BIOL-1010-Z90 Chapter 2 Focused Reading Quiz
Why are lipids characterized as hydrophobic?
Lipids are characterized as hydrophobic because they are known to be hydrocarbons that mostly include non-polar carbon-carbon or carbon-hydrogen bonds.
What is the definition of a radioactive isotope?
The definition of a radioactive isotope is when some isotopes are unstable and will lose protons, or other subatomic protons, other subatomic particles, or energy to form more stable elements.
What is the purpose of buffers in biological systems?
The purpose of the the buffers in biological systems are to help maintain a steady pH.
Which subatomic particle does not contribute to the atomic mass? a. Electrons b. None of the above. c. Protons d. Neutrons
a. Electrons
Which protein structural level consists of a unique three-dimensional structure of a polypeptide? a. Tertiary structure b. Secondary structure c. Quaternary structure d. Primary structure
a. Tertiary structure
What does the pH scale measure? a. The pH scale measures the hydrogen ion concentration of a solution. b. The pH scale measures the changes in pH by accepting hydroxide ions. c. The pH scale measures the hydroxide ion concentration of a solution. d. The pH scale measures the ratio of acidity to basicity in a solution.
a. The pH scale measures the hydrogen ion concentration of a solution.
Which fat molecule is the least healthy? a. Trans fats b. Omega-3-fatty acids c. Unsaturated fats d. Phospholipids
a. Trans fat
Which water property contributes to certain insect's (ie. wolf spiders, water gliders) ability to glide across the surface of water? a. Water's cohesive ability b. Water's sphere of hydration c. Efficiency as a solvent d. Temperature moderation
a. Water's cohesive ability
Potassium has an atomic number of 19 and mass number of 39. How many neutrons are there? a. 19 b. 20 c. 21 d. 18
b. 20
Which of the following is not a component of a nucleotide? a. Nitrogenous base b. Pentose sugar c. Amino group d. Phosphate group
c. Amino group
Of the four chemical bonds, which bond is found between water molecules? a. Covalent bonds b. Ionic bonds c. Hydrogen bonds d. Van der Waals interactions
c. Hydrogen bonds
What is the maximum number of electrons found in the outermost shells of elements with low atomic numbers? a. 4 b. 6 c. 2 d. 8
d. 8
Oxygen has three isotopes with mass numbers of 16, 17, and 18, respectively. Which isotope contains 8 protons? a. Oxygen-16 and Oxygen-18 contain 8 protons. b. Only Oxygen-16 contains 8 protons. c. Oxygen-16 and Oxygen-17 contain 8 protons. d. All three isotopes contain 8 protons.
d. All three isotopes contain 8 protons.
What are the building blocks of proteins? a. Enzymes b. Coenzymes c. Hormones d. Amino acids
d. Amino acids
What is a unique quality of enzymes? a. Enzymes are the most abundant and diverse organic molecules in living systems. b. Enzymes are signaling macromolecules that regulate specific physiological processes. c. Enzymes are key macromolecules in the continuity of life. d. Enzymes speed up chemical reactions and remain unchanged in the process.
d. Enzymes speed up chemical reactions and remain unchanged in the process.