Which of the following is a feature of vitamins? a. several may be oxidized to yield 4 kcalories per gram. b. the quantities present in foods are measured in micrograms or milligrams. c. structurally, many are found linked together. d. many serve in the role of enzyme inhibitors. e. some are both water- and fat-soluble.

How many variables are altered in a good experiment? a.1 b.0 c.2 d.3

Which of the following represents a negatively charged ion? of t 7

Select the correct answer. which mutation is harmful to the organism? a. a mutation allowing moths to camouflage better on blackened tree bark b. a mutation making staphylococcus aureus resistant to the antibiotic methicillin c. a mutation inhibiting human immunodeficiency virus from attaching to and entering the cell d. a mutation causing uncontrolled cell division e. a mutation giving plant leaves a bitter taste to discourage herbivores from eating them