Biology 5090 · O Level
Nuclear division
32 practice questions on Nuclear division, with worked solutions and instant marking.
Which term describes the chromosome number in these human cells?
May/June 2015
A person with Down’s syndrome is born with 47 chromosomes in each cell, rather than 46. What might have caused this?
May/June 2015
The diagram illustrates some cells in the life cycle of an animal. Which processes are taking place at X, Y and Z?
May/June 2015
An individual with Down’s syndrome has 47 chromosomes in each cell at birth, rather than 46. What might have caused this?
May/June 2015
A diploid cell forms additional cells that contain a haploid chromosome number. What kind of cell division is taking place, and what is the function of the cells formed?
May/June 2016
The diagram illustrates several stages of cell division in a fruit fly. Cell X has 8 chromosomes. How many chromosomes are present in cell Y and in cell Z?
May/June 2017
The diagram illustrates several stages of cell division in a fruit fly. Cell X contains 8 chromosomes. How many chromosomes are present in cell Y and in cell Z?
May/June 2017
The diagram illustrates the chromosomes in a cell. Which diagram shows the outcome of one division of the cell by mitosis?
May/June 2018
The diagram illustrates the chromosomes in a cell. Which diagram shows the result of one division of the cell by mitosis?
May/June 2018
The diagram illustrates several stages in the asexual reproduction of a single-celled organism. Which row correctly indicates the relative quantities of DNA in the cells V, W, X, Y and Z?
May/June 2019
The diagram illustrates the human life cycle.
May/June 2021
Which graph shows the way the amount of DNA in a cell changes as the cell undergoes mitosis?
May/June 2022
The diagram presents a cross-section of a seed before germination and shows the same seed again after it has developed into a seedling.
May/June 2022
The diagram illustrates cell X, which has 24 chromosomes. It divides by mitosis to form cells Y and Z. How many chromosomes are present in cell Z?
May/June 2023
The diagram illustrates several stages of cell division in a fruit fly. Cell X has 8 chromosomes. How many chromosomes are present in cell Y and in cell Z?
May/June 2023
Which of the following statements about nuclear division is correct?
May/June 2025
A muscle cell from a horse has 64 chromosomes. How many chromosomes are present in a horse sperm cell?
May/June 2025
The diagram shows a pair of chromosomes from the same cell. What are the lines labelled P indicating?
Oct/Nov 2016
The diagram shows two chromosomes from one cell. What are the lines labelled P pointing at?
Oct/Nov 2016
Which statements concerning meiosis are correct?
Oct/Nov 2017
The diagram shows gametes P and Q joining together to form cell R. Cell R then forms gametes S, T, U and V. Which statement about the chromosome numbers in the cells and gametes is correct?
Oct/Nov 2019
The diagram illustrates the life cycle of a plant species. At what stage does meiosis (reduction division) take place?
Oct/Nov 2019
The statements E to L concern the process of cell division.
Oct/Nov 2019
Several statements about chromosomes are given. 1. A chromosome contains one long DNA molecule. 2. Chromosomes contain genes. 3. During cell division, meiosis keeps the chromosome number unchanged. 4. The usual human chromosome number is 46. Which of these statements is correct?
Oct/Nov 2021
The diagram shows the mass of DNA in cells that are dividing. Which row identifies this type of cell division?
Oct/Nov 2021
As a nucleus divides by meiosis, alterations may occur that lead to a gamete with an unusual number of genes or chromosomes. Which alteration could lead to a gamete that may cause a child to have Down’s syndrome?
Oct/Nov 2021
Explain the part played by the nucleus and cell division in the inheritance of characteristics from parents to offspring.
Oct/Nov 2021
Fig. 4.1 presents a Siamese fighting fish that lives in fresh water.
Oct/Nov 2023
The diagram illustrates several stages in the asexual reproduction of a unicellular organism. Which row gives the relative quantities of DNA in cells V, W, X, Y and Z?
Oct/Nov 2024
Asexual reproduction is a process involving the cell cycle, during which the cell divides and is then followed by growth and DNA synthesis before it is ready to divide again. The diagram illustrates the stages in one full cell cycle. It takes $1.75$ hours for this cell cycle to be completed. Using the diagram, which activity in the cycle lasts $52.5$ minutes altogether?
Oct/Nov 2024
Which of the following statements about meiosis are correct?
Oct/Nov 2024
Bacteria multiply by dividing into two cells. Under ideal conditions, with enough water and food and at a warm temperature, this can occur every 20 minutes. Usually, very small numbers of bacteria do not cause illness. A student removes her lunch from the fridge when it has 4 bacteria. Two hours later, while it is at room temperature, it has 256 bacteria. From the moment the food is taken out of the fridge, how long will it be before her food contains 16 384 bacteria?
Oct/Nov 2025