Your Virtual Mentor| Question | Options |
|---|---|
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| During translocation in plants, which substance is moved and in which direction? | substance water from soil root to hairs , substance water from roots to |
| Which substances are transported in the phloem and which in the xylem? | phloem water xylem starch , phloem sugar xylem water, phloem starch xyl |
| Blood enters the left atrium (left auricle) of the heart through | the aorta., the bicuspid valve., the posterior vena cava., the pulmonary vein. |
| 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 |
| 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 |
| 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 |
| Which disease can be caused by excessive consumption of alcohol? | bronchitis, cirrhosis, emphysema, lung cancer |
| 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 |
| Two species of bacteria work together and make yoghurt. What do they produce? | ethanol ? lactic acid ? protease ?, ethanol x lactic acid ? |
| 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 |
| What are the roles of the mosquito and the malarial parasite in the spread of malaria? | mosquito vector malarial parasite pathogen , mosquito pathogen malarial |
| 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 |
| 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 |
| 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 |
| Which statement about the genotypes of organisms is correct? | Dominant alleles are only found in homozygotes., One recessive allele always causes a recessive phe |