Master GCSE Biology

MS1.

- Aseptic technique involves using methods to prevent contamination (1)

- Important to avoid introducing unwanted microorganisms into experiments (1)

MS2.

- Using a microscope involves preparing the specimen, aligning it under the objective lens, and using correct focus (1)

- Calibrating the eyepiece graticule to measure cell size accurately (1)

MS3.

- Independent variable: factor being changed (e.g., salt concentration) (1)

- Dependent variable: factor being measured (e.g., mass change of potato) (1)

- Control variables: factors kept constant throughout the experiment (e.g., temperature, potato size) (1)

MS4.

- To detect the presence of reducing sugars (1)

MS5.

- Place a drop of water on a slide (1)

- Put the specimen in the drop of water (1)

- Carefully place a coverslip over the specimen, avoiding air bubbles (1)

MS6.

- Reliability: ability to get the same results when the experiment is repeated (1)

- Validity: whether the experiment actually measures what it claims (1)

- Accuracy: closeness of the results to the true value (1)

MS7.

- Biuret reagent (1)

MS8.

- Anomalies can indicate errors or variations in the data (1)

- Interpreting anomalies can help identify potential problems with the experiment or provide insights into the biological process being studied (1)

MS9.

- Prepare a sample of the biological sample (1)

- Add iodine solution (1)

- A blue-black color indicates the presence of starch (1)

MS10.

- Precision refers to the closeness of repeated measurements to each other (1)