BIOL 1020: Principles of Biology
1.
2.
Exam I
Which of the following is NOT usually found in a phospholipid:
A. Fatty acid
B. Glycerol
C. Phosphate
Select the incorrect association.
A. Hydroxyl - alcohol
C. Carboxyl - acid
D. Sugar
B. Carbonyl - aldehyde
D. Phosphate - thiol
3.
Two substances with the same molecular formulas, but different structural formulas, are called:
A. Inbred
B. Isotopes
C. Isomers
D. Isotonic
4.
Which of the following is NOT a characteristic of water?
A. It is polar, and an excellent solvent
B. It is adhesive, and tends to stick to other things
C. It is non-polar, and an excellent solvent D. It is cohesive, and tends to stick to other water
5.
A hypothesis is a(n)_______________.
A. Proposed explanation
B. Observation
C. Conclusion
D. Result
6.
Which of the following is NOT correct about amino acids?
A. Amino acids contain asymmetric carbon atoms.
B. Amino acids contain an amino group and a carboxyl group fastened to an asymmetric carbon.
C. Amino acids can make peptide bonds.
D. There are over 30 kinds of individual amino acids found in the lipids of a cell.
7.
α-helix or β-sheets structures of polypeptides best describe ______ level of protein structure?
A. Primary
B. Secondary
C. Tertiary
D. Quaternary
8.
Carbon:
A. Has 4 electrons in its outermost shell so it forms 4 chemical bonds.
B. Prefers to give up 3 electrons to form ions.
C. Has 2 electrons in its outer shell so it forms 2 chemical bonds.
D. Is never found in inorganic molecules but always found in organic molecules.
9.
Saturated fatty acids contain the maximum number of _____________atoms per molecule.
A. Phosphorus
B. Hydrogen
C. Nitrogen
D. Oxygen
10.
Statement A. The molecular mass of a molecule can be obtained by adding the atomic masses of all
of the atoms contained in the molecule.
Statement B. One mole of any substance always contains Avogadro's number of units.
A. Only statement A is true. C. Both statements A and B are true.
B. Only statement B is true.
D. Neither statement A nor statement B is true.
11.
Acids:
A. Are proton acceptors.
B. Have pH's below 7.
C. Do not form salts when mixed with bases, but form water instead.
D. Are hydrocarbons with hydrogen bonded to carbon.
12.
All nucleic acids:
A. Are polymers of nucleotide monomers organized in a double stranded molecule.
B. Are polymers containing deoxyribose, and carry the genetic information of the cell.
C. Are made of monomers which contain a 5-carbon sugar, a phosphate group, and a
nitrogenous base of either the purine or pyrimidine type.
D. Are polymers of nucleotide monomers organized in a three stranded molecule.
13.
Phospholipids:
A. Are important components of biological membranes because they are hydrophilic.
B. Are monoacyl glycerides with 2 phosphates attached to the glycerol molecule.
C. Have both hydrophilic and hydrophobic regions that forms bilayer in aqueous solution.
D. Usually contain amphophilic domains, hydrophobic domains, and water.
14.
Functional hemoglobin has four polypeptides (2 α and 2 β subunits). Hemoglobin with these
four subunits best describe its ______ structure:
A. Primary
B. Secondary
C. Tertiary
D. Quaternary
15.
An atom has six protons and eight neutrons. Its atomic number is
A. Two
B. Six
C. Eight
Fourteen
16.
17.
18.
Buffers
A. Make solutions acidic
C. Minimize pH changes
B. Make solutions basic
D. Have no effect on pH
Which type of chemical bond results from electron sharing?
A. Hydrogen
B. Ionic
C. Covalent
Each is a property of water except
A. Exhibits cohesive forces
C. Helps to resist temperature change
D.
D. Hydrophobic
B. Exhibits adhesive forces
D. Maximum density is at 0 degrees Celsius
19.
Amino acids are fastened together by _______ to form protein.
A. Phosphodiester bonds
B. Glycosidic bonds
C. Peptide bonds
20.
Nucleic acids are polymers of nucleotides fastened by ___________.
A. Peptide bonds
B. Glycosidic bonds
C. Phosphodiester bonds
21.
Atoms with similar atomic number but different atomic mass are:
A. Isotopes
B. Isomers
C. Have different positions in periodic table
22.
Chemically pure water has:
A. 0.00001 moles of H+/liter of water
C. Both A and B.
B. 0.000000001 moles of OH-/liter of water
D. None of the above
23.
A solution has H+ ion concentration of 0.0001 moles/liter. This solution is:
A. Acidic
B. Basic
C. Neutral
D. None of the above
24.
Amino acids have:
A. Carboxyl group
25.
B. Amino group
C. Both A and B.
A fatty acid with ___________ is unsaturated fatty acids:
A. Double carbon bond(s) in hydrocarbon chain
B. Single carbon
hydrocarbon chain
C. Double hydrogen bond
D. None of the above
D. none
bonds
in
26.
