When describing down syndrome, it's important to note that
a. it can be classified as a single-gene disorder
b. it is caused when red blood cells cannot properly form hemoglobin
c. it causes infected males to have low testosterone levels
d. it is usually caused by three copies of chromosome 21

During his workout yesterday, anthony pushed himself by lifting heavier weights. today he is feeling good, but his muscles are sore. what principle is at work in this situation? a. specificity b. progression c. overload d. reversibility

Drea has never had alcohol, but she believes her friends when they tell her that almost everybody at their school drinks on a regular basis. in reality, very few students at the school drink alcohol. which statement best describes what is occurring in this situation? a. peers are influencing what drea thinks of as normal behavior. b. peers are pressuring drea to drink. c. drea is not really influenced by what her peers think. d. drea is giving in to peer pressure.

Which of the following human diseases is caused by a virus that requires reverse transcriptase to transcribe its genome inside the host cell? a) herpesb) aidsc) smallpoxd) influenza