The contribution of Gilbert and Sanger to modern genetics was to（）
A. develop a method for sequencing DNA
B. develop the PCR technique
C. discover DNA in the nucleus of cells
D. describe the structure of DNA
E. show that genes were made of DNA
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The attachment point on the chromosome for spindle microtubules is the（）
A. centromere
B. telomere
C. origin of replication
D. sister chromatid
E. sister chromatid
Which of the following species is considered a genetic model organism（）
A. the worm, Caenorhabditis elegans
B. the plant, Linaria vulgaris
C. the deer mouse, Peromyscus maniculatus
D. the frog, Hyla chrysoscelis
E. the chimpanzee, Pan troglodytes
Genetic information can be carried in which of the following biomolecules（）
A. Either DNA or RNA
B. Proteins
C. DNA and not RNA
D. RNA and not DNA
—-do you visit your grandparents？ Once a week（）
A. How long
B. How soon
C. How often
D. How many
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