Explain how the discovery of cytoskeletal elements in prokaryotes contributed to the current understanding of the endosymbiont theory
What will be an ideal response?
Answer: The tubulin-like protein FtsZ is involved in bacterial cell division. Expression of FtsZ in chloroplasts and some mitochondria and its involvement in chloroplast division is evidence that chloroplasts and mitochondria originally were endosymbionts in the original eukaryotic cells.
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Which of the following is true of DNA polymerase I?
A. It carries out lagging strand synthesis. B. It does not require the presence of a 3'-OH in order to initiate synthesis of DNA. C. It is responsible for RNA primer removal and replacement with DNA nucleotides. D. It seals the gaps or nicks produced during lagging strand synthesis. E. All of these choices are correct.
If similarities between two structures in different organisms reflect independent evolution, these structures are
A. analogous. B. vestigial. C. homeotic. D. homologous. E. heterologous.
Primitive reptiles first appeared during the _____ period.
A. Carboniferous B. Cambrian C. Devonian D. Ordovician E. Silurian
When creating transgenic animals, as contrasted with the creation of transgenic bacteria,
a. it is necessary to carry out the procedure completely by hand. b. animals need donor eggs to contain the genetic material, while bacteria can have the new genes inserted into any bacterial cell. c. transgenic animals can be created in large numbers, while bacteria must be created one at a time to control contamination. d. the membranes of the bacteria must be disrupted to allow the genes to be taken up into the cell and animals do not require the host cell membrane to be disrupted. e. the membranes of the animal cell must be disrupted to allow the genes to be taken up into the cell and bacteria do not require the host cell membrane to be disrupted.