Intro to Biology
It refers to the steady state physiological condition of the body allowing an organism to maintain stable internal conditions.
Homeostasis.
It pertains to an atom or molecule that has a charge.
Ion
You find a bacterium growing in pure oil, containing the usual hydrophobic lipids. This organism must be very good at breaking down _____.
a) polar covalent bonds
b) hydrogen bonds
c) ionic bonds
d) nonpolar covalent bonds
e) all of the above
d) nonpolar covalent bonds
Which of the following does not describe an acid?
a. It will increase the hydrogen ion concentration of a solution.
b. It will increase the pH of the solution.
c. It will decrease the hydroxide ion concentration of a solution.
d. It is a hydrogen ion donor.
b. It will increase the pH of the solution.
What type of chemical bond joins a functional group to the carbon skeleton of a large molecule?
a) covalent bond
b) hydrogen bond
c) ionic bond
d) Van der Waals interactions
a) covalent bond
Which of the following is not domain?
a. archaea
b. bacteria
c. eukarya
d. protista
d. protista
Which of the following determines the ability of an atom to form chemical bonds?
a) protons
b) neutrons
c) electrons
d) all of the above
c) electrons
Lithium (Li) has one valence electron and Chloride (Cl) has seven valence electrons. An ionic bond is formed and the atoms become ions. Which atom would be the cation? Which atom would be the anion?
a. Cation Cl, Anion Li
b. Cation Cl, Anion Cl
c. Cation Li, Anion Li
d. Cation Li, Anion Cl
d. Cation Li, Anion Cl
Water shows high cohesion and surface tension and can absorb large amounts of heat because of large numbers of which type of bonds between water molecules?
a) strong ionic bonds
b) nonpolar covalent bonds
c) polar covalent bonds
d) hydrogen bonds
e) weak ionic interactions
d) hydrogen bonds
Which functional group behaves as a base in organic molecules?
a) amino
b) carboxyl
c) carbonyl
d) sulfhydryl
e) hydroxyl
a) amino
Which property is shared by living things but not with a rock?
a) reproduction
b) evolutionary adaptation
c) energy processing
d) homeostasis
e) all of the above
e) all of the above
Titanium has an atomic number of 22. How many protons, neutrons, and electrons are in an isotope of titanium with mass number of 48?
a)p = 22, n = 26, e = 22
b)p = 11, n = 26, e = 11
c)p = 11, n = 11, e = 70
d)p = 11, n = 22, e = 48
e)p = 22, n = 22, e = 48
a)p = 22, n = 26, e = 22
Ammonia (NH3) has polarity which allows it to form hydrogen bonds. In an ammonia molecule,
a. N is partially positive, H is partially positive.
b. N is partially positive, H is partially negative
c. N is partially negative, H is partially positive
d. N is partially negative. H is partially negative
c. N is partially negative, H is partially positive
If you were a spider gliding across a pond in the summer in Virginia, for what property of water would you be most grateful?
a) high heat of fusion
b) high specific heat
c) cohesion
d) adhesion
c) cohesion
If you were a spider gliding across a pond in the summer in Virginia, for what property of water would you be most grateful?
a) high heat of vaporization
b) high specific heat
c) cohesion
d) adhesion
c) cohesion
Which correctly orders the levels of biological organization from smallest to largest?
a) cells, organelles, organ system, atoms, organism
b) molecules, organism, population, atoms, tissues
c) atoms, molecules, cells, tissues, organism
d) atoms, cells, organelles, tissues, organism
e) cells, organs, population, ecosystems, communities
c) atoms, molecules, cells, tissues, organism
An atom of oxygen has an atomic number of 8. How many electrons are in the first, second, and third electron shells, respectively?
a) 2, 3, 3
b) 2, 6, 0
c) 8, 0, 0
d) 0, 4, 4
e) none of the above
b) 2, 6, 0
A water molecule is held together by ____ bonds. Two water molecules are held together by _____ bonds.
a. polar covalent; polar covalent
b. polar covalent; nonpolar covalent
c. polar covalent; hydrogen
d. hydrogen; polar covalent
e. hydrogen; nonpolar covalent
c. polar covalent; hydrogen
Compared to an acidic solution at pH 5, a basic solution at pH 8 has _____.
a) 1,000 times more hydrogen ions
b) 1,000 times fewer hydrogen ions
c) 100 times fewer hydrogen ions
d) the same number of hydrogen ions but more hydroxide ions
e) 100 times fewer hydroxide ions
b) 1,000 times fewer hydrogen ions
Which of the following explains how a pool of water can crack a boulder sitting in it during freezing weather?
a) corrosion of the minerals in the boulder
b) expansion of the water as it freezes
c) adhesion of the water in the minerals in the boulder
d) all of the above
d) none of the above
b) expansion of the water as it freezes
A water sample taken from a hot spring contained a single-celled organism. It has a cell wall but not have a nucleus. It most likely belongs to which domain?
a. Archaea
b. Bacteria
c. Protist
d. Eukarya
a. Archaea
What do elements with atomic numbers 6, 14, and 32 have in common?
a) same number of electrons
b) same atomic mass
c) same number of valence electrons and will form the same number of covalent bonds
d) all of the above
e) none of the above
c) same number of valence electrons and will form the same number of covalent bonds
If a covalent bond between 2 atoms is non-polar, that means the atoms have:
a) the same number of electrons
b) similar atomic weights
c) similar electronegativities
d) different heat capacities
e) different electronegativities
c) similar electronegativities
Water has an unusually high specific heat. What does this mean?
a) At its boiling point, water changes from liquid to vapor.
b) A large amount of heat is required to raise the temperature of water.
c) Ice floats in liquid water.
d) Saltwater freezes at a lower temperature than pure water.
e) Floating ice can insulate bodies of water.
b) A large amount of heat is required to raise the temperature of water.
If you were a fish in a pond in the winter in Minnesota, for what property of water would you be most grateful?
a) high heat of vaporization
b) high specific heat
c) cohesion
d) adhesion
e) hydrogen bonding
e) hydrogen bonding