Producing New Cells (SQA National 5 Biology): Exam Questions

During mitosis, which of the following occurs immediately before the cytoplasm divides?

The graph shows the growth of a foetus.

The average monthly increase in the length of the foetus from month 5 to month 9 is

A chemical called colchicine stops cells from producing spindle fibres during mitosis, which prevents further stages occurring.

Which stage of mitosis would still occur when colchicine is present?

A role of stem cells in the human body is to produce

Tissue stem cells can be transplanted to replace blood cells.

Describe the feature of stem cells that allows them to be used in this way.

To successfully treat a blood disorder, between 2 million and 4 million stem cells per kilogram of the patient’s body mass are needed.

Calculate the minimum number of stem cells required to treat a patient with a mass of 78.5 kg.

........................million

The graph shows the survival rates of patients with a blood disorder who have received a stem cell transplant.

(i) Identify the survival rate of patients 24 months after receiving a stem cell transplant.

[1]

............................%

(ii) Describe the relationship between the number of months after receiving a stem cell transplant and the survival rate.

[1]

Other than tissue, name another type of stem cell.

Two stages of mitosis are shown in the diagrams.

(i) Name the structures that pull the pairs of chromatids apart.

[1]

(ii) Describe what happens immediately after stage C.

[1]

Stem cells can divide in order to self-renew.

State the feature of stem cells that gives them the potential to develop into different types of cell.