Phys Exam 1: Ch 2

30) Which bases below are purines? 1. adenine 2. cytosine 3. guanine 4. thymine 5. uracil A) 1 and 2 B) 2 and 3 C) 1, 3, and 5 D) 1 and 3 E) 2, 4, and 5

D Section Title: Molecules and Bonds Learning Outcome: 2.1

25) The concentration of a solution expresses the amount of A) solvent per volume of solute. B) solute per volume of solvent. C) solvent per volume of solution. D) solute per volume of solution. E) None of the answers are correct.

D Section Title: Noncovalent Interactions Learning Outcome: 2.5

31) Polymers are a typical formation of ________ molecules. A) organic B) inorganic C) either organic or inorganic

A Section Title: Molecules and Bonds Learning Outcome: 2.1

96) Which of the following elements combine to form nonpolar covalent bonds? A) carbon and hydrogen B) nitrogen and hydrogen C) sodium and chlorine D) hydrogen and oxygen E) carbon and chlorine

A Section Title: Molecules and Bonds Learning Outcome: 2.4

104) Only free H+ contributes to the hydrogen ion concentration. A) True B) False

A Section Title: Noncovalent Interactions Learning Outcome: 2.5

1) Stanley Miller set out to demonstrate an explanation for the origins of organic molecules using a combination of simple organic molecules, heat and periodic burst of electricity through the mixture, ultimately producing what kind of molecules? A) carbohydrates B) amino acids C) lipids D) glycoproteins E) nucleic acids

B Section Title: Molecules and Bonds Learning Outcome: 2.1

105) In the equation CO2 + H2O H2CO3 H+ + HCO3-, which of these is an acid? A) HCO3- B) H2CO3 C) H2O D) CO2 E) H+

B Section Title: Noncovalent Interactions Learning Outcome: 2.7

37) Which of the following is a common feature of soluble proteins? A) structural support B) noncovalent interaction C) receptor binding D) chemical modulation E) All of the answers are correct.

B Section Title: Protein Interactions Learning Outcome: 2.6

109) Most of the fat found in the human body is in the form of A) steroids. B) phospholipids. C) triglycerides. D) prostaglandins. E) monoglycerides.

C Section Title: Molecules and Bonds Learning Outcome: 2.1

36) Protein specificity is A) the activation of a specific protein that is needed to perform a particular function. B) the degree to which a protein is attracted to a ligand. C) the ability of a protein to bind a certain ligand or a group of related ligands. D) the degree to which a protein-ligand complex initiates a response. E) the degree to which a protein is attracted to a ligand and the ability of a protein to bind a certain ligand or a group of related ligands.

C Section Title: Protein Interactions Learning Outcome: 2.9

7) Chromium is A) a major essential element. B) a minor essential element. C) a dietary supplement with no natural role in the body. D) None of the answers are correct.

D Section Title: Running Problem Learning Outcome: 2.1

11) Essential amino acids that are used to build proteins A) exist in twenty six different configurations. B) are linked together by ionic chemical bonds in proteins. C) can be used medically for both diagnosis and treatment of diseases. D) can be derived from the foods we eat and digest. E) can only be made by cells within our bodies.

E Section Title: Molecules and Bonds Learning Outcome: 2.1

20) All of these statements about carbohydrates are true except one. Identify the exception. A) Simple sugars include lactose, glucose, and ribose. B) Cellulose is the most abundant carbohydrate on earth. C) Glycogen is a storage polysaccharide made by animal cells. D) Polysaccharides are important both for energy storage and to provide structure to cells. E) Glycogen is important both for energy storage and to provide structure for cells.

E Section Title: Molecules and Bonds Learning Outcome: 2.1

16) A free radical is a A) charged particle. B) molecule with an extra electron. C) molecule with an extra neutron. D) molecule with an extra proton. E) molecule with an unpaired electron.

E Section Title: Molecules and Bonds Learning Outcome: 2.2