Name: ___________________________________
Circle the Lab Section you are enrolled in (Monday or Tuesday or Thursday)
Bio 105 Midterm 1;
All questions are worth 2 points unless marked otherwise. Total points are 125
Answer questions 1 - 19 using the scantron:
1.
Researchers are trying to determine if a new food preservative causes stomach
cancer. To test the safety, they feed the food preservative to half of the mice and look for signs
of stomach cancer in all the mice. In this example, the controls are:
A.
B.
C.
D.
2.
The mice fed a normal diet
Signs of stomach cancer
The addition of the food preservative to half the mice
The fact that all the mice are housed in the same place, with the same water, light, and
cages.
Groups of all the species living together in the same area are called a(n) ________.
A.
B.
C.
D.
3.
Community
Population
Ecosystem
Biosphere
Which of the following types of organisms are not composed of eukaryotic cells?
A.
B.
C.
D.
E.
4.
Fungi
Bacteria
Plants
Animals
Protists
A neutral (no charge) atom must contain:
A.
B.
C.
D.
an equal number of protons and neutrons.
an equal number of protons, neutrons, and electrons.
an equal number of protons and electrons.
an equal number of neutrons and electrons.
5.
The following molecule is:
H
H
N
CH3
A. non-polar
B. polar
6.
What is the difference between covalent and ionic bonds?
A. Covalent bonds are the sharing of electrons, whereas ionic bonds are the sharing of
protons.
B. Covalent bonds involve the attraction between slightly charged molecules, whereas ionic
bonds involve the attraction between two fully charged ions.
C. Covalent bonds involve the sharing of neutrons, whereas ionic bonds involve the
attraction of slightly charged atoms.
D. Covalent bonds are the sharing of electrons, whereas ionic bonds involve the transfer of
electrons from one atom to another.
7.
A solution with a pH of 4 has a _______ H+ concentration then a solution with a pH of 5.
A.
B.
C.
D.
8.
10 times higher
10 times lower
100 times higher
100 times lower
What are the three most common elements in the human body?
A.
B.
C.
D.
E.
9.
Sulfur, nitrogen and oxygen
Carbon, nitrogen and hydrogen
Carbon, oxygen and hydrogen
Sulfur, oxygen and hydrogen
Sodium, chloride and hydrogen
Enzymes are
A.
B.
C.
D.
proteins
are usually specific for their substrates
are not consumed in the process
all of the above
10.
Power plants are one of the main sources of pollution that cause acid precipitation, what
chemical is released from power plants that causes acid precipitation:
A.
B.
C.
D.
E.
Mercury
CO2
H2SO4
HNO3
CH4 (Methane)
11.
A substance designed to maintain a stable pH of a solution within a cell or a biological
system would be which of the following be which of the following?
A. Buffer
B. Catalyst
C. Acids
D. Neutral
12.
A.
B.
C.
D.
E.
Salt is added into water, in this example, salt would be the _____.
Acid
Solvent
Solute
Catalyst
Buffer
13.
You have information about an atom that contains 5 protons, 6 neutrons, and 5 electrons.
Which of the following statements would be true?
A. It will have an atomic weight of 16.
B. It will be an ion.
C. It will have 5 electrons in its outermost shell.
D. It will have an atomic number of 6
E. It will have an atomic weight of 11.
14.
A.
B.
C.
D.
E.
Plants use this complex carbohydrate for energy storage:
glycogen
starch
hexose
cellulose
None of the choices are correct.
15.
What type of biological molecule is shown below:
O
H2N
CH
C
OH
R
A.
B.
C.
D.
E.
16.
Steroid
Protein
Monosaccharide
Cholesterol.
Amino Acid
The fatty acid pictured below is:
A.
B.
C.
D.
E.
17.
A.
B.
C.
D.
E.
Unsaturated
Saturated
Polyunsaturated
Trans
None of the above
What type of biological molecule is shown below:
Steroid
Triglyceride
Monosaccharide
Fatty acid
Amino acid
18.
A.
B.
