The atomic weight is only an average of relative weights of an atom and its isotopes, and it may vary from the weight of a specific isotope. |
TRUE |
Emulsions and colloids are the same thing. |
TRUE |
Chemical properties are determined primarily by neutrons. |
FALSE |
A charged particle is generally called an ion. |
TRUE |
Isotopes differ from each other only in the number of electrons contained. |
FALSE |
About 60% to 80% of the volume of most living cells consists of organic compounds. |
FALSE |
Lipids are a poor source of stored energy. |
FALSE |
Current information theorizes that omega-3 fatty acids decrease the risk of heart disease. |
TRUE |
Glucose is an example of a monosaccharide. |
TRUE |
A molecule consisting of one carbon atom and two oxygen atoms is correctly written as CO2. |
TRUE |
The lower the pH, the higher the hydrogen ion concentration. |
TRUE |
Covalent bonds are generally less stable than ionic bonds. |
FALSE |
Hydrogen bonds are comparatively strong bonds. |
FALSE |
The fact that no chemical bonding occurs between the components of a mixture is the chief difference between mixtures and compounds. |
TRUE |
Alpha particles, although relatively weak energy particles, are second only to smoking as a cause of lung cancer. |
TRUE |
No chemical bonding occurs between the components of a mixture. |
TRUE |
All organic compounds contain carbon. |
TRUE |
A dipeptide can be broken into two amino acids by dehydration synthesis. |
FALSE |
The pH of body fluids must remain fairly constant for the body to maintain homeostasis. |
TRUE |
Mixtures are combinations of elements or compounds that are physically blended together but are not bound by chemical bonds. |
TRUE |
Buffers resist abrupt and large changes in the pH of the body by releasing or binding ions. |
TRUE |
Which of the following elements is necessary for proper conduction of nervous impulses? |
D) Na |
Choose the statement that is false or incorrect. |
D) A key feature of the body’s metabolism is the almost exclusive use of exergonic reactions by the body. |
In general, the lipids that we refer to as oils have ________. |
D) a high degree of unsaturated bonds |
The genetic information is coded in DNA by the ________. |
B) sequence of the nucleotides |
Which of the following is not true of proteins? |
C) They appear to be the molecular carriers of the coded hereditary information. |
The single most abundant protein in the body is ________. |
C) collagen |
Carbohydrates are stored in the liver and muscles in the form of ________. |
C) glycogen |
Which of the following describes coenzymes? |
A) organic molecules derived from vitamins |
Which of the following is not a role of molecular chaperonins? |
E) act as a biological catalyst |
A chemical reaction in which bonds are broken is usually associated with ________. |
A) the release of energy |
Salts are always ________. |
A) ionic compounds |
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? |
D) 2, 8, 1 |
A solution that has a pH of 2 could best be described as being ________. |
A) acidic |
Which of the following is the major positive ion outside cells? |
D) sodium |
Which of the following would be regarded as an organic molecule? |
D) CH4 |
What is a chain of 25 amino acids called? |
A) polypeptide |
Which of the following constitutes a long chain of simple sugars? |
B) polysaccharide |
What level of protein synthesis is represented by the coiling of the protein chain backbone into an alpha helix? |
B) secondary structure |
Carbohydrates and proteins are built up from their basic building blocks by the ________. |
C) removal of a water molecule between each two units |
Which statement about enzymes is false? |
A) Enzymes raise the activation energy needed to start a reaction. |
Which of the following statements is false? |
C) Larger particles move faster than smaller ones and thus collide more frequently and more forcefully. |
Which of the following is true regarding the concentration of solutions? |
B) Molarity is one mole of solute per 1000 ml of solution. |
Select the statement about mixtures that is correct. |
A) A solution contains solvent in large amounts and solute in smaller quantities. |
Choose the answer that best describes HCO3-. |
A) a bicarbonate ion |
Select which reactions will usually be irreversible regarding chemical equilibrium in living systems. |
A) glucose to CO2 and H2O |
What happens in redox reactions? |
A) both decomposition and electron exchange occur |
Choose the answer that best describes fibrous proteins. |
B) are very stable and insoluble in water |
Which of the following does not describe the ATP molecule? |
D) pigments |
Select the most correct statement regarding nucleic acids. |
B) DNA is a long, double-stranded molecule made up of A, T, G, and C bases. |
Which of the following is an example of a suspension? |
D) blood |
Select the correct statement about isotopes. |
A) Isotopes of the same element have the same atomic number but differ in their atomic masses. |
The four elements that make up about 96% of body matter are ________. |
C) carbon, oxygen, hydrogen, nitrogen |
An example of a coenzyme is ________. |
B) riboflavin (vitamin B2) |
________ is fat soluble, produced in the skin on exposure to UV radiation, and necessary for normal bone growth and function. |
D) Vitamin D |
In liquid XYZ, you notice that light is scattered as it passes through. There is no precipitant in the bottom of the beaker, though it has been sitting for several days. What type of liquid is this? |
C) colloid |
Atom X has 17 protons. How many electrons are in its valence shell? |
C) 7 |
Which protein types are vitally important to cell function in all types of stressful circumstances? |
B) molecular chaperones |
If atom X has an atomic number of 74 it would have which of the following? |
D) 37 protons and 37 electrons |
What does the formula C6H12O6 mean? |
B) There are 12 hydrogen, 6 carbon, and 6 oxygen atoms. |
Two good examples of a colloid would be Jell-O® and ________. |
D) cytosol |
An atom with a valence of 3 may have a total of ________ electrons. |
C) 13 |
Which of the following is a neutralization reaction? |
D) HCl + NaOH → NaCl + H2O |
The chemical symbol OO means ________. |
C) the atoms are double bonded |
What is a dipole? |
B) a polar molecule |
What does CH4 mean? |
A) There is one carbon and four hydrogen atoms. |
Amino acids joining together to make a peptide is a good example of a(n) ________ reaction. |
A) synthesis |
Which of the following is not considered a factor in influencing a reaction? |
D) time |
Which of the following is not an electrolyte? |
C) H2O |
Which property of water is demonstrated when we sweat? |
B) high heat of vaporization |
Sucrose is a ________. |
B) disaccharide |
What is the ratio of fatty acids to glycerol in neutral fats? |
C) 3:1 |
In a DNA molecule, the phosphate serves ________. |
B) to hold the molecular backbone together |
Heat shock proteins (hsp) are a type of protein called ________. |
D) chaperonins |
Which bonds often bind different parts of a molecule into a specific three-dimensional shape? |
B) Hydrogen |
The atomic number is equal to the number of ________. |
protons (and electrons) |
Molecules such as methane that are made of atoms that share electrons have ________ bonds. |
covalent |
An atom with three electrons would have a valence of ________. |
one |
AB → A + B is an example of a(n) ________ reaction. |
decomposition |
________ have a bitter taste, feel slippery, and are proton acceptors. |
Bases |
A holoenzyme is composed of an apoenzyme and a(n) ________. |
cofactor |
In a DNA molecule, guanine would connect to ________. |
cytosine |
The ________ molecule directly provides energy for cellular work. |
ATP |
Hydrogen bonds are more like a type of weak ________ than true bonds. |
attraction |
Weak acids and bases make good ________. |
buffers |
Starch is the stored carbohydrate in plants, while ________ is the stored carbohydrate in animals. |
glycogen |
How many phosphates would AMP have attached to it? |
one |
Which metals have a toxic effect on the body? |
heavy |
Chapter 2- Chemistry Comes Alive
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