1. Endosymbiosis envolved just once in the history of life. (True or False) 2. S
ID: 77995 • Letter: 1
Question
1. Endosymbiosis envolved just once in the history of life. (True or False)
2. Symbiosis is when two organisms cooperate. Endosymbiosis is when one organsism cooperates from inside another organism host (True or False)
3. Complex cells - eukaryotes - are at least 2 Ga. (True or False)
4. Which of the following traits does not define eukaryotes? A. Have sex, B. Have about 1000 times the DNA of a prokaryote, C. DNA is housed within a membrane bound structure called the nucleus, D. Are usually half the volume of a prokaryote, E. Have organelles
5. Stromatolites are a type of: A Body fossil, B. Chemical Biomaker C. Trace fossil
Explanation / Answer
Answer 1. TRUE (As explained below)
Endosymbiosis is believed to have been the reason for evolution of the organized cell with organelles such as mitochondria when the mitochondria moved into the eukaryotic cells for survival and endosymbiosis happened that one time in history.
Answer 2: TRUE. (As explained below)
Endosymbiosis is like explained above, a living entity in symbiotic relationship within another living entity. When the entities are not inside each other, it is simple symbiosis.
Answer 3: TRUE. (As explained below)
The oldest eukaryotic microfossils that can be considered as unambiguous date back to approximately 2 Ga.
Answer 4: D. (As explained below)
Eukaryotes can reproduce sexually. So, option A is correct. Every cell of eukaryotes has a nucleus and in every cell, there is a DNA. So, yes, eukaryotes can have a substantially high number of DNA than prokaryotes. Option B is correct. Eukaryotes have nucleus. So, option C is correct. Eukaryotes are usually larger than prokaryotes. So, option D is incorrect. Eukaryotic cells have organelles. So, option E is correct.
Answer 5: C. Trace fossil (As explained below)
Trace fossils bear traces like footprints and feces of animals rather than the actual body of the animal. Stromatolites bear fossilized algal mounds and are classified as trace fossils.
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