C.
D.
E.
19.
A.
B.
C.
D.
E.
What type of biological molecule is shown below:
Steroid
Triglyceride
Phospholipid
Nucleotide
Amino acid
What type of biological molecule is shown below:
Steroid
Nucleotide
Nucleic acid
Phospholipid
Amino acid
Answer the following questions on the separate answer sheet provided.
20.
An experiment where neither the researchers nor participants know which group is
receiving the treatment is called a ________.
21.
________ is the ability to maintain a relatively constant internal environment.
22.
The ________ is a measure of the pull one atom has on a shared electron.
23.
To ________ is to make something (like a blood vessel) wider or larger.
24.
A(n) ________ is a substance that appears to be identical to a drug being tested but has
no known effect on the condition being studied.
25.
A(n) ________ is a substance that accepts hydrogen ions when it is in a solution.
26.
The site where a substrate binds to an enzyme is called the ______.
27.
A(n) ________ is a large molecule consisting of many monomer subunits bonded
together.
28.
Which biological molecule is the backbone of the cell membrane?
29.
Weak bonds that function to stabilize water and nucleic acids such as DNA are _______
bonds.
30.
________ refers to the structure of a protein in which two or more polypeptide chains
bind together to form a functional protein.
31.
What is the function of enzymes?
32.
A polysaccharide that is made by plants but can’t be digested by humans is ________.
33.
__________ is the process that causes a three-dimensional protein to lose its shape,
resulting in the loss of biological function
34.
The organelle that stores starch is the ________
35.
What lipid is used for energy storage?
36.
What biological molecule functions to signal between cell and controls metabolic
processes and cellular functions?
37.
The monomer units of a protein are ___A_____ and they are bound by a type of a
covalent bond called a _____B_____ bond
38.
H
What is wrong with this molecule?
H
H
O
C
C
C
H
H
H
H
39.
(3 pts) What are the two motifs or features commonly found in proteins that make up the
secondary structure of proteins, and how are these features stabilized?
40.
(4 pts) Answer the following questions regarding classification:
A. What kingdom do humans belong in?
B. What domain do humans belong in?
41.
(4 pts) You work for a pharmaceutical company who has developed a new drug to treat
asthma in people. What are the four stages of clinical testing your drug needs to go through
before it is approved by the FDA? Name the four stages and briefly describe what each stage
determines.
42.
(4 pts) You are asked to determine if a substance is alive. Describe four characteristics
you would look for to determine if this substance is a living organism? (Use complete sentences)
43.
(4 pts) Using the periodic table, answer the following questions regarding the element,
nitrogen.
A.
B.
C.
D.
44.
How many electrons are in each shell?
How many bonds can this atom form?
How many protons does this atom have?
How many neutrons does this atom have?
Draw two water molecules and show the hydrogen bonding between the water molecules
45.
(4 pts) What are two structural similarities and two structural differences between a
phospholipid and a triglyceride?
46.
(4 pts) How are radioisotopes similar and how are they different from regular isotopes?
47.
(4 pts) A friend of yours asks you what are “trans fats” what would you tell them?
Include in your answer the structure of trans fats, the source of trans fats, and how eating trans
fats affects your health and how can you tell from the label if a product has trans fat.
48.
(8 pts) What are the four properties of water and describe in detail why these properties
make water essential for life.
49.
(8 pts) You are a researcher working at the National Institute for Health. You have been
trained to conduct scientific research using the scientific method. Describe the eight steps of the
scientific method that you will follow. (Use complete sentences to fully describe each step.)
Bonus Questions
1. What is the name of the woman who won a noble prize (one of two noble prizes she was
awarded) for her work on radioactivity. Hint she named the term radioactivity.
2. In biology what does the word organic refer to?
3. When two molecules are split apart and water is added, the reaction is called _______.
4. Studies that look for patterns that occur in populations are called______ (For example,
looking at smoking and lung cancer rates in a human population over time)
5. Which domain contains organisms that are one celled and that lack a nucleus and live in
extreme environments