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bio204.s1.d36
cava bio 204 s1.d36 3.04 Two Types of Cells
| Question | Answer |
|---|---|
| The earliest life-forms on earth were [-karyotic] cells | The earliest life-forms on earth were prokaryotic cells |
| In 1993 J. William Schopf discovered fossilized bacteria in Western Australia. Schopf dated the rocks to 3.5 [...] years old. | In 1993 J. William Schopf discovered fossilized bacteria in Western Australia. Schopf dated the rocks to 3.5 billion years old. |
| Fossil evidence shows that for the first 1.5 billion years, all life on Earth was in the form of single-cell [-karyotes]. | Fossil evidence shows that for the first 1.5 billion years, all life on Earth was in the form of single-cell prokaryotes. |
| All life on Earth originates from the first prokaryotic cells which seem to date back to around [...] billion years ago. | All life on Earth originates from the first prokaryotic cells which seem to date back to around 3.5 billion years ago. |
| In prokaryotes, DNA usually exists as a big [...] (or several [...]), while in eukaryotes, it's in long chains. | In prokaryotes, DNA usually exists as a big loop (or several loops), while in eukaryotes, it's in long chains. |
| In many members of the Domain Archaea, the cell membrane consists of a phospholipid [-layer]. That feature sets them apart from bacteria and eukaryotic cells. | In many members of the Domain Archaea, the cell membrane consists of a phospholipid monolayer, or only one layer of lipid molecules. That feature sets them apart from bacteria and eukaryotic cells. |
| [...]: One-celled eukaryotes that can change the shape of their cells sort of like Aquaman in the Spiderman comics. One kind of [...] causes a disease called [-ic] dysentery | Amoeba: One-celled eukaryotes that can change the shape of their cells sort of like Aquaman in the Spiderman comics. One kind of amoeba causes a disease called amoebic dysentery |
| Paramecium: A kind of one-celled eukaryote that travels through water by [...] | Paramecium: A kind of one-celled eukaryote that travels through water by beating tiny little hairs on its surface (called cilia) like the oars of one of those Greek war ships. |
| [D-s]: One-celled eukaryotic algae (plant-like organisms) that cloak themselves in a hard cell wall made of silica (the tough mineral found in sand). These tiny 'shells' remain long after the cells within them have died. | Diatoms: One-celled eukaryotic algae (plant-like organisms) that cloak themselves in a hard cell wall made of silica (the tough mineral found in sand). These tiny 'shells' remain long after the cells within them have died. |
| Most scientists suggest that eukaryotes arose from [...]. | Most scientists suggest that eukaryotes arose from prokaryotes. |
| More than 30 years ago, biologist Lynn Margulis championed the idea that organelles originated as [...] and were engulfed by other prokaryotic cells. (this idea became endosymbiotic theory) | More than 30 years ago, biologist Lynn Margulis championed the idea that organelles originated as independent prokaryotic cells and were engulfed by other prokaryotic cells. (this idea became endosymbiotic theory) |
| Both mitochondria and chloroplasts contain their own [...], which is separate from the DNA in the cell's nucleus. | Both mitochondria and chloroplasts contain their own DNA, which is separate from the DNA in the cell's nucleus. |
| organelle DNA shares many more traits with [...] DNA than with the eukaryotic DNA found in the nucleus. | organelle DNA shares many more traits with bacterial DNA than with the eukaryotic DNA found in the nucleus. |
Created by:
mr.shapard
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