One area of support for the dopamine hypothesis is that

a. a drug that blocks dopamine activity reduces symptoms

b. high levels of dopamine are found in people with parkinson's disease

c. a drug that increases dopamine activity reduces symptoms

d. high-risk children have lower dopamine levels

Which of the following descriptions of proteins are true? i. proteins can have different sequences of amino acids. ii. proteins can have different shapes. iii. proteins can have different numbers of amino acids. a. only i and ii are true. b. only ii and iii are true. c. only i and iii are true. d. i and ii and iii are all true. e. none are true statements

Dna is colied into chromosomes in a cell

What two atoms form a covalent bond a. a sodium and chlorine atom b. an iron and oxygen atom c. two oxygen atoms d. two sodium atoms apex