Transcript Chapter 2 Active Lecture Questions

Active Lecture
Questions
Chapter 2
Chemical
Principles
Copyright © 2010 Pearson Education, Inc.
Assume E. coli are grown in a nutrient medium
containing the radioisotope 16N. After a
48-hour incubation period, the 16N would most
likely be found in the E. coli’s
a.
b.
c.
d.
e.
carbohydrates.
lipids.
proteins.
water.
none of the above
If Pseudomonas bacteria are supplied with
radioactively labeled cytosine, after a 24-hour
incubation period this cytosine would most
likely be found in the cells’
a.
b.
c.
d.
e.
carbohydrates.
DNA.
lipids.
water.
proteins.
If E. coli were grown in a medium containing
the radioactive isotope 32P, the 32P would be
found in all of the following molecules of the
cell except
a.
b.
c.
d.
e.
ATP.
carbohydrates.
DNA.
plasma membrane.
none of the above.
A carbonated drink, pH 3, is ___________
times more acid than distilled water.
a.
b.
c.
d.
e.
4
10
100
1000
10,000
The best definition of ATP is that it is:
a.
b.
c.
d.
a molecule stored for food use.
a molecule that supplies energy to do work.
a molecule stored for an energy reserve.
a molecule used as a source of phosphate.
Which of the following is an organic
molecule?
a.
b.
c.
d.
e.
H2O (water)
O2 (oxygen)
C18H29SO3 (Styrofoam)
FeO (iron oxide)
F2C  CF2 (Teflon)
What is the smallest component of a pure
substance that exhibits physical and
chemical properties of that substance?
a.
b.
c.
d.
Nucleus
Molecule
Atom
Element
Atoms with different numbers of neutrons
in their nuclei are called
a.
b.
c.
d.
Molecules
Elements
Isotopes
Compounds
An isotope of oxygen has an atomic
number of 8 and an atomic weight of 18.
How many neutrons does it have?
a.
b.
c.
d.
18
7
8
10
Adenosine triphosphate is hydrolyzed to
become
a.
b.
c.
d.
ADP
AMP
cAMP
Inorganic phosphate
A bond formed from the attraction
between ions of opposite charge is called
a.
b.
c.
d.
An ionic bond
A covalent bond
A peptide bond
A hydrogen bond
What is formed by sharing electrons?
a.
b.
c.
d.
Compound
Ionic bond
Hydrogen bond
Covalent bond
Water has an unequal distribution of
charges and is called
a.
b.
c.
d.
An ionic molecule
A polar molecule
A covalent molecule
An organic molecule
Acidic solutions have
a.
b.
c.
d.
A pH of less than 7
A pH of greater than 7
A pH of 7
An equal number of hydrogen and hydroxide
ions
Which type of bond exists between
adjacent molecules of water?
a.
b.
c.
d.
Ionic bond
Covalent bond
Hydrogen bond
Peptide bond
Sucrose can be hydrolyzed into
a.
b.
c.
d.
Dextrans
Two glucoses
Glucose and galactose
Glucose and fructose
Enzymes are substances that speed up
biological reactions and are
a.
b.
c.
d.
Carbohydrates
Lipids
Proteins
Nucleic acids
In a decomposition reaction,
a. A larger molecule is broken down into its
component molecules, ions, or atoms
b. Two molecules are decomposed, and their
subunits are used to synthesize two new
molecules
c. The products can readily revert to form the
original reactants
d. Atoms, ions, or molecules are combined to
form a larger molecule
Which of the following are the “building
blocks” of proteins?
a.
b.
c.
d.
Amino acids
Fatty acids
Peptides
Nucleotides
Which of the following nitrogenous bases
is NOT found in an RNA molecule?
a.
b.
c.
d.
Adenine
Guanine
Thymine
Uracil
Glucose, sucrose, and cellulose are
examples of
a.
b.
c.
d.
Carbohydrates
Disaccharides
Polysaccharides
Polypeptides