You wish to obtain a purified sample of mitochondria from lysed cells. The best way to obtain this sample would be
A) centrifugation.
B) chromatography.
C) polyacrylamide gel electrophoresis.
D) agarose gel electrophoresis.
E) both centrifugation and polyacrylamide gel electrophoresis.
Answer: A
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The choice of whether a particular organism
belongs to the experimental group or the control group should be based on a. age. b. size. c. chance. d. designation by the experimenter. e. sex.
Each individual bacterial colony contains ____ recombinant plasmid as/than the other colonies on the plate, and the
DNA sequence of the recombinant plasmid present in any given colony can be identified using a ____. a. a different; DNA chip b. the same; DNA chip c. the same; DNA probe d. a different; Western blot e. a different; DNA probe
Since all living things contain DNA, how can there be so many kinds of living organisms and not just one?
A) all species have the same DNA, but each uses only those sections appropriate for the species B) the order of the bases is unique, not only for each species but for almost every individual as well C) all living things have the same DNA but make variable RNAs when producing the proteins that make each species unique D) different species read or decode the nucleotide sequence in different ways E) this remains one of the great unanswered questions in biology
Cytokinesis typically begins during which stage of mitosis?
a. prophase b. prometaphase c. metaphase d. anaphase e. telophase