A northern blot differs from a Southern blot in the
A) type of probe used.
B) presence or absence of a nitrocellulose membrane.
C) size of the genetic sequences involved.
D) number of genetic sequences detected.
E) type of nucleic acid being isolated.
E
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The phenotypic ratio for the F1 generation that results from a testcross between a homozygous individual and a heterozygous individual is
A. 1:1 B. 2:1 C. 3:1 D. 1:2:1
Which of the following bonds is weakest?
a. between two oxygen atoms within molecular oxygen b. between the opposite ions, sodium and chloride c. between the oxygen and hydrogens within a water molecule d. between two water molecules e. between the hydrogens within molecular hydrogen
Unlike angiosperms, gymnosperms like pines have single instead of double fertilization, but otherwise have an identical life cycle. What structure should have the greatest difference between angiosperms and gymnosperms?
A) egg cell B) seedling C) seed D) leaf cell
To replicate this experiment, researchers only needed one population of bacteria, because bacterial populations contain millions of individuals.
a. true b. false