Which of the following immune system molecules creates holes in the cell membranes of their target cells in order to destroy the cell?
Perforins
Interferons
Cytokines
Lymphotoxins
The Correct Answer is A
Perforins are immune system molecules that create holes in the cell membranes of their target cells in order to destroy the cell. Perforins are proteins that are released by cytotoxic T cells and natural killer cells.
They form pores in the target cell membrane, allowing water and ions to enter the cell and causing it to swell and burst.
The other options are not correct because they do not accurately describe the immune system molecules that create holes in the cell membranes of their target cells. Interferons, cytokines, and lymphotoxins do not create holes in cell membranes.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
The statement that best supports the grant proposal is a. Repeating the published work will provide independent confirmation of the results. Independent confirmation of results is an important part of the scientific process. By repeating an experiment that was recently published by another researcher, the researcher writing the grant proposal can provide additional evidence to support or refute the original findings.
B. Repeating published work with changed variables will extend the previous results, but this is not the main goal of repeating an experiment.
C. Funding this important research will benefit science in the long term is a general statement that does not specifically support the grant proposal to repeat an experiment.
D. Funding this grant proposal will allow this laboratory to continue to study this topic is also a general statement that does not specifically support the grant proposal to repeat an experiment.
Correct Answer is C
Explanation
The statement "Experiments cannot validate hypotheses, only falsify them" can be restated as "A hypothesis that has not been falsified remains provisional." This means that a hypothesis is considered valid until it is disproved by experimental evidence. However, even if a hypothesis has not been falsified, it is still considered provisional and subject to further testing and scrutiny.
A. "Until disproved, an explanation for an observation is valid" is similar to the correct answer but does not capture the provisional nature of a hypothesis.
B. "Certain concepts cannot be subjected to direct experimentation" is not a restatement of the original statement.
D. "Proving a hypothesis exempts it from further testing" is incorrect because no hypothesis can be definitively proven and all hypotheses are subject to further testing and scrutiny.
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