PLTW PBS 1.1.1-1.1.4

Front

What are antibodies?

Back

Proteins produced by the immune system in response to foreign antigens, such as bacteria or viruses, that help neutralize or destroy them.

Front

What is the purpose of presumptive testing in forensic science?

Back

To determine if a substance may or may not be blood, rather than identifying the specific blood type.

Front

What does skin conductivity measure?

Back

It measures the electrical conductance of the skin, which can indicate levels of sweat and emotional arousal.

Front

In an experiment, what is the dependent variable?

Back

The variable that is measured or tested in an experiment, which is affected by changes in the independent variable.

Front

How can the diameter of a blood drop be used in forensic analysis?

Back

It can be used to estimate the height from which the blood fell, providing insights into the circumstances of a crime.

Front

What is agglutination?

Back

The clumping of cells, such as red blood cells, in response to an antibody, often used in blood typing.

Front

What are clotting factors?

Back

Proteins in the blood that help control bleeding by forming clots.

Front

What is the significance of blood type in transfusions?

Back

Knowing the blood type is crucial to prevent adverse reactions during blood transfusions, as incompatible blood can cause serious health issues.

Front

What is the role of phagocytes in the immune system?

Back

Phagocytes are cells that engulf and digest foreign particles, bacteria, and dead or dying cells.

Front

What is the independent variable in an experiment?

Back

The variable that is changed or controlled in a scientific experiment to test its effects on the dependent variable.