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
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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
Help yourself to —–（）
A. chickens and apples
B. chicken and apple
C. chickens and apple
D. chicken and apples
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