Biology 9700 · AS & A Level
Chromosome behaviour in mitosis
100 practice questions on Chromosome behaviour in mitosis, with worked solutions and instant marking.
The diagram illustrates cells at various phases of the cell cycle. Which stage comes immediately before cytokinesis?
Feb/March 2016
The diagram lists three chromosome parts together with their functions. Parts: P1 centromere P2 histone proteins P3 telomere Functions: F1 compacts DNA into tightly packed structures F2 joins the two chromatids together F3 stops genes from being lost Which combination is correct?
Feb/March 2018
The graphs indicate several distance measurements recorded from metaphase of mitosis onwards. Each graph is drawn to scale relative to the others. Which row correctly matches each graph to its distance measurement?
Feb/March 2018
In animal cells undergoing mitosis, which process takes place after prophase?
Feb/March 2019
Embryonic stem cells can keep dividing without limit. During their repeated mitotic cell cycles, what happens to the telomeres?
Feb/March 2019
DNA molecules in a eukaryotic cell need to be packed tightly because their total length is far greater than the diameter of the nucleus. Which structures are needed in the process of packing DNA molecules tightly?
Feb/March 2021
Which of the following statements about mitosis are correct?
Feb/March 2021
A human chromosome consists of different sections. In a typical human chromosome, certain sections are found in greater numbers than others. Which sections are arranged from the smallest number to the largest number in a human white blood cell?
Feb/March 2021
In a typical human chromosome, some sections occur in larger numbers than others. Which sections are given in order from the greatest number to the smallest number?
Feb/March 2022
Which row gives the correct description of a stage of mitosis?
Feb/March 2022
The diagram illustrates the mitotic cell cycle. In which phase do chromosomes condense and become visible?
Feb/March 2024
The photomicrograph displays plant cells at different points in the mitotic cell cycle. Four cells are marked with numbers so that they can be identified. One of the numbered cells is in the main stage of mitosis where the spindle starts to form. Another numbered cell is in the main stage of mitosis where the spindle fibres shorten. Which row correctly identifies the two cells in these stages of mitosis?
Feb/March 2025
What takes place during anaphase of mitosis?
May/June 2010
The diagram illustrates chromosomes during metaphase in mitosis. What are the diploid and haploid numbers for this species?
May/June 2010
What happens during anaphase of mitosis?
May/June 2010
The diagram illustrates chromosomes during metaphase of mitosis. What are the diploid and haploid numbers for this species?
May/June 2010
What process takes place in prophase of the mitotic cell cycle in an animal cell?
May/June 2011
During which stage of mitosis do these events take place? centromeres divide spiralisation and condensation of DNA
May/June 2011
During prophase of the mitotic cell cycle in an animal cell, which process takes place?
May/June 2011
What happens during metaphase of mitosis?
May/June 2012
The following events all occur during mitosis. 1 centromeres split 2 chromatids travel to opposite poles of the cell 3 chromosomes arrange along the equator of the spindle 4 chromosomes uncoil 5 two chromatids are linked by a centromere What is the correct sequence for these events?
May/June 2012
What happens during metaphase of mitosis?
May/June 2012
Nocodazole is a chemical used in the investigation of mitosis. It makes every mitotic cell arrest at metaphase. Which statements correctly show how this chemical could act?
May/June 2013
Chromosome telomeres are necessary for DNA replication, and they are not entirely copied during mitosis. A substance X is known to replace telomeres completely during mitosis. What effect would be seen when cells are grown with substance X and when they are grown without substance X?
May/June 2013
The diagram shows a cell nucleus in prophase of mitosis. Which statement gives the description of the chromosomes in each daughter nucleus immediately after this cell has divided by mitosis?
May/June 2013
Which aspects of mitosis ensure that the cell’s genetic constitution is preserved?
May/June 2013
The diagram shows a cell nucleus during prophase of mitosis. Which statement describes the chromosomes present in each daughter nucleus immediately after this cell divides by mitosis?
May/June 2013
The diagram illustrates crosses involving wild wheat and two kinds of grass. What chromosome number does the fertile hybrid 2 have?
May/June 2014
The diagram illustrates a human cell $(2n = 46)$ at the close of prophase of mitosis (cell 1) and daughter cells immediately after telophase (cells 2 and 3). How many DNA molecules are present in the nucleus of cell 1 and cell 2?
May/June 2014
The cell cycle contains mitosis. Which characteristics describe nuclear division?
May/June 2014
The photomicrograph displays cells at various stages of mitosis. In what sequence do these stages happen?
May/June 2014
The graphs display a range of measurements recorded from metaphase of mitosis onwards. They are drawn to scale relative to each other. Which row correctly names each graph?
May/June 2015
The diagrams illustrate chromosomes at different stages of mitosis. Which diagram shows the cell cycle in the correct sequence?
May/June 2015
Which processes take place in prophase of the mitotic cell cycle in an animal cell?
