Directions
In this section each item consists of six sentences of a passage. The first and sixth sentences are given in the beginning as S1 and S6. The middle four sentences in each have been jumbled up and labelled as P, Q, R and S. You are required to find the proper sequence of the four sentences and mark your response accordingly on the answer sheet.
S1: Mutations are random changes to the base sequence of genes.
S6: Several mutations must occur in the same cell for it to become a tumour cell.
P: This is why mutations in them can result in uncontrolled cell division and therefore tumour formation.
Q: The few genes that can become cancer-causing after mutating are known as oncogenes.
R: Most genes do not cause cancer if they mutate.
S: In a normal cell oncogenes are involved in the control of cell cycle and cell division.
- AOption (a)
RQSP
- BOption (b)
QRSP
- COption (c)
QSRP
- DOption (d)
RPQS
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Correct answer
RQSP
Why this answer is correct
The correct answer is "RQSP".
Key Points
- Sentence R follows the opening statement.
- Sentence Q balances out the previous statement and gives definition of Oncogenes.
- Sentence S explains the regular function of oncogenes which adds to the understanding of what happens when they mutate.
- Sentence P explicates the consequences of oncogenes mutations: uncontrolled cell division leading to tumour formation.
Therefore, the correct answer is "Option 1".
Correct Paragraph: Mutations are random changes to the base sequence of genes. Most genes do not cause cancer if they mutate. The few genes that can become cancer-causing after mutating are known as oncogenes. In a normal cell, oncogenes are involved in the control of cell cycle and cell division. This is why mutations in them can result in uncontrolled cell division and therefore tumour formation. Several mutations must occur in the same cell for it to become a tumour cell.