Old & Odd: Archaea, Bacteria & Protists - CrashCourse Biology

The video explores the fascinating world of unicellular organisms, focusing on archaea, bacteria, and protists. It explains the differences between prokaryotic and eukaryotic cells, highlighting the ancient origins and adaptability of archaea and bacteria. The video also delves into the diverse and often complex nature of protists, showcasing their unique characteristics and ecological roles.

What percentage of living organisms on Earth are single-celled?

• More than 90%

• Exactly 75%

• Less than 10%

• About 50%

Which of the following environments is NOT typically inhabited by archaea?

• Acidic mine drainage

• Volcanic hot springs

• Deep ocean vents

• Deserts

What is a key difference between archaea and bacteria?

• Archaea have a nucleus

• Bacteria are eukaryotic

• Archaea reproduce sexually

• They have different ribosomal RNA sequences

Which bacteria group is known for its ability to photosynthesize?

• Chlamydias

• Cyanobacteria

• Proteobacteria

• Spirochetes

What is a unique feature of Gram-positive bacteria?

• Ability to photosynthesize

• Living only in animal cells

• Resistance to all antibiotics

• Thick cell membranes

Which protist is responsible for causing malaria?

• Trypanosoma brucei

• Plasmodium vivax

• Diatoms

• Amoeba

What is the primary characteristic of protozoa?

• They are autotrophs

• They are photosynthetic

• They are heterotrophs

• They are multicellular

Which type of algae is known for living at greater depths due to an extra pigment?

• Blue algae

• Brown algae

• Red algae

• Green algae

What is a common feature of fungus-like protists?

• They produce fruiting bodies

• They photosynthesize

• They are parasitic

• They have flagella

What is the significance of slime molds in the protist kingdom?

• They are the oldest protists

• They are strictly aquatic

• They can move and eat bacteria

• They are the largest protists