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Which processes can take place in a root hair cell when oxygen is not available? |
active transport only, diffusion only, active transport and osmosis only, diffusion and osmosis on
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Protease breaks down proteins into amino acids. In the ‘lock and key’ hypothesis, what is the lock and what is the key? |
lock amino acid key protease , lock protease key amino acid, lock protease ke
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The diagram shows some chemical reactions that occur in plants. carbon dioxide and water ? sugars ? amino acids ? proteins Which stage or stages depend on the use of nitrate ions as a raw material? |
1 only, 2 only, 1 and 3 only, 2 and 3 only
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Which row in the table correctly identifies the deficiency diseases caused by lack of vitamin C, calcium and iron? |
lack of vitamin C scurvy lack of calcium brittle bones lack of iron anaemia , lack of
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Four foods were analysed for protein, fat and carbohydrate. Which food contains the most energy in a 100 g portion? |
protein % 20 fat % 7 carbohydrate % 1 , protein % 10 fat % 9 ca
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During translocation in plants, which substance is moved and in which direction? |
substance water from soil root to hairs , substance water from roots to
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Which substances are transported in the phloem and which in the xylem? |
phloem water xylem starch , phloem sugar xylem water, phloem starch xyl
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Blood enters the left atrium (left auricle) of the heart through |
the aorta., the bicuspid valve., the posterior vena cava., the pulmonary vein.
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When breathing out, which changes occur in the volume of the thorax, the rib cage and the diaphragm? |
volume of thorax decreases rib cage lowered diaphragm rises, volume of thorax
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When a person moves from a cold room into a hot room, the following responses occur. 1 The brain co-ordinates the response. 2 The skin begins to secrete sweat. 3 Sweat evaporates from the skin surface. 4 Temperature receptors are stimulated in the skin. What is the correct sequence of events? |
3 ? 4 ? 1 ? 2, 2 ? 3 ? 4 ? 1, 4 ? 1 ? 2 ? 3, 1 ? 4 ? 2 ? 3
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A person is sitting in a dark room. What happens in the eye when a light is switched on? |
circular muscle of iris contracts size of pupil decreases , circular muscle of ir
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Which disease can be caused by excessive consumption of alcohol? |
bronchitis, cirrhosis, emphysema, lung cancer
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A patient with a sore throat went to the doctor. The doctor examined the patient and then prescribed an antibiotic as treatment. What was the cause of the sore throat? |
bacteria, tobacco smoke, viruses, yeasts
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Two species of bacteria work together and make yoghurt. What do they produce? |
ethanol ? lactic acid ? protease ?, ethanol x lactic acid ?
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Which situation does not involve the cycling of the factor named? |
carbon dioxide between plants, animals and the atmosphere, energy along a food web of producers and
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What are the roles of the mosquito and the malarial parasite in the spread of malaria? |
mosquito vector malarial parasite pathogen , mosquito pathogen malarial
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Male and female sea urchins release their sperm and eggs into the water where fertilisation takes place. How can their reproduction be described? |
asexual reproduction which results in genetically dissimilar offspring, asexual reproduction which
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A plant P is pollinated. A seed from this plant develops into plant Q. The cells of plant Q contain 14 chromosomes. How many of these chromosomes are identical to chromosomes from plant P? |
if P was self pollinated 7 if P was cross pollinated 7, if P was self pollinated 7 i
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A pregnant woman is told by a genetic counsellor that her baby has equal chances of being blood group A or blood group AB. What are possible genotypes of the woman and her husband? |
AA and BO, AB and BO, AO and BB, AB and AO
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Which statement about the genotypes of organisms is correct? |
Dominant alleles are only found in homozygotes., One recessive allele always causes a recessive phe
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