Master GCSE Biology

MS1:

- Aseptic technique is a set of procedures used to prevent contamination of a specimen or culture (1)

MS2:

- Prevents contamination of the culture with unwanted microorganisms (1)

- Ensures the results of the experiment are valid (1)

MS3:

- Make a thin section of the plant tissue using a sharp scalpel (1)

- Place the section on a microscope slide with a drop of water (1)

- Cover the section with a coverslip (1)

- Remove excess water using a tissue (1)

MS4:

- To test for the presence of reducing sugars (1)

MS5:

- Formation of an orange to reddish-brown precipitate (1)

MS6:

- Add a few drops of Biuret reagent to the sample (1)

- Shake the test tube (1)

- Observe the color change (1)

MS7:

- The concentration of the iodine solution (1)

MS8:

- To ensure a fair test and reduce bias (1)

- To eliminate the effects of other variables that could affect the results (1)

MS9:

- Accuracy: How close the measurement is to the true value (1)

- Precision: How consistent the measurements are (1)

- Both accuracy and precision are important for reliable results (1)

MS10:

- Some enzymes may not work as expected (1)

- The temperature may not be controlled accurately (1)