What is the name of the rod-shaped portions of DNA that are organized in 23 pairs?

Although he has been suffering from insomnia for several months, Brad prefers to avoid prescription drugs because he fears side effects. What hormone available in synthetic form might he consider taking to alleviate his sleep problem?

a) insulin b) melatonin c) epinephrine d) vasopressin

Which of the following subgroups of children have been shown to have delays in the ability to understand the mind of others?

a. children with Williams Syndrome b. typically developing children whose parents are hearing impaired c. children who are hearing impaired whose parents are not hearing impaired d. boys