May/June 2016
A group of chemicals used to treat cancer stops the spindle from forming during mitosis. Which phase of mitosis is affected first?
May/June 2016
Which process takes place during prophase in the mitotic cell cycle of an animal cell?
May/June 2016
The electron micrograph displays a set of human chromosomes. Which label correctly identifies each structure marked W, X and Y?
May/June 2017
During mitosis, which statement about chromosome behaviour is correct?
May/June 2017
The photomicrograph shows one stage of mitosis. Which statement would be correct for the following stage in mitosis?
May/June 2017
The diagram illustrates part of the arrangement of a DNA molecule and the histones attached to it. Which statement about the features labelled P, Q and R during prophase of mitosis is correct?
May/June 2017
The photomicrograph displays cells undergoing mitosis. Which statement describes what happens next in cell X?
May/June 2017
A student examined cells in the growing region (meristem) of an onion root and collected the data shown. What percentage of cells have chromosomes that look like two chromatids?
May/June 2018
Which of these stages are included in mitosis?
May/June 2018
A nucleus contains a chromosome with a telomere made up of many repeats of the base sequence TTAGGG. The chromosome was taken from four different cells, and the total number of bases in the telomere was measured. Which total number of bases was obtained from the cell that had completed the greatest number of mitotic divisions?
May/June 2018
To allow tissues to be repaired successfully during cell replacement, each daughter cell must contain the same chromosome complement as the mother cell. Which stages of mitosis ensure that each daughter cell gets one chromatid from every chromatid pair?
May/June 2018
Which statement correctly describes how many telomeres are present during prophase in a human body cell?
May/June 2018
Which row shows how a chromosome looks at the start of prophase in mitosis and the number of DNA strands in that chromosome?
May/June 2018
The graph illustrates measurements recorded during one mitotic cell cycle. Which stage of mitosis starts at X, and what measurements are represented by curves 1 and 2?
May/June 2018
To make the telomeres visible, a scientist colours the chromosomes in a diploid plant cell with a fluorescent dye. The cell contains $38$ chromosomes. How many telomeres will the scientist see in one of the nuclei during telophase of mitosis?
May/June 2019
The photomicrograph shows a cell in mitosis. What is taking place in this cell?
May/June 2019
Which of the listed events are involved in mitosis?
May/June 2019
The graph illustrates how the length of the spindle fibres changes during mitosis. Which section of the graph indicates when all the centromeres have separated from the spindle fibres?
May/June 2019
Three chromosome parts and what they do are given. Which part is correctly paired with its function?
May/June 2019
In a typical human chromosome, certain components occur in greater numbers than others. Which list orders the parts from the greatest number to the smallest number?
May/June 2019
The diagram illustrates a cell in mitosis. Which description correctly identifies the cell?
May/June 2019
In prophase, a scientist applies a fluorescent dye to the chromosomes of a diploid animal cell in order to stain the telomeres. This cell contains 32 chromosomes. How many telomeres will the scientist observe?
May/June 2020
The diagram illustrates the cell cycle. In which phase do chromosomes condense and become visible?
May/June 2020
Which account of chromosome structure is correct?
May/June 2020
A drug has been produced to treat some types of cancer. It stops mitosis by attaching to the spindle and stopping sister chromatids from separating and moving to opposite poles of the cell. The photomicrograph displays cells in different phases of mitosis. Which stages of mitosis would still be possible in a cell that is entering prophase and is treated with this drug?
May/June 2020
Which row gives the correct description of the chromosome structures present during mitosis?
May/June 2020
During which stages of mitosis do chromosomes consist of two chromatids joined by a centromere?
May/June 2021
Human chromosomes are made up of different parts. Some parts occur more often than others. Which parts are given in order from the most numerous to the least numerous in a human white blood cell?
May/June 2021
A single skin cell was isolated and placed into growth medium in a sterile Petri dish. The Petri dish was then incubated for 16 days. Over this period, the number of skin cells increased because mitotic divisions happened repeatedly. In the nucleus of each skin cell, one chromosome has a telomere made up of many repeats of the base sequence TTAGGG. On days 4, 8, 12 and 16 of the incubation period, one cell was taken out of the Petri dish each time. For each of these cells, the total number of bases in the telomere of this chromosome was measured. The four cells had different total numbers of telomere bases for this chromosome: 5548, 5580, 5645 and 5700. What was the total number of telomere bases in the chromosome from the cell that had undergone the greatest number of mitotic divisions?
May/June 2021
The photomicrograph displays cells that are in different phases of mitosis. A student made four claims about the photomicrograph. 1 Cell P is in anaphase. 2 Spindle fibres are being formed in cell Q. 3 The amount of DNA in cell R is equal to that in cell T. 4 The correct sequence of the stages is S → R → T → P → Q. Which claims are correct?
May/June 2022
What takes place during prophase in animal cells? 1 nuclear envelope fragments 2 nucleolus vanishes 3 stained chromosomes become visible 4 centrioles duplicate
May/June 2022
Which statements about mitosis are accurate?
