Double strand DNA fragments are separated by size using
A) restriction analysis.
B) FISH.
C) PCR.
D) northern blotting.
E) gel electrophoresis.
E
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A CD4+ T cell binds to an antigen only if this antigenis ____
a. in a complex with a class I MHC protein b. in a complex with a class II MHC protein c. in a complex with a class III MHC protein d. not in a complex with MHC proteins e. presented on the surface of a B cell
How can we identify a particular element?
a. By its number of protons b. By its number of electrons c. By its number of neutrons d. By its shape of valence shells e. By its amount of energy levels
Retroviruses have a(n) DNA polymerase called reverse transcriptase, which transcribes the RNA genome into a DNA
intermediate. ____________________ Indicate whether the statement is true or false.
A farmer uses triazine herbicide to control pigweed in his field. For the first few years, the triazine works well and almost all the pigweed dies; but after several years, the farmer sees more and more pigweed. Which of these explanations best explains what happened?
A) The herbicide company lost its triazine formula and started selling poor-quality triazine. B) Natural selection caused the pigweed to mutate, creating a new triazine-resistant species. C) Triazine-resistant pigweed has less-efficient photosynthesis metabolism. D) Triazine-resistant weeds were more likely to survive and reproduce.