Q - Chapter 2 Flashcards
Chemistry Comes Alive
- The subatomic particles responsible for the chemical behavior of atoms are
a) electrons
b) ions
c) neutrons
d) protons
a) electrons
- In a beaker of water, the water-water bonds can properly be called
a) ionic bonds
b) polar covalent bonds
c) nonpolar covalent bonds
d) hydrogen bonds
d) hydrogen bonds
- The mass number of an atom is
a) equal to the number of protons it contains
b) the sum of its protons and neutrons
c) the sum of all of its subatomic particles
d) the average of the mass number s of all of its isotopes
b) the sum of its protons and neutrons
- A deficiency in this element can be expected to reduce the hemoglobin content of blood
a) Fe
b) I
c) F
d) Ca
e) K
a) Fe
- Factors that accelerate the rate of chemical reactions include all but
a) the presence of catalysts
b) increasing the temperature
c) increasing the particle size
d) increasing the concentration of the reactants
c) increasing the particle size
- When a pair of electrons is shared between two atoms, the bond formed is called
a) a single covalent bond
b) a double covalent bond
c) a triple covalent bond
d) an ionic bond
a) a single covalent bond
- Which of the following elements is necessary for proper conduction of nerve impulses?
a) Fe
b) I
c) P
d) Na
d) Na
- A triglyceride consists of
a) glycerol plus three fatty acids
b) a sugar-phosphate backbone to which two amino groups are attached
c) two to several hexoses
d) amino acids that have been thoroughly saturated with hydrogen
a) glycerol plus three fatty acids
- Water’s importance to living systems reflects
a) its polarity and solvent properties
b) its high heat capacity
c) its high heat of vaporization
d) its chemical reactivity
e) all of these
e) all of these
- 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) RNA is a long, single-stranded molecule made up of the bases A, T, G, and C
d) tDNA is considered a molecular slave of DNA during protein synthesis
b) DNA is a long, double-stranded molecule made up of A, T, G, and C bases
- Which of the following reactions will usually be irreversible regarding chemical equilibrium in human bodies?
a) glucose to CO2 and H2O
b) ADP + Pi to make ATP
c) H2O + CO2 to make H2CO3
d) glucose molecules joined to make glycogen
a) glucose to CO2 and H2O
- You notice that you cannot read your book through a test tube or patient fluid held against the print, as the text appears to be very blurred. There is no precipitant in the bottom of the beaker, though it has been sitting on a rack for several days. What type of liquid is this?
a) solution
b) suspension
c) colloid
d) mixture
c) colloid
- Molecules formed when electrons are shared unequally are
a) salts
b) polar molecules
c) nonpolar molecules
b) polar molecules
- The lipid(s) used as the basis of vitamin D, sex hormones, and bile salts is/are
a) triglycerides
b) cholesterol
c) phospholipids
d) prostaglandin
b) cholesterol
- Which set of terms best describes a proton?
a) negative charge, massless, in the orbital
b) positive charge, 1 amu, in the nucleus
c) uncharged, 1 amu, in the nucleus
b) positive charge, 1 amu, in the nucleus
- Which of the following molecules is an inorganic molecule
a) sucrose
b) cholesterol
c) collagen
d) sodium chloride
d) sodium chloride
- In the body, carbohydrates are stored in the form of
a) glycogen
b) starch
c) cholesterol
d) polypeptides
a) glycogen
- A chemical reaction in which bonds are broken is usually associated with what?
a) the release of energy
b) the consumption of energy
c) a synthesis
d) forming a larger molecule
a) the release of energy
- Acids
a) release hydroxyl ions when dissolved in water
b) are proton acceptors
c) cause the pH of a solution to rise
d) release protons when dissolved in water
d) release protons when dissolved in water
- All of the following are examples of the four major elements contributing to body mass except
a) hydrogen
b) carbon
c) nitrogen
d) sodium
e) oxygen
d) sodium
- A chemist, during the course of an analysis, runs across a chemical composed of carbon, hydrogen, and oxygen in the proportion 1:2:1 and having a six-sided molecular shape. It is probably
a) pentose
b) amino acid
c) fatty acid
d) monosaccharide
e) nucleic acid
d) monosaccharide
- What is DNA
Deoxyribonucleic acid
- Increase the rate of chemical reactions
Enzyme
- Chemical energy used by all cells
Adenosine Triphosphate
