The gene PD-1 plays an important role in immune response to tumor cells. How would using gene editing to knock out this gene help T cells recognize and kill cancer cells?
A) PD-1 will be expressed in the cytosol of the cancer cell. This protects PD-1 from the T cell.
B) PD-1 will be expressed in the cytosol of the T cell. This protects PD-1 from cancer cells.
C) PD-1 will not be expressed on the cancer cell surface. This prevents T cell recognition.
D) PD-1 will not be expressed on the T cell surface. This circumvents one line of the cancer cells defense.
Answer: D
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Indicate whether the statement is true or false.
Which disease is caused by an exotoxin released by the gram-positive, endospore-forming bacteria, often because food
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There is a mutation in the operator of the trp operon in a cell such that the trp repressor is unable to bind to the operator. If tryptophan is added to the cell, what will happen?
A) Tryptophan will bind to the repressor, and trp enzymes will be produced. B) Tryptophan will bind to the repressor, and trp enzymes will not be produced. C) Tryptophan will not bind to the repressor, and trp enzymes will be produced. D) Tryptophan will bind to the operator, and trp enzymes will be produced.