Which of the following features of DNA organization do eukaryotes and bacteria have in common (select all correct choices)?
A. DNA is associated with basic proteins.
B. DNA is found within a 30 nm filament.
C. DNA breakage in one loop will not affect DNA in other loops.
D. A change of supercoiling in a cleaved loop would not affect other loops.
E. Under electron microscope, DNA will have a beads-on-a-string appearance.
A, C, D
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A protein that regulates transcription by binding to the operator is known as the
A. operon. B. repressor. C. promoter. D. operator. E. CAP.
Each of the following are features of a cloning vector except
A. capacity for large inserts. B. reverse transcriptases. C. genetic markers used to screen for recombinants. D. origin of replication. E. multiple cloning sites.
A particular virus consists of only DNA and proteins. Viruses attach to the surface of a host cell and inject the viral DNA into the host. The host cell then copies the viral DNA and makes new viruses
Eventually, the host cell is killed, and the new viruses are released. These new viruses search for new hosts to continue the cycle. Identify and apply at least three characteristics of life to justify whether a virus is a living thing.
If oxygen is present during high-LET radiation the effect of radiation is?
a) reduced b) minimal c) maximal d) the same