What significant evolutionary event occurred over 600 million years ago?
Getting to Know Our Single-Celled Ancestors

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Biology
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7 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The extinction of dinosaurs
The appearance of mammals
The emergence of metazoans
The formation of the ozone layer
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary function of the flagella in choanoflagellates?
To create water currents for feeding
To help them reproduce
To enable photosynthesis
To protect them from predators
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How did Henry James Clark contribute to our understanding of choanoflagellates?
He compared them to sponge cells
He proved they were unrelated to animals
He discovered their ability to photosynthesize
He identified them as a type of bacteria
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What modern technique confirmed the relationship between choanoflagellates and animals?
X-ray crystallography
Magnetic resonance imaging
Molecular phylogeny
Radioactive dating
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What do the genetic similarities between choanoflagellates and sponges suggest?
They are both types of fungi
They share a common ancestor
They are both capable of photosynthesis
They evolved independently
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What role do the proteins found in choanoflagellates play?
They help in locomotion
They act as a glue for cell adhesion
They enable photosynthesis
They provide structural support
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why are choanoflagellates considered important in understanding evolution?
They are the most complex single-celled organisms
They provide insights into the last common ancestor of animals
They are the first multicellular organisms
They are the only organisms with flagella
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