A child demonstrates increasing language skills and an understanding of symbols. Creative play and the use of imagination is an important activity in the child's life. Based upon these characteristics and according to Jean Piaget's theory, what stage of cognitive development is the child demonstrating?
A) Preoperational stage
B) Sensorimotor stage
C) Concrete operational stage
D) Formal operational stage

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Some viruses can be crystallized and their structures analyzed. one such virus is yellow mottle virus, which infects beans. this virus has a single-stranded rna genome containing about 6300 nucleotides. its capsid is 25-30 nm in diameter and contains 180 identical capsomeres.if the yellow mottle virus begins its infection of a cell by using its genome as mrna, which of the following would you expect to be able to measure? a) replication rateb) transcription ratec) translation rated) formation of new transcription factors

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