Ancestral Host Cells
Modern Cells
after many
generations
of evolution
aerobic
bacterium
cyanobacterium
mitochondrion
chloroplast
Which of the following explains why Margulis's endosymbiotic theory is widely accepted today?
A. Mitochondria and chloroplasts have been found free floating near hydrothermal vents in the ocean
B.
Mitochondria and chloroplasts are found in cells of all prokaryotic organisms
C.
Mitochondria and chloroplasts replicate differently than the cells they are found in
D.
Mitochondria and chloroplasts have their own DNA similar to DNA found in bacteria and archaebactena

Use this diagram of an animal cell to answer the question. where does the first stage of cellular respiration occur? w x y z

Interpret the model. a three-part model with black right-arrows between the parts. left part: a large green apple-shaped component with a w-shaped indentation centered on top. a small blue apple-slice shape sits above the left indentation and an arrow points from the shape to the indentation. a small purple apple-slice shape and arrow sit above the right indentation and an arrow points from the shape to the indentation. middle part: a large green apple-shaped component with a square indentation centered on top. sitting in the left side of the indentation is a blue apple-slice shape with a flat bottom, fused to a purple apple-slice shape with a flat bottom on the right side of the indentation. right part: a large green apple-shaped component with a w-shaped indentation centered on top. an up-arrow is centered above the indentation pointing to a fused blue and purple apple-slice-shaped flat-bottom component sitting above the indentation. assigne "true" or "false" to the end of each statement. the model shows a shape change occurring in the enzyme after the substrate is bound in the active site. t/fthere are two products in this model. t? f there are three substrates in this model. t/f the model shows two different enzymes. t/f

Jason adds the antibiotic penicillin to a bacterial culture. the bacteria develop genetic modifications in their genome, which gives them resistance to the antibiotic penicillin. what caused this genetic modification?