Which one of the following statements about endosymbiosis and the origin of the eukaryotic cell is FALSE?
A. Mitochondria are the descendants of purple bacteria.
B. The chloroplasts of red and green algae are the descendants of cyanobacteria.
C. Algae incorporated prokaryotic cells that became chloroplasts, but never acquired mitochondria.
D. Many compartments of the eukaryotic cell are derived from the endomembrane system.
E. Ultimately, both the chloroplast and the mitochondria of eukaryotes are descendants of prokaryotic cells.
C. Algae incorporated prokaryotic cells that became chloroplasts, but never acquired mitochondria.
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An organism's genome is analyzed and found to contain 18% thymine. What percentage of that organism's DNA is cytosine?
A. 32% B. 18% C. 82% D. 64% E. 36%
Fibroblast cells are a good model system for studying muscle differentiation because
A. they are totipotent B. they never differentiate into muscle cells in a normally developing animal C. they can differentiate into muscle cells in a normally developing animal D. they express a limited number of genes E. they have a small genome
During the last two months of fetal development of the female, sex hormones cause bone remodeling of the pelvic girdle that adapts it for pregnancy and birth
Indicate whether the statement is true or false
Atoms are to molecules as __________.
A. atoms are to tissues B. tissues are to cells C. organ systems are to cells D. tissues are to organs E. cells are to organ systems