PBS 2020 EOC & Unit 3 Test Review

Front

What is a prion?

Back

A prion is an infectious agent composed of protein that can cause neurodegenerative diseases, such as Creutzfeldt-Jakob disease and scrapie.

Front

What is the function of flagella in bacteria?

Back

Flagella are whip-like structures that enable bacteria to move through their environment.

Front

Who studies the spread of diseases?

Back

An epidemiologist is a scientist who studies the distribution and determinants of health-related states or events in specified populations.

Front

What is the purpose of the 'zig-zag' method in streaking agar plates?

Back

The 'zig-zag' method is used to thin out bacterial growth to create isolated colonies on an agar plate.

Front

What is the outer covering of a bacterial cell called?

Back

The outer covering of a bacterial cell is called the capsule.

Front

Define the term 'capsule' in the context of bacteria.

Back

A capsule is a protective layer that surrounds the cell wall of some bacteria, providing protection against phagocytosis and desiccation.

Front

What are helminthes?

Back

Helminthes are parasitic worms that can infect humans and animals, causing various diseases.

Front

What role do viruses play in infectious diseases?

Back

Viruses are microscopic infectious agents that can replicate only inside the living cells of an organism, often causing diseases.

Front

What is the significance of the cell membrane in bacteria?

Back

The cell membrane controls the movement of substances in and out of the bacterial cell, maintaining homeostasis.

Front

What is the nucleoid in a bacterial cell?

Back

The nucleoid is the region in a bacterial cell where the circular DNA is located, not enclosed by a membrane.