In order to distinguish between individuals, DNA genotyping (DNA profiling) detects the difference in short tandem repeats:
A. on unique genes, for example histones (H1A).
B. on a single chromosome, the repeats being approximately 200 bp.
C. on homologs, the repeats being approximately 200 bp.
D. on a single chromosome, the repeats being usually <100 bp.
E. on homologs, the repeats being usually <100 bp.
E
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a. seal the spaces between cells b. allow ions and small molecules to pass between cells c. allow plant cells to communicate with each other d. give the cell its shape e. anchor the cell membrane to the cell wall
The evolution of many species from a single common ancestor is called
a. adaptive radiation b. punctuated equilibrium c. genetic drift d. disruptive selection e. microevolution
Which valve closes when the left ventricle contracts?
a. mitral b. right AV c. tricuspid d. pulmonary semilunar e. aortic semilunar
A virus differs from a bacterium in that a virus ________
A) develops resistance to antibiotics B) is not a living organism C) causes pneumonia D) does not have DNA or RNA