Bacteria

What are some beneficial roles of bacteria in the human body?

• Causing diseases like cholera and tuberculosis.

• Producing vitamins, preventing tumor formation, and fighting pathogens.

• Attaching to surfaces like teeth and rocks.

• Exchanging DNA with other bacteria.

How old are bacteria, and where can they be found?

• Millions of years old, only in specific environments.

• Billions of years old, practically everywhere on Earth.

• Thousands of years old, only inside living organisms.

• Hundreds of years old, only in water.

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What is a defining characteristic of bacteria as prokaryotes?

• They have a membrane-bound nucleus.

• Their DNA is located in a nucleoid within the cytoplasm.

• They are multicellular organisms.

• They are larger than plant and animal cells.

What kind of information does plasmid DNA carry in bacteria?

• Most of the genetic information for the bacterium.

• Information for protein synthesis.

• Extra information like resistance to antibiotics and toxin production.

• Information for movement using flagellum.