21.

Error! File

Which molecule would REQUIRE a channel or transport to cross the cell membrane?

a) CO₂

b) H₂O

c) K⁺

d) O₂

22.

Error! File

The theory of endosymbiosis suggests that chloroplast and mitochondria were once free-living prokaryotes, that were engulfed by larger prokaryotic cells. Eventually this relationship lead to the development of eukaryotic cells with cellular organelles. These organelles included mitochondria and in some cases chloroplasts. Which of this is not supported by the endosymbiosis theory concerning organelles?

a) contain DNA

b) contain ribosomes

c) are capable of living independently

d) are surrounded by a double membrane

23.

\fLength of Marker Sample A Sample B Sample C DNA fragment (base pairs) 1,000 bp 900 bp 800 bp 700 bp IIII 600 bp 500 bp 400 bp 300 bp 200 bp 100 bp