Download General Biology Old Exam #1

Biology 1 Exam #1 Fall 2014
____________________________________
Student Name
Lab Session
Welcome to the first exam, worth 80 points. Please read and follow all directions carefully. You
may have only your exam, scantron, and writing utensil on your desk during the exam. You
cannot possess or use any other materials nor may you communicate via any means with anyone
else during the exam. The use/possession of any other materials or communication with anyone
other than the instructor will be considered cheating and will result in failing the course.
Good luck!
I. Multiple choice; True/False; Matching. Choose the one correct answer for each of
questions 1 through 20 and fill in your choice on your scantron sheet. (2 points each)
1) Which of the following answer lists chemical bonds in the order of weakest to strongest?
A) covalent bond, ionic bond, hydrogen bond
B) ionic bond, covalent bond, hydrogen bond
C) hydrogen bond, ionic bond, covalent bond
D) hydrogen bond, covalent bond, ionic bond
2) Which monomer IS NOT correctly paired with its polymer?
A) monosaccharide: polysaccharide
B) amino acid: DNA
C) amino acid: protein
D) nucleotide: RNA
3) The smallest unit of biological structure that meets the functional requirements of “living” is
the ________.
A) organ
B) organelle
C) cell
D) macromolecule
4) Which of the following sequences represents the hierarchy of biological organization from the
least complex to the most complex level?
A) organelle, tissue, biosphere, ecosystem, population
B) organism, organ, tissue, organelle, molecule
C) organism, community, biosphere, molecule, tissue, organ
D) organism, population, community, ecosystem, biosphere
5) Enzymes are catalysts in biochemical reactions. Enzymes can function to
A) break molecular bonds
B) rearrange molecular bonds
C) form new molecular bonds
D) all of the above
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6) The type of logical thinking that uses related observations to arrive at a general conclusion is
called ________.
A) deductive reasoning
B) the scientific method
C) inductive reasoning
D) hypothesis-based science
7) Which of the following statements is not true?
A) Water is polar.
B) Water stabilizes temperature.
C) Water is essential for life.
D) Water is the most abundant atom in Earth’s atmosphere.
8) The pH of lemon juice is about 2.0, whereas tomato juice's pH is about 4.0. Approximately
how much of an increase in hydrogen ion concentration is there between tomato juice and lemon
juice?
A) 2 times
B) 20 times
C) 10 times
D) 100 times
# of pairs of ground nesting
birds in one season
120
100
80
60
40
20
0
0
2
4
6
8
10
Field habitat (The percentage of land covered with bushes on a
farmed field.)
Use the above graph to answer question #9
9) Which statement correctly describes the relationship between the 2 variables presented in the
above graph?
A) The amount of field habitat affects the number of pairs of ground nesting birds in one
season.
B) The number of pairs of ground nesting birds affects the amount of field habitat in one
season.
C) The amount of field habitat is presumed to affect the number of pairs of ground
nesting birds in one season.
D) The number of pairs of ground nesting birds is presumed to affect the amount of field
habitat in one season.
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10) Phospholipids are important components of __________.
A) the plasma membrane of cells
B) the ring structure of steroids
C) the waxy covering on leaves
D) the double bond in hydrocarbon chains
11) The 2 regions of a phospholipid are the hydrophobic fatty acid chain and the hydrophilic
phosphate group.
A) True
B) False
12) The tertiary structure of a protein molecule is
A) the sequence of a chain of amino acids
B) the folding pattern of one protein molecule due to side chain interactions
C) the alpha helix
D) the interaction of several polypeptide chains
13) The 3 components of a nucleotide are a phosphate group, a pentose sugar, and a nitrogenous
base.
A) True
B) False
14) Which is true for an unsaturated fatty acid?
A) The hydrocarbon chain contains a double bond.
B) It is solid at room temperature.
C) The number of hydrogen atoms attached to the carbon skeleton is maximized.
15) The four major groups of organic compounds are
A) carbohydrates, lipids, proteins, and nucleic acids
B) fats, waxes, carbohydrates, and amino acids
C) lipids, fats, waxes, and steroids
D) carbohydrates, proteins, amino acids, and nucleic acids
16) What are the two most fundamental cell types?
A) prokaryotes and eukaryotes
B) animals and bacteria
C) bacteria and archaea
D) plants and animals
17) A protein may become denatured due to
A) change in temperature
B) change in pH
C) exposure to chemicals
D) all of the above
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Matching. For questions 18, 19, and 20 match the functional group on the left to their identities
on the right. Each choice will be used only one.
H
18) R – N
H
O
O
A) phosphate
B) carboxyl
19) R – C – OH
C) amino
O
20) R – O – P – OH
OH
II Definitions. Please define each term in one sentence or less (4 points each)
1. hypothesis
2. theory
3. dehydration synthesis
4. atomic number
5. buffer
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III. Short Answer.
1) For question 1, fill in the 5 blanks of the protein chart. (10 Points)
Protein
What is the basic unit of a protein?
Amino acid (a monomer)
What are the parts of an amino acid?
central carbon
What functional groups are bonded to the central carbon?
R group
amino group carboxyl group hydrogen atom
What does the R group determine?
__________________
What bond joins amino acids?
__________________bond
What type of reaction forms these
bonds?
__________________Reaction
What is the name of a chain of
amino acids?
__________________
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2) The hydrogen bond plays a very important role in biology. List 3 types of molecules that are
held together with hydrogen bonds. (5 points)
3) Draw in the electrons of this stable carbon atom. A stable carbon has 6 protons and 6
neutrons. Be sure to place the electrons in their correct shells. (5 points)
Outer shell
Inner shell
6 protons
6 neutrons
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