CAPE Biology Unit 1 · 2014 · Paper 1 · Question Q44

Items 44–45 refer to the following diagram of a small section of the human placenta as seen in an electron micrograph. Which of the following options is correct for two visible differences between the maternal red blood cell and the foetal red blood cell? \begin{tabular}{|l|l|l|} \hline & \multicolumn{1}{c|}{\textbf{Maternal Red Blood Cell}} & \multicolumn{1}{c|}{\textbf{Foetal Red Blood Cell}} \\ \hline (A) & Larger, enclosed by capillary & Smaller, not enclosed by capillary \\ \hline (B) & Smaller, not enclosed by capillary & Larger, enclosed by capillary \\ \hline (C) & Smaller, nucleus seen & Larger, no nucleus seen \\ \hline (D) & Larger, no nucleus seen & Smaller, nucleus seen \\ \hline \end{tabular}

1. (A)Maternal: Larger, enclosed by capillary; Foetal: Smaller, not enclosed by capillary
2. (B)Maternal: Smaller, not enclosed by capillary; Foetal: Larger, enclosed by capillary
3. (C)Maternal: Smaller, nucleus seen; Foetal: Larger, no nucleus seen
4. (D)Maternal: Larger, no nucleus seen; Foetal: Smaller, nucleus seen

This question uses a figure or table from the paper — you'll see it when you practise.