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BIOLOGY TEST
Senior 5
TEAM B
Name…………………………………………………………………..
1)
Mark …………..
Which is the correct statement concerning cell and nuclear division?
A Haploid eukaryotes can reproduce by mitosis whereas diploid eukaryotes can reproduce by
mitosis or meiosis.
B Just before prophase, the mass of DNA is double the normal mass. Following anaphase, this
mass is reduced by half and following cytokinesis this mass halves again.
C Mutagens can cause mutations whereas carcinogens can cause cancer. This means that all
mutagens are carcinogenic.
D Some of the roles of mitosis are growth, asexual reproduction, cell repair following tissue
2)
The photomicrograph shows cells in different stages of mitosis.
5
2
4
In which order do these stages occur?
A 3→ 5→ 2→ 1→ 4
B 3→ 5→ 1→ 2→ 4
C 4→ 3→ 5→ 1→ 2
D 4→ 5→ 1→ 2→ 3
1
3)
The statements are about genes and proteins involved in breast cancer.
• The protein coded by the BRAC1 gene inhibits the growth of breast cancer cells.
• The protein coded by the RAD51 gene is required for the repair of damaged DNA.
Which combination of genes is most likely to result in breast cancer?
A
Gene BRAC 1
Normal active gene
Gene RAD 51
Normal active gene
B
Mutated gene
Normal active gene
C
Normal active gene
Mutated gene
D
Mutated gene
Mutated gene
4)
What explains why organisms use mitosis to produce new cells for growth and
repair?
A Daughter cells are genetically identical to the parent cell.
B Daughter cells are not able to divide again.
C Daughter cells have the same genes switched on as the parent cell.
D Daughter cells look identical to the parent cell.
5)
Which event in the mitotic cell cycle ensures that daughter cells are genetically
identical?
A
A spindle is formed.
B
DNA replicates to form sister chromatids.
C
D
The centriole replicates.
The nuclear envelope disappears.
6) Some events that occur in the mitotic cell cycle are listed.
1 Centrioles begin to move towards opposite poles of the cell.
2 Centrioles produce a spindle.
3 Chromatids are pulled to opposite poles of the cell.
4 Chromosomes line up on the equator of the cell.
5 Chromosomes become longer and thinner.
6 Nuclear envelope and nucleoli disappear.
Which row correctly matches one of these events with each stage of mitosis?
7) Which is always true of cytokinesis?
1 Cell organelles replicate.
2
Cell organelles are divided between two cells.
3 Nuclear envelope reforms.
A
1, 2 and 3
B
1 and 3 only
C
2 only
D
3 only