The basic units of structure in all living organisms are the what? is it organelles , chromosomes , or cells.

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

What is called the "building block" of life?

Which of the following is a way that minerals are used? a. industry construction technology d. all of the above