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26 Apr 2019

Comment on how life moved from unicellular organisms to the variety of multicellular organisms,

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Nelly StrackeLv2

26 Apr 2019

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1.) Explain how the Chlamydomonas, Pandorina and Volvox alga demonstrate the differences between unicellular organisms, colonial organisms and true multicellular organisms. (What are the key differences)

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Explain the meaning of "Gene Expression". Explain why regulation of gene expression is important in (1) unicellular (single-cell) organisms and (2) multicellular organisms.

1. You observe that small crustaceans swimming through a sample of ocean water set off light production, but your first guess is that this is due to some bacterium, since bacteria are so metabolically diverse. True or false

2. How did multicellular organisms evolve from unicellular organisms?

Single-celled organisms joined together, or failed to separate after cell division.

Single-celled organisms joined together only.

Single-celled organisms failed to separate after cell division only.

Single-celled organisms joined together, or absorbed other species by endosymbiosis.

One species absorbed another species by endosymbiosis only.

3.Cooperation between or among cells could have been a key step in the evolution of multicellularity.

True

False

4. Autotrophs must acquire carbon from organic molecules produced from other organisms.

True

False

5. The protists, though now known to have multiple origins, were first group due to their being aquatic, and, most of them, quite small.

True

False

6. You are analyzing samples under a microscope, and one sample coming from what you suspect is a fungus. You find tiny filaments, which, in your report, you call

hyphae.

spores.

fruiting bodies.

7. Fungi are classified into phyla based on which characteristic?

organelles

composition of cell wall

photosynthesis

reproductive structures

multicellular vs. unicellular

gills.

chitin.

You are studying two populations of dung beetles, one of which rolls their dung balls at noon, resting at night, and the other of which reverses this. These could speciate due to

behavioral isolation.

gametic isolation.

mechanical isolation.

temporal isolation.

sexual selection.

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