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WorksheetsB2 Cell division
Total questions: 65
Worksheet time: 3hrs 32mins
How many chromosomes do human somatic cells (body cells) have?
23
48
46
92
When you start with 1 cell, at the end of mitosis, how many identical cells will you have?
1
2
3
4
After mitosis is complete, the new cells:
are all identical
are half identical and half different
are all different
are all stretched out
Why would it be important to replicate DNA before a cell divides in mitosis or meiosis?
In order for genetic information to be transferred into daughter cells.
In order for the cell to be able to increase in size.
In order for the DNA to be contained in the nucleus.
In order for the cell to re-order the DNA sequencing in the new cells.
Before cells can divide, what must be copied?
mitochondria
cytoplasm
DNA
Cell Wall
Humans have ________ pairs of chromosomes.
21
23
46
None of the above
If a somatic (body) cell in a butterfly contains 24 chromosomes, a butterfly egg would contain
3
6
12
24
Meiosis makes sperm and egg cells. In humans, sperm and egg cells each have _____ chromosomes. Therefore a fertilized human egg cell (sperm and egg cell combined) would create a cell with _____ chromosomes.
23, 46
46, 23
2, 4
50, 100
A male shark has 40 chromosomes in each of its sex cells. How many would be present in its body cells?
20
40
80
160
How many chromosomes are found in a human adult egg cell?
23
46
23 pairs
46 pairs
What type of cells have not begun to differentiate into specialized cells?
gametes
stem cells
somatic cells
neurons
Cells divide when tissues and organs are ...
copied
injured
divided
replaced
Which organelle is DNA or Chromosomes located in a Eukaryotic Cell?
The Mitochondria
The Chloroplast
The Golgi Body
The Nucleus
A chromosome is packaged
DNA
Protein
Carbohydrates
Lipids
In which order do the following stages occur?
DNA replication, mitosis, cell division
Mitosis, cell division, DNA replication
DNA replication, cell division, mitosis
Cell division, DNA replication, mitosis
Which is not a source of embryonic stem cells?
umbilical cord blood
bone marrow
aborted embryos
amniotic fluid
What is meant when you say that a cell has differentiated?
cells have become enlarged
cells have specialised to complete a particular function
cells are unspecialised and can change to have any function
cells have undergone cell division by mitosis
For which medical condition would stem cell treatment be ineffective?
macular degeneration (eyesight deterioration)
preventing HIV
insulin production
spinal cord injuries
What is the biggest disadvantage of using adult stem cells?
it involves therapeutic cloning, which is very difficult
they grow and divide very rapidly with the risk of causing cancer
it may trigger an immune response
some people may disagree for ethical reasons
At which stage of life does mitosis occur at a slower rate than cell death?
developing embryo
childhood
old age
adulthood
Where would you find the greatest concentration of
undifferentiated cells in a plant?
in the phloem
in the palisade layer in the leaf
in the root tips
in the xylem
In which part of the body would the rate of mitosis
be happening the fastest?
the brain
the skin
the spinal cord
the eye
What would be an advantage of using genetically identical
clones of plants created from stem cells in research?
the experiment would not need repeating
it removes unwanted variables
it removes human error from the experiment
the results would be exactly the same each time
Which is a disadvantage of therapeutic cloning?
there are concerns about the risk of cancer from rapid cell division
there is the risk of transfer of genetic diseases
the use of immunosuppressant drugs is required
cells would have different genes to the recipient
Human body cells have ________ pairs of chromosomes.
21
23
46
None of the above
A human cell has 46 chromosomes before mitotic division. How many chromosomes will the daughter cells after mitosis?
12
23
46
92
How are plant stem cells different to human stem cells?
Human stem cells can become any kind of human cell, plant stem cells can only become root cells or leaf cells.
Human stem cells can only become neurones or kidney cells, whereas plant stem cells can become any kind of cell.
Once plant cells have differentiated into specialised cells, they can re-differentiate into another type of specialised cell if needed.
Once human cells have differentiated, they mutate to give you special powers, like x-ray vision!
Chromosomes are arranged in .....
23 pairs
22 pairs
46 pairs
44 pairs
In plants, stem cells are formed all the time in the .....
meristems
chloroplasts
mitochondria
nucleus
The production of identical offspring from a plant stem cell is called ...............
cloning
mitosis
meiosis
clowning
Embryonic stem cells have been removed and .........
grown into differentiated cells
grown into plant cells
grown into human beings
grown into zygotes
DNA is found in cells in......
the nucleus
ribosomes
mitochondria
chloroplasts
Stem cells ......
are all identical
are all different
cannot make other types of cell
cannot differentiate
Which is or these statements is true about stem cells?
They can specialise into nerve cells.
They will always stay the same.
They will all become nerve cells.
They can never become nerve cells.
Which is or these statements is true about nerve cells?
They can change into muscle cells.
They can only reproduce to make more nerve cells.
They can change back into stem cells.
They can never die.
Meristems are found in the active parts of a plant's .....
stem & root
leaf & root
stem & leaf
flower & leaf
Stem cells can be taken from ......
embryos
egg cells
sperm cells
nerve cells
Which cells can be found in the fluid around a baby?
embryonic stem cells
adult stem cells
zygotes
nerve cells
An embryo forms from a .......
zygote
meristem
chromosome
body cell
What are stem cells used in?
repair diseased tissues
repair damaged cells
Research
Therapeutically
Why is the use of embryonic stem cells controversial?
The embryos are destroyed in the process of extracting the stem cells.
People consider their use as destroying a life.
They are taken from little kids, which is painful.
They are put into a different person.
