts for the trends shown in the graph?
Respuesta
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Diffusion
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Enantiostasis
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Homeostasis
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Inflammation
Pregunta 13
Pregunta
Why is carbon dioxide removed from cells?
Respuesta
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To decrease osmosis
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To allow oxygen to replace it
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To prevent an increase in blood pH
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To prevent cells from becoming acidic
Pregunta 14
Pregunta
Hormone replacement therapy was used to treat a patient who had low salt levels in their blood. Which hormone was used for the treatment?
Respuesta
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Aldosterone
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Anti-diuretic hormone
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Insulin
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Oestrogen
Pregunta 15
Pregunta
Which is the correct sequence of a feedback mechanism for the control of blood pressure?
Respuesta
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blood pressure → blood vessels → brain → reptors → blood pressure
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blood pressure → blood vessels → reptors → brain → blood pressure
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blood pressure → receptors → blood vessels → brain → blood pressure
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blood pressure → receptors → brain → blood vessels → blood pressure
Pregunta 16
Pregunta
The theory of evolution has been supported by studying the structures of vertebrate forelimbs from the fossil record. This type of study is best described as:
Respuesta
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biogeography
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comparative biochemistry
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comparative embryology
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palaeontology
Pregunta 17
Pregunta
The photo shows insect mounds (nests) in hot northern Australia. The mounds are built with a narrow side facing the midday sun and the wide sides facing towards the morning and late afternoon sun. The structure of these nests helps the insects in them to
Respuesta
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become endothermic
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cool down quickly in the afternoon
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maintain a constant body temperature
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develop enzymes that operate at a high temperature
Pregunta 18
Pregunta
A family tree is shown. What is represented by this family tree?
Respuesta
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Sex-linked inheritance
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Co-dominant inheritance
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Inheritance of a recessive trait
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Inheritance of a dominant trait
Pregunta 19
Pregunta
An enzyme was extracted from a mammal. The graph shows the rate at which bubbles are produced in a reaction at 36ºC using the extracted enzyme. Which of the following graphs would show the results if the enzyme reaction were carried out at 18°C?
Respuesta
Pregunta 20
Pregunta
Which of the following statements about DNA provides support for Darwin’s theory of evolution?
Respuesta
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Genes are inherited from both parents
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Mutation of DNA may lead to new alleles
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DNA contains the code for proteins and polypeptides
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The sequence of bases in DNA differs between species
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