1) in 1980, teh volcano Mt St. Hleen\'s erupted, killing all teh flora and fauna
ID: 87340 • Letter: 1
Question
1) in 1980, teh volcano Mt St. Hleen's erupted, killing all teh flora and fauna. slowly, the first hearty organisms begna to return , and now, 34 years later many of the original organism have begun to grow back. what's the name of this regrowth process?
a) ecological rejuvenation
b) ecological destruction
c) pioneering
d) ecological succession
e) species progression.
2) the dna of mirochondria and chloroplast are more similar to the dna of bacteria than to cellular dna. additionally, mitochondria and chloroplasts are morphologically similar to bacteria. these facts provide evidence that support the hypothesis that
a) mitochondria and chloroplasts evolved from within early eukaryotic cells.
b) chloroplasts evolved from ribosomes within early eukaryotic cells
c) mitochondria and chloroplasts evolved from bacteria that were engulfed by early eukaryotic cells.
d) none of these are correct
Explanation / Answer
1. ANS: D. Ecological succession.
Explanation: Ecological succession is a biological process in which a biological community evolves over time. Two different types of succession—primary and secondary
Primary succession is initiated in a new area.
Secondary succession occurs when an area that has previously had an ecological community is so disturbed or changed that the original community was destroyed. It is often the result of natural disasters such as fires, floods, and wind.
2. ANS: C. Mitochondria and chloroplasts evolved from bacteria that were engulfed by early eukaryotic cells.
Explanation: Both mitochondria and chloroplasts mostly have common features. Both organelles have their own genomes (a closed circle of DNA), and use protein translation machinery (ribosomes) that is distinct from cellular ribosomes.
Bacteria have circular DNA genomes; mitochondria and chloroplast ribosomes are more similar to bacterial ribosomes; and binary fission is a bacterial mode of replication. So in the scientific sense mitochondria and chloroplasts are the endosymbionic remnants of once free-living bacteria.
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