May/June 2022
The diagram illustrates the stages of mitosis. Which is the correct order of the mitosis stages shown by the numbers on the diagram?
May/June 2022
A student examined the cells in the growing region (meristem) of an onion root and recorded the results shown. Stage and number of cells: interphase: 886 prophase: 73 metaphase: 16 anaphase: 14 telophase: 11 What percentage of the cells have chromosomes that are visible as two chromatids?
May/June 2023
The diagram presents a portion of the arrangement of a DNA molecule section and the associated histones, P and R, during prophase of mitosis. Which statement about the features labelled P, Q and R in prophase of mitosis is correct?
May/June 2023
In how many of the structures listed below would genetic material usually include telomeres? • bacterial cell • chloroplast • mitochondrion • nucleus
May/June 2023
Eukaryotic organisms enlarge and become bigger because of cell division. The diagram shows several stages of mitosis, with one stage absent, marked X. What happens in stage X?
May/June 2024
The graphs display different distance measurements recorded from the beginning of metaphase of mitosis. The graphs are drawn to scale relative to each other. Which row correctly matches each graph to the distance measurement?
May/June 2024
Which row correctly describes the beginning of anaphase of mitosis?
May/June 2024
The graph displays the mean length of the spindle fibres during mitosis. Which part of the graph indicates when all the centromeres have become detached from the spindle fibres?
May/June 2024
A high-power photomicrograph shows a cell at one stage of mitosis. The chromosomes can be seen arranged along the cell equator, but there is no nuclear envelope. Which stage of mitosis is shown in the photomicrograph?
May/June 2024
A scientist uses a fluorescent dye to stain the chromosomes in a plant cell in order to view the telomeres. This cell contains 38 chromosomes. How many telomeres would the scientist see in one of the nuclei during telophase of mitosis?
May/June 2024
A sample of 500 cells undergoing mitosis was observed so that the mitotic stage of each cell could be identified. The table presents the findings. Which row is correct?
May/June 2025
The diagram illustrates a chromosome. Which structures are P and Q?
May/June 2025
The diagram illustrates the positioning of chromosomes with spindle fibres attached during one stage of mitosis. Which row correctly names the stage of mitosis and states what is occurring?
May/June 2025
Human body cells in interphase contain 46 chromosomes. What is correct about how many telomeres are present in prophase of a human body cell?
May/June 2025
A cell is undergoing mitosis. At this point, each chromosome in the cell is made up of two chromatids. The chromosomes have not arranged themselves along the equator. Which stage of mitosis is being described?
May/June 2025
The diagrams illustrate two phases of the cell cycle in different organisms. The quantity of specific structures in each diagram is counted. Which row gives the correct overall total for the various structures?
May/June 2025
Which aspects of mitosis help preserve the genetic makeup of the cell?
May/June 2025
Which statement describes what happens to the nuclear envelope and the cell membrane during mitosis?
Oct/Nov 2010
The diagram illustrates the chromosomes in a typical plant cell at the metaphase stage. Which row gives the description of this cell during metaphase?
Oct/Nov 2010
What term describes the changes to the nuclear envelope and the cell membrane during mitosis?
Oct/Nov 2010
The graph illustrates how the length of the spindle fibres changes during mitosis. Which part of the graph indicates the point at which the centromeres separate from the spindle fibres?
Oct/Nov 2011
Which statement concerning a diploid cell is not true?
Oct/Nov 2011
Which statement is not correct for mitotic cell division?
Oct/Nov 2012
The diagram illustrates the chromosomes in a single cell that has been flattened during mitosis. Which mitotic stage is depicted, and what is the haploid chromosome number for this species?
Oct/Nov 2012
The diagram shows a cell from an organism produced by reduction division. What is the diploid number of this organism?
Oct/Nov 2012
Which diagram shows a cell in metaphase during mitosis?
Oct/Nov 2012
Colchicine is a substance that prevents the formation of spindle fibres. At which stage does the cell cycle stop?
Oct/Nov 2012
A student observed the cells in the growing region (meristem) of an onion root and recorded the data shown below. What percentage of cells contain chromosomes that appear as two chromatids?
Oct/Nov 2014
The photomicrograph shows a cell in mitosis. What is occurring in this cell?
Oct/Nov 2015
Which of the following statements about a diploid cell are correct?
Oct/Nov 2015
The photomicrograph depicts a cell as it undergoes mitosis. What is taking place in this cell?
Oct/Nov 2015
Which row is correct for a human cell immediately before it enters prophase of mitosis?
Oct/Nov 2016
Which row correctly indicates how the nuclear envelope, the centrioles and the spindle behave during a stage of mitosis?
Oct/Nov 2016
Chromosome telomeres are needed for DNA replication and are not fully renewed in mitosis. Substance X fully replaces telomeres in mitosis. What effect will there be when cells are grown with and without substance X?
Oct/Nov 2016