You draw two lines of the same length on a piece of paper. You add arrows pointing outward to one and arrows pointed inward to the other. What illusion are you illustrating?

The CT scans and MRI scans both suggest that the brains of persons suffering from schizophrenia have

a. become swelled by excess fluid. b. shrunk (atrophied). c. become overactive in the frontal lobes. d. tightly-packed surface fissures.

The carriers of genetic information in the form of DNA are the

a. chromosomes. b. ribosomes. c. nucleotides. d. rizomes.