Biology B (8BI0) 考試技巧

計算機程式

常見錯誤

1. 1high涉及分數: 2Eukaryotic and prokaryotic cell structure and function

   Dividing drawing size by actual size in magnification calculations without converting the drawing size units (mm or cm) to micrometers (um).

   如何避免: Always measure the drawing in mm, multiply by 1,000 to convert to micrometers (um), and then divide by the actual size (e.g., actual mitochondrion length of 0.9 um).
2. 2medium涉及分數: 1Cell transport mechanisms

   Omitting the negative sign '-' when writing values for osmotic potential (pi) or water potential (psi).

   如何避免: Remember that osmotic and water potentials are always negative or zero. Double-check your final answer to ensure the negative sign is explicitly written.
3. 3high涉及分數: 2Eukaryotic cell cycle and division

   Using chromosome and chromatid terminology interchangeably when explaining stages of the cell cycle or meiosis.

   如何避免: A double-stranded chromosome consists of two identical sister chromatids joined at the centromere. Refer to chromatids separating during anaphase, and chromosomes lining up during metaphase.
4. 4high涉及分數: 2Transport in plants

   Failing to state the biological reason for safety/procedural steps in plant water-loss experiments (such as cutting a stem under water in potometer setups).

   如何避免: Explicitly state that cutting the stem under water prevents air bubbles from entering the xylem, which would otherwise disrupt the continuous cohesive water column and halt transpiration.
5. 5medium涉及分數: 2Enzymes

   Failing to draw a mathematically accurate tangent line when calculating rates from curved graphs.

   如何避免: Use a clear plastic ruler to draw a straight line that touches the outside of the curve at exactly the specified timestamp (e.g., 2 hours). Calculate the gradient of this tangent (change in y divided by change in x).
6. 6high涉及分數: 4Proteins

   Giving only differences and omitting similarities in 'compare and contrast' structural or biochemical questions.

   如何避免: Ensure you write down at least one clear similarity alongside differences. Use structures of the molecules (like C, H, O contents or shared bond types) to secure these marks easily.
7. 7medium涉及分數: 3Cell transport mechanisms

   Dividing by n instead of n-1 when calculating sample standard deviation manually in practical analysis questions.

   如何避免: Strictly follow the provided formula: s = sqrt( sum( (x - mean)^2 ) / (n - 1) ), where n is the number of repeats (not the total data points in all treatments).
8. 8medium涉及分數: 2Eukaryotic and prokaryotic cell structure and function

   Drawing a cellular organelle (like a mitochondrion) with broken, sketchy lines, overlapping borders, or artistic shading.

   如何避免: Use a sharp HB pencil to draw clean, continuous single-line boundaries. Show double membranes clearly without any artistic shading or overlapping pencil strokes.
9. 9medium涉及分數: 2Transport in plants

   Assuming all water taken up by a plant shoot in a potometer is transpired, ignoring other physiological uses.

   如何避免: State that water uptake is not exactly equal to water loss because some water is retained inside cells to maintain turgor pressure, or is used as a reactant in photosynthesis.
10. 10high涉及分數: 6Blood cell functions and cardiac cycle

    Failing to link data observations to biological rationale in 6-mark level-of-response questions.

    如何避免: Structure your answer by pairing every observed data trend with its physiological or biochemical explanation (e.g., link low lymphocyte counts directly to decreased antibody synthesis and a weakened immune system).
11. 11medium涉及分數: 2Carbohydrates

    Believing that Benedict's color chart provides an exact, quantitative measurement of glucose concentration.

    如何避免: Describe this method as semiquantitative, noting that judging colors visually is subjective and that the chart colors represent broad concentration ranges rather than precise concentrations.