If agarose gel electrophoresis is performed and the marker is not used, what information will be lost?
A) The DNA bands will not stain properly
B) The DNA bands will not migrate properly
C) The size of the DNA bands cannot be determined.
C) The size of the DNA bands cannot be determined.
Feedback: The DNA marker is used to construct a standard curve for size determination of the bands.
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Which of the following characteristics is shared by a hagfish and a lamprey?
A) a rasping tongue B) paired fins C) jaws D) a well-developed notochord
Arrange the following steps of the HIV life cycle in order:1.Viral
RNAs and proteins assemble into new viral particles that bud from the cell. 2.DNA copy of the viral genome is integrated into the host genome. 3.Viral reverse transcriptase makes a DNA copy of the viral RNA genome. 4.Viral particle enters the cell. 5.The provirus is transcribed into viral RNA genomes and mRNAs to make viral proteins.
a. 3,2,5,1,4 b. 2,3,4,5,1 c. 4,2,3,1,5 d. 2,4,3,5,1 e. 4,3,2,5,1
You wish to learn if the initiation of root hair formation depends on either translation or transcription. Roots were treated with actinomycin D, cycloheximide, and mock treated with a control solution without either of the two inhibitors. You find that root hair initiation was inhibited when mock treated with the control solution and in the presence of either cycloheximide or actinmycin D. From this you can conclude that:
A) Both transcription and translation are required. B) Only transcription is required. C) Only translation is required. D) More data is needed.
Which of the following best expresses the concept of natural selection?
A) reproductive success influenced by inherited characteristics B) inheritance of acquired characteristics C) change in response to need D) a process of constant improvement, leading eventually to perfection