Intro to Biology
Which property of life results from natural selection and increases an organism's fitness in a particular environment?
a. Respond to stimuli
b. energy processing
c. sexual reproduction
d. adaptation
d. adaptation
Which of the following directly determines the bonds that an atom can form?
a) protons
b) neutrons
c) electrons
c) electrons
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.
It refers to the steady state physiological condition of the body allowing an organism to maintain stable internal conditions.
Homeostasis.
Which correctly orders the levels of biological organization from smallest to largest?
a) cells, organelles, organ system, community, ecosystems
b) molecules, organism, population, communities, biosphere
c) molecules, cells, tissues, ecosystems, communities
d) organelles, cells, population, biosphere, ecosystems
e) cells, organs, population, ecosystems, communities
b) molecules, organism, population, communities, biosphere
It pertains to an atom or molecule that has a charge.
Ion
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
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
All of the gray squirrels that inhabit an oak forest is an example of a(n) _____.
a) ecosystem
b) biosphere
c) community
d) population
d) population
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
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 melting points
E) Different electronegativities
C) Similar electronegativities
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
Which functional group behaves as a base in organic molecules?
a) amino
b) carboxyl
c) carbonyl
d) sulfhydryl
e) hydroxyl
a) amino
An experimental study is conducted to determine whether a new drug reduces high blood pressure. The change in systolic and diastolic blood pressure values of the participants represents the _____.
a) independent variable
b) dependent variable
c) hypothesis
d) theory
e) control group
b) dependent variable
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
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
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
As the conc. of hydrogen ions increases, the pH _____. As the conc. of hydroxide ions decreases, the pH ______.
a. decreases; decreases
b. increases; decreases
c. decreases; increases
d. increases; increases
a. decreases; decreases
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
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
What is the concentration of hydroxide ions in a solution where pH = 10?
-log 10-4
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.