Biological Molecules Quiz Questions
- 1.The structural formula for a certain molecule includes a group symbolized -O. The dash next to the oxygen atom means that a single bond exists to another atom, such as a carbon. Based on the valence of oxygen and the number of bonds it normally forms, what is the charge on the oxygen atom in this case?
- A.
-2
- B.
-1
- C.
+1
- D.
+2
- 2.When the atoms involved in a covalent bond have the same electronegativity, what type of bond results?
- A.
Ionic bond
- B.
Polar covalent bond
- C.
Nonpolar covalent bond
- D.
Hydrogen bond
- 3.Using its antennae, the male moth finds female moths by following a trail of airborne chemicals, called pheromones, upwind from the female producing them. This is an example of...
- A.
Reproduction
- B.
Response to stimuli
- C.
Grow
- D.
Acquire nutrients
- E.
Homeostasis
- 4.All of the following are TRUE about living organisms EXCEPT...
- A.
Reproduce themselves
- B.
Grow into multicellular organisms
- C.
Have an active metabolism
- D.
Are made of cells
- E.
Respond to stimuli
- 5.The atomic number of an atom is defined as
- A.
The number of protons and neutrons in the nucleus
- B.
The number of electrons in outermost shell
- C.
The number of protons in the nucleus
- D.
Total number of electrons and neutrons
- E.
Number of energy shells
- F.
Arrangement of neutrons in nucleus
- 6.After you drink acidic lemonade, your body stays at the same pH. This is an example of...
- A.
Maintaining homeostasis
- B.
Growth
- C.
Evolve in response to environment
- D.
Behavior
- E.
Maintain cellular organization
- F.
Immunization to weak acids
- 7.If an atom has a charge of +1 that means...
- A.
It has 1 more neutron than protons and electron
- B.
It has 1 more proton than electrons
- C.
It has 1 more electron than protons
- D.
It has same number of protons and electrons
- 8.Phosphorous has an atomic number of 15, in the first shell it has [Blank] electrons, second shell has [Blank] electrons, and third shell has [Blank] electrons.
- 9.Which elements are the most common in the human body?
- A.
Carbon
- B.
Calcium
- C.
Potassium
- D.
Nitrogen
- E.
Oxygen
- F.
Hydrogen
- G.
Phosphorus
- 10.Most biological bonds in the body are..
- A.
Covalent
- B.
Ionic
- C.
Hydrogen
- D.
Peptide
- 11.How many electrons are involved in a single covalent bond?
- 12.You isolate a molecule and determine it is nonpolar. Based on this property, the molecule is largely composed of the elements [Blank] and [Blank].
- 13.Which elements are the most electronegative (polar) in the body?
- A.
Carbon
- B.
Nitrogen
- C.
Oxygen
- D.
Hydrogen
- 14.An atom has six electrons in its valence shell. How many single covalent bonds would you expect it to form in most circumstances?
- A.
2
- B.
3
- C.
4
- D.
6
- E.
1
- 15.What does H-O-H represent?
- 16.The smallest units that still retain the characteristics of an element are called
- 17.Water is less dense as a solid than as a liquid.
- A.
True
- B.
False
- 18.Which is the correct sequence of increasing organization? (start from beginning)[Blank], [Blank], [Blank], [Blank], [Blank], [Blank], [Blank], [Blank], [Blank] and [Blank].
- 19.Nitrogen (N) normally forms only three covalent bonds because it has a valence of five. However, ammonium has four covalent bonds, each to a different hydrogen (H) atom (H has a valence of one). Make a sketch of this molecule. Count the number of electrons in your sketch. Compare this number to the number of valence electrons in one N and four H's. What do you predict to be the charge on this molecule?
- A.
+1
- B.
-2
- C.
-1
- D.
+2
- E.
+3
- 20.Which of the following is true of carbon?
- A.
It can form polar and nonpolar bonds.
- B.
It only forms polar molecules.
- C.
It is highly electronegative.
- D.
It can form a maximum of three covalent bonds with other elements.
- 21.For an atom to achieve maximum stability and become chemically inert, what must occur?
- A.
Electron pairs are shared.
- B.
Its outermost energy shell must be filled with electrons.
- C.
The number of electrons must equal the number of protons.
- D.
Ionization occurs.
- 22.In a normal cellular protein, where would you expect to find a hydrophobic amino acid such as valine?
- A.
In the interior of the folded protein, away from water
- B.
Anywhere in the protein, with equal probability
- C.
In the transmembrane portion interacting with lipid fatty acid chains
- D.
In the interior of the folded protein, away from water, or in a transmembrane portion interacting with lipid fatty acid chains
- E.
On the exterior surface of the protein, interacting with water
- 23.Which of the following contain amino acids...
- A.
Enzymes
- B.
Cholesterol
- C.
Proteins
- D.
Antibodies
- E.
Insulin
- F.
Hemoglobin
- 24.A molecule with the formula C18H36O2 is probably a
- A.
Amino acid
- B.
Carbohydrate
- C.
Sugar
- D.
Fatty acid
- E.
Protein
- F.
Nucleic acid
- G.
Hydrocarbon
- 25.Which of the following statements is true for the class of biological molecules known as lipids?
- A.
They are insoluble in water.
- B.
They are soluble in water.
- C.
They contain nitrogen.
- D.
They are made of amino acids.
- E.
They are made from glycerol, fatty acids, and phosphate
- F.
They contain less energy than proteins and carbohydrates.
- G.
They are made by dehydration reactions
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