Nurses must be trust and accept patients' reports of pain.

The company should consider how much profit can gain by introducing this new product.

Only 24% of respondents were correctly answered this question.

As the policy comes from rational analysis and base on experience, it is grounded in fact.

Nurses' experience in caring for cancer patients in pain may be influenced their attitudes toward pain management.

Correct sentence:
Nurses' experience in caring for cancer patients in pain may be influenced influence their attitudes toward pain management.
OR
Nurses' experience in caring for cancer patients in pain may be influenced be influenced by their attitudes toward pain management .
These two 'corrections' have quite different meanings. Can you recognise in which one the attitude is the cause, and in which the effect?
NOTE: In the first 'correction' the experience the nurses have may cause a change in their attitudes – the attitudes will be an 'effect' resulting from their experience – while in the second 'correction' the way the nurses experience their caring duties may be changed by the attitudes they began with – the attitudes will be a 'cause' of the type of experience they have.

This breaks the cell wall, so the proteins release to the lysis buffer.

The amplified light wave divide into two parts by the coupler.

Surprisingly, only 12.4% of the nurses had been attended a course in pain management.

The collected data have coded and checked by comparison with the results of other researchers.

This digital system is used electronic methods to identify customers.

Correct sentence:
This digital system is used uses electronic methods to identify customers
Incorrect form of the main verb. The active voice is used here, with a direct object.