[PDF] Top 20 NEW SPEC UNIT 1 (TOPIC 1)

... If someone has had a heart attack or stroke, or is identified as being at high risk of one, in addition to the lifestyle changes and drug treatments, those with severe coronary heart disease (CHD) (who have had a heart ... See full document

... In Crick’s expressed view, the problem was susceptible to X-ray diffraction methods ‘if anyone knew how to use them, which Rosalind did. But it’s slower than model building, and she wouldn’t build models … It was all ... See full document

... 1 The method using a 2B pencil works very well. A good, dark print is produced if you touch the pencil-shaded area a couple of times before using the sticky tape. Take care to lift directly off the pencil shading ... See full document

... Now think about what happens when both the PG gene and the introduced artificial gene make messenger RNA. (You might like to work out the first 15 bases of these two mRNAs.) What do you notice about these two mRNA ... See full document

... Now carefully pick through your sample. Do not neglect the very small organisms that may be on dead leaves, or stuck to rocks. Try to identify your animals using a key (see Figure 4 for one simple example). If you cannot ... See full document

... 100 young male soccer players aged 10 to 12 years were recruited to the study. Half of the boys played in their soccer club’s best team; these boys formed the elite group. The other half played for the lowest ranked ... See full document

... Students compare base sequences for four organisms and work out their evolutionary relationship. The students may draw the tree themselves or may use the template provided. It is worth noting that researchers have ... See full document

... 6. What is the difference between a scalar and a vector quantity? Give an example of each. What is the difference between velocity and speed? Give an example of each... Draw a particle [r] ... See full document

... In Unit 1, your child will play the following games. Addition Top-It See Student Reference Book, page 263. This game provides practice with addition facts. Polygon Pair-Up See Student Reference Book, page ... See full document

... Some methods of collecting data are assessment (test), questionnaire, use focus groups, survey, interviews, observational data and using.. secondary or existing data...[r] ... See full document

... 1 DNA is a very important molecule in living organisms as it carries the genetic code that controls all characteristics. When a cell divides, the DNA molecule replicates so that each resulting daughter cell is ... See full document

... (iv) Use your knowledge of the structure and properties of cell membranes to explain the results of this investigation. (3).[r] ... See full document

... Using the information in the table, describe the effect that temperature has on the permeability of the membranes of the beetroot cells.. (2)..[r] ... See full document

... The bacteria from the end of stage 1 were grown for another generation in culture medium containing light nitrogen Heavy strand Light strand Stage 3.. The bacteria from the end of[r] ... See full document

... (b) (i) Suggest how the location of the atheroma results in the position and size of this region of dead heart muscle.. (3)..[r] ... See full document

... (b) (i) Using the information in the table above, describe the relationship between ethnic group, cholesterol levels and the percentage of the population with high blood pressure. (2)[r] ... See full document

... Using the information in the graph, compare the levels of tolerance to pain in the rats given gene therapy with the control group. (3).[r] ... See full document

... Seed Germination Percentage for the duration of the experiment. Set up your experiment based on your refined experimental design.. Things to consider as you set up:[r] ... See full document

... (i) Using the information in the graph, describe how the energy (ATP) available to the heart muscle cells changes with time after the loss of blood flow.. (2)..[r] ... See full document

... (b) The graph below shows the effect of changing the enzyme concentration on the initial rate of a reaction.. (i) Explain the effect of changing enzyme concentration on the initial ra[r] ... See full document