In contrast to linear DNA, circular DNA replication typically:
A. has a single origin of replication.
B. does not produce a replication bubble.
C. occurs only at a single replication fork.
D. does not produce Okazaki fragments.
E. All of the answer options are correct.
A
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Which statement describes the functioning of photosystem II?
A) Light energy excites electrons in the thylakoid membrane electron transport chain. B) Photons are passed along to a reaction-center chlorophyll. C) The P680 chlorophyll donates a pair of protons to NADP+, which is thus converted to NADPH. D) The electron vacancies in P680+ are filled by electrons derived from water. E) The splitting of water yields molecular carbon dioxide as a by-product.
All of the following are included in the Basidiomycetes EXCEPT ________.
A. yeasts B. stolons C. smuts D. puffballs
As a budding basic scientist you work in a research laboratory and discover a chemical that removes the cell wall from bacteria but leaves the organism undamaged otherwise. Things that the bacteria will lose because of this include:
a. The ability to move b. The ability to attach to other cells c. The ability to metabolize d. The ability to use oxygen e. The ability to have a gram stain result
Your research project involves the characterization of a particular signal transduction pathway. Specifically, you have been studying a receptor tyrosine kinase and protein X, which initiates downstream events. You are certain that protein X is part of the signal transduction pathway, but have been unable to identify a direct protein-protein interaction between the receptor tyrosine kinase and the protein X. What should you do next in your attempt to identify a link between the receptor tyrosine kinase and protein X?
A. try to identify an adapter protein that can interact with both the receptor and protein X B. try to identify proteins that act downstream of protein X C. confirm the interaction between the receptor tyrosine kinase and its ligand D. try to identify a coactivator protein