Answers to end of chapter ‘revise’ questions
Test your knowledge of what you have learned in the book by completing the end of chapter ‘revise’ questions in the book and checking your answers.
1. Identify the different organelles in the human body and state their functions.
2. Outline the stages of mitosis and meiosis.
Interphase: between mitotic cell division, cells carry out functions. Late stage – chromosomes duplicate into two chromatids.
Prophase: chromosomes split into two chromatids, centrioles separate to each end of the cell with the mitotic spindle between, the nuclear membrane disappears.
Metaphase: chromatids line up along the equator of the spindle attached by centromeres.
Anaphase: the spindle contracts and draws chromatids apart to ends of the cell.
Telophase: chromosomes reform, the nuclear membrane reforms, two identical daughter cells are formed.
3. Identify the five types of human cells, outline the different variants within each group and clarify their function.
- Blood and lymph: transport substances around the body.
erythrocytes that carry oxygen
leucocytes that combat infection
thrombocytes that cause blood clotting