Which of the following is NOT true about a good scientific hypothesis ?
A. Explains existing observations
B. Predicts outcome of certain experiment
C. It can not be tested by experiment
D. It can be tested by scientific experiment
27.
Which of the following is NOT true about living matter?
A. Made up of cells
B. Can reproduce
C. Can grow and develop
D. Can not carry out metabolic process
28.
During a hydrolysis reaction, _________ is associated with ________ of a water molecule.
A. Synthesis / formation
B. Breakdown / formation
C. Synthesis / use
D. Breakdown / use
29.
A molecule of glycerol bonding to two molecules of fatty acids is_________.
A. Phospholipid
B. Diacylglycerol
C. Monoacylglycerol D. None
30.
In a chemical reaction, oxidation is the ___________:
A. Loss of electrons
B. Loss of water
C. Gain of electron
D. Gain of water
31.
Two molecules of glucose are linked together by a ________ bond and makes_________.
A. peptide bond / sucrose
B. glycosidic bond / sucrose
C. glycosidic bond / maltose
D. ester bond / maltose
32.
Ionic bonds are made because
A. Cations & anions have different electronegativity
C. Anions loose electron
33.
34.
Glucose and fructose are__________
A. Optical-/ stereoisomer
B. Geometric isomers
B. Cations gain electron
D. None of the above
C. Structural isomers
Proteins are made from_____________
A. 30 different L-amino acids
B. 20 different D-amino acids
C. 20 different L-amino acids
D. none of the above
35.
What is NOT correct about cAMP?
A. Is an amino acid
B. Is a regulatory molecule
C. Is a nucleotide
D. Phosphate is attached to both 3’ 5’ C of ribose
36.
What is NOT correct about ATP?
A. Is an energy–rich molecule
C Has a purine and a ribose sugar
B. Has a pyrimidine and a ribose sugar
D. Has three phosphates
37.
Phospholipids make bilayer in water because it is (a)____________
A. Hydrophobic molecule
B. Hydrophilic molecule
C. Part hydrophilic & part hydrophobic
D. None of the above
38.
Which of the following is not a part of an ATP molecule?
A. A purine base called adenine
B. 3 phosphate groups
C. A ribose sugar
D. A deoxyribose sugar
39.
Isoptopes differs with respect to the number of __________.
A. Protons
B. Electrons
C. Neutrons
40.
D. None
In a polar covalent bond:
A. Unequal sharing of electrons leads to distinct areas of positive and negative charge in the
molecule.
B. Electrons are actually donated from one atom to another
C. Transient attractions cause hydrophobic interactions
D. More energy is used to make the bond, so there is more reduction
41.
Select correct match for questions 41-43 from A-C
Electron
A. Positive charge
42.
Neutron
B. Negative charge
43.
Proton
C. One mass unit (Dalton)+ no charge
44.
Following are the organic compounds, except_______.
A. Glucose
B. Phospholipid
C. Water
D. Amino acid
45.
Condensation reaction involving a glycerol and 2 fatty acid molecules yield_______ and ______.
A. 1 Phospholipid / 2 phosphate
B. 1 Diacylglycerol / 2 water
C. 2 Monoacylglycerol / 2 water
D. 2 Monoacylglycerol / 1 water
46.
Catabolic process involves_____________
A. building of complex molecules from simple molecules
C. breakdown of large molecules into simple molecules
B. energy expenditure
D. non of the above
47.
Parts of the enzyme that interacts with substrate is called_________
A. cofactor
B. active site
C. competitor
D. apoenzyme
48
Which of the following is not true about enzymes?
A. lowers activation energy
B. do not change the equilibrium of reaction
C. are catalyst that can be reused
D. properties are permanently changed as it
catalyzes a reaction
49.
Cells do not regulate rate of metabolism by:
A. control of intracellular amounts of enzyme
C. heat inactivation of enzyme
B. feed back inhibition of enzyme
D. binding of allosteric molecule to enzyme
50.
Transfer of electrons from one molecule to another is equivalent to _________ transfer.
A. heat
B. oxygen
C. carbon
D. energy
51.
Starch and cellulose
A. are polymers of glucose and amino acids, respectively
B. are polymers of fatty acids and glucose, respectively
C. are both polymers of different isomeric forms of glucose
D. are both polymers of -glucose
E. are both polymers of -glucose
52.
Hydrolysis of ATP is _____ reaction.
A. endergonic
B. exergonic
C. entropy
D. enthalpy
53.
Energy stored in ATP molecules is in the form of __________ energy.
A. heat
B. potential
C. kinetic
D. nuclear
54.
Peptide bonds are important the level of ___________ structure of proteins.
A. primary
B. secondary
C. tertiary
D. quaternary
55.
Glycogen is a ___________ polymer of _______ glucose.
A. unbranched / beta
B. unbranched / alpha
C. branched / beta
D. branched / alpha