1. What is the reason for the difference in the synthesis of the leading and lagging strands of DNA molecules?
A.DNA polymerase can join new nucleotides only to the 3' end of the growing strand.
B. One strand must be completely synthesized before synthesis of the next can begin.
C. Helicase and SSB proteins work only at the 5' end of the chromosome.
D. DNA ligase only works in the 3' to 5' direction
E. The origins of replication occur only at the 5' end of the chromosome.
2. Which of the following statements about Golden Rice is false?
A. Golden rice was designed to reduce the incidence of vitamin A deficiency in countries such as Bangladesh.
B. Golden rice was genetically engineered ten years ago.
C. Golden rice has been approved as safe for consumption in the United States.
D. Golden rice contains a gene that produces beta carotene.
3. In a plant cell, a centrosome functions in the formation of
A. duplicate chromosomes.
C. the cell plate.
E. microtubules of the spindle apparatus.
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