Biology 1200 Exam 3 Questions And All
Correct Answers.
Eukaryotes - Answer range in size from single celled organisms to mammals, have genetic
material contained in a membrane bound nucleus and other membrane bound cellular
organelles and mitosis
Endosymbiotic origin of eukaryotes - Answer When predator protists undergo endosymbiosis,
they engulf a photosynthetic cell, it loses its nucleus, and the chloroplast is retained with either
2 or 4 membranes surrounding it. (mitochondria). Mitochondria are bacterial size, replicate by
fission and are independent of the nucleus, have their own ribosomes and manufacture their
own proteins, and have their own genomes
Mitochondria are most closely related to what group of bacteria? - Answer a-proteobacteria
What group are chloroplasts most closely related to? - Answer cyanobacteria
Difference between primary and secondary endosymbiosis - Answer Primary endosymbiosis is
the process in which a eukaryote engulfs another living prokaryote. Secondary endosymbiosis is
when a eukaryote cell engulfs another eukaryote cell that has undergone primary
endosymbiosis. In secondary, after the cell is engulfed it becomes dependent on the larger cell.
You can tell which one happened because there is a whole other layer in secondary
endosymbiosis.
Evolution of multicellularity in protists - Answer The transition to multicellularity may result
from changes in how existing genes are used rather than the origin of large numbers of novel
genes
-a second wave of diversification occurred when multicellularity evolved and gave rise to algae,
plants, fungi, and animals
-multicellular organisms with differentiated cells originated multiple times over the course of
eukaryotic evolution
Do protists form a monophyletic group? - Answer no
Human interests in protists - Answer produce oxygen, are used in medical research, are an
important part of the food chain, are used in food, and help to recycle the nutrients necessary
Correct Answers.
Eukaryotes - Answer range in size from single celled organisms to mammals, have genetic
material contained in a membrane bound nucleus and other membrane bound cellular
organelles and mitosis
Endosymbiotic origin of eukaryotes - Answer When predator protists undergo endosymbiosis,
they engulf a photosynthetic cell, it loses its nucleus, and the chloroplast is retained with either
2 or 4 membranes surrounding it. (mitochondria). Mitochondria are bacterial size, replicate by
fission and are independent of the nucleus, have their own ribosomes and manufacture their
own proteins, and have their own genomes
Mitochondria are most closely related to what group of bacteria? - Answer a-proteobacteria
What group are chloroplasts most closely related to? - Answer cyanobacteria
Difference between primary and secondary endosymbiosis - Answer Primary endosymbiosis is
the process in which a eukaryote engulfs another living prokaryote. Secondary endosymbiosis is
when a eukaryote cell engulfs another eukaryote cell that has undergone primary
endosymbiosis. In secondary, after the cell is engulfed it becomes dependent on the larger cell.
You can tell which one happened because there is a whole other layer in secondary
endosymbiosis.
Evolution of multicellularity in protists - Answer The transition to multicellularity may result
from changes in how existing genes are used rather than the origin of large numbers of novel
genes
-a second wave of diversification occurred when multicellularity evolved and gave rise to algae,
plants, fungi, and animals
-multicellular organisms with differentiated cells originated multiple times over the course of
eukaryotic evolution
Do protists form a monophyletic group? - Answer no
Human interests in protists - Answer produce oxygen, are used in medical research, are an
important part of the food chain, are used in food, and help to recycle the nutrients necessary
