The origin of the mitochondrion and chloroplast by endosymbiosis, hypothesizes that these organelles originated by
A. the fusion of two archean cells to form the eukaryote with the eukaryotic mitochondrion and chloroplast inside.
B. the absorption of RNA from prokaryotic cells.
C. prokaryotic cells being engulfed and becoming internal symbionts within an early eukaryotic cell.
D. only the absorption of DNA from dead prokaryotic cells used as food.
E. prokaryotic cells being engulfed and becoming external symbionts within an early bacteria cell.
C. prokaryotic cells being engulfed and becoming internal symbionts within an early eukaryotic cell.
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Evidence supporting the idea that mitochondria and chloroplasts in present-day cells originated as independent organisms includes
A. similarity between photosynthetic pigments in chloroplasts and cyanobacteria. B. similarity in the way mitochondria, chloroplasts, and bacteria reproduce. C. similarities in DNA sequences between mitochondrial and bacterial genomes. D. All of the answer choices are correct. E. similarities in size and shape between mitochondria and some bacteria.
The letter "C" from above represents which of
the following? a. the excretory pore b. loops where blood vessels take up solutes from the blood c. sexual reproductive organ of the planarian d. cilia which flick to draw fluid into the planarian e. none of these
Syntrophy is an association between two organisms in which
a) one organism gives off antagonistic substances to prevent the growth of the other b) one of the organisms relies on the waste products of the other for energy or nutrients c) they cooperate to break down a nutrient neither could break down alone d) one benefits while the other is harmed
Which of the following occurs in prophase??
a. sister chromatids attach
b. DNA replicates
c. chromosomes align in the middle of the cell
d. the nuclear envelope breaks down
e. sister chromatids separate