Physio Quiz 2 Practice Questions

In a DNA molecule, the phosphate serves ________. A) as a code B) as nucleotides C) to hold the molecular backbone together D) to bind the sugars to their bases

Which bonds often bind different parts of a molecule into a specific three-dimensional shape? A) Oxygen B) Amino acid C) Carbon D) Hydrogen

The basic structural material of the body consists of _______. A) Carbohydrates B) Lipids C) Nucleic Acids D) Proteins

Sucrose is a ________. A) disaccharide B) polysaccharide C) monosaccharide D) triglyceride

Which of the following is not considered a factor in influencing a reaction? A) concentration B) time C) particle size D) temperature

What does CH4 mean? A) This is an inorganic molecule. B) There is one carbon and four hydrogen atoms. C) This was involved in a redox reaction. D) There are four carbon and four hydrogen atoms.

The chemical symbol O=O means ________. A) the atoms are double bonded B) zero equals zero C) both atoms are bonded and have zero electrons in the outer orbit D) this is an ionic bond with two shared electrons

An atom with a valence of 3 may have a total of ________ electrons. A) 17 B) 3 C) 13 D) 8

If atom X has an atomic number of 74 it would have which of the following? A) 74 protons B) 37 electrons C) 37 protons and 37 electrons D) 37 protons and 37 neutrons

Atom X has 17 protons. How many electrons are in its valence shell? A) 5 B) 3 C) 10 D) 7

________ is fat soluble, produced in the skin on exposure to UV radiation, and necessary for normal bone growth and function. A) Cortisol B) Vitamin K C) Vitamin A D) Vitamin D

Select the correct statement about isotopes. A) Isotopes occur only in the heavier elements. B) All the isotopes of an element are radioactive. C) Isotopes of the same element have the same atomic number but differ in their atomic masses. D) All the isotopes of an element have the same number of neutrons.

Select the most correct statement regarding nucleic acids. A) Three forms exist: DNA, RNA, and tDNA. B) DNA is a long, double-stranded molecule made up of A, T, G, and C bases. C) TDNA is considered a molecular slave of DNA. D) RNA is a long, single-stranded molecule made up of the bases A, T, G, and C.

Choose the answer that best describes fibrous proteins. A) are cellular catalysts B) are very stable and insoluble in water C) rarely exhibit secondary structure D) are usually called enzymes

Select which reactions will usually be irreversible regarding chemical equilibrium in human bodies. A) glucose molecules joined to make glycogen B) ADP + Pi to make ATP C) H2O + CO2 to make H2CO3 D) glucose to CO2 and H2O

Which of the following statements is false? A) Catalysts increase the rate of chemical reactions. B) Larger particles move faster than smaller ones and thus collide more frequently and more forcefully. C) Chemical reactions progress at a faster rate when the reacting particles are present in higher numbers. D) Chemical reactions proceed more quickly at higher temperatures.

Carbohydrates and proteins are built up from their basic building blocks by the ________. A) removal of a water molecule between each two units B) removal of a nitrogen atom between each two units C) addition of a water molecule between each two units D) addition of a carbon atom between each two units

What is a chain of 25 amino acids called? A) starch B) protein C) nucleotide D) polypeptide

What is a chain of 50 amino acids called? A) starch B) protein C) nucleotide D) polypeptide

The numbers listed represent the number of electrons in the first, second, and third energy levels, respectively. On this basis, which of the following is an unstable or reactive atom? A) 2 B) 2, 8 C) 2, 8, 1 D) 2, 8, 8

A chemical reaction in which bonds are broken is usually associated with ________. A) a synthesis B) the consumption of energy C) forming a larger molecule D) the release of energy

Which of the following does not describe enzymes? A) Each enzyme is chemically specific B) Some enzymes are purely protein C) Enzymes work by raising the energy of activation D) Some enzymes are protein plus a cofactor

The single most abundant protein in the body is ________. A) DNA B) glucose C) collagen D) hemoglobin

The genetic information is coded in DNA by the ________. A) regular alteration of sugar and phosphate molecules B) sequence of the nucleotides C) arrangement of the histones D) three-dimensional structure of the double helix