Download CB Mini-Practice Test for Unit 1

BIOL 1013 - BIOLOGY OF THE CELL: MINI-PRACTICE TEST FOR UNIT I
Multiple Choice:
Choose the best answer. Be sure to look over all possible choices before making
your selection.
1.
The diversity of life has been divided by some biologists into different kingdoms. To which
kingdom do the algae belong?
A)
B)
C)
D)
Fungi
Protista
Animalia
Plantae
2.
In 1839, Schwann and Schleiden independently _____________________.
A)
B)
C)
D)
E)
coined the term “cell” to describe the smaller units that make up plant and animal tissues
proposed that all animals and plants consist of cells
proposed that cells arise from pre-existing cells
invented the light microscope
photographed a living cell during the process of cell division
3.
About twelve to twenty-four hours after the previous meal, a person's blood-sugar level normally
varies from 60 to 90 milligrams per 100 milliliters of blood, though it may rise to 130 mg/100 ml
after meals high in carbohydrates. That the blood-sugar level is maintained within a fairly narrow
range despite uneven intake of sugar is due the characteristic inherent to life called
____________________.
A)
B)
C)
D)
E)
adaptation
inheritance
metabolism
homeostasis
complex organization
4.
In microscopy, _________________ is the defined as the ability to separate two or more objects that
are close together and show them as distinct entities.
A)
B)
C)
D)
E)
magnification
contrast
amplification
resolution
dissection
5.
Unlike eukaryotic cells, prokaryotic cells ____________________.
A)
B)
C)
D)
E)
do not have a plasma or cell membrane
have chromosomes in their nucleus
do not have a nucleus
contain cellular organelles
All of the above are correct choices.
6.
Which of the following organelles is correctly matched with its function?
A)
B)
C)
D)
E)
nucleus: lipid synthesis
endoplasmic reticulum: heredity
Golgi bodies: packaging of cell products
mitochondria: photosynthesis
chloroplasts: storage of lipids
7.
If a cell did not have ribosomes, it would be unable to _______________________.
A)
B)
C)
D)
E)
extract energy from glucose
synthesize glucose
store food in the form of fat
form proteins
utilize energy from sunlight through process of photosynthesis
8.
The fine structure of the internal components of a cell can be detected through _______________.
A)
B)
C)
D)
the unaided human eye
light microscopy
scanning electron microscopy
transmission electron microscopy
9.
Isotopes are ____________________.
A)
B)
C)
D)
E)
combinations of two or more atoms
alternate forms of the same element that differ in the total number of protons found in the nucleus
alternate forms of the same element that differ in the total number of neutrons found in the nucleus
electrically charged
None of the above choices are correct.
10. Helium is composed of 2 electrons, 2 protons, and 2 neutrons. What is the atomic number of
helium?
A)
B)
C)
D)
2
3
4
6
11. Hydrophobic molecules are ___________ water.
A)
B)
C)
D)
attracted to
absorbed by
repelled by
mixed with
12. A hydrogen bond is ___________________.
A)
B)
C)
D)
a sharing of a pair of electrons between a hydrogen and an oxygen nucleus
a weak electrostatic attraction between a hydrogen atom and an oxygen or nitrogen atom
a sharing of a pair of electrons between a hydrogen nucleus and an oxygen nucleus
another name for an ionic bond
13. Which of the following is NOT true?
A)
B)
C)
D)
E)
Acids release hydrogen ions.
In a neutral solution, the amounts of hydrogen and hydroxide ions are almost equal.
A solution at a pH of 9 is acidic.
Weak acids, if placed on the tongue, are sour-tasting.
The pH scale is a measure of the concentration of hydrogen ions present in a solution.
14. A solution with a pH of 8 has how many times fewer hydrogen ions than a solution with a pH of 6?
A)
B)
C)
D)
E)
2
4
10
100
1,000
15. When two simple sugar molecules or monosaccharides are chemically joined together and water is
released, this is known as a _________________ reaction.
A)
B)
C)
D)
E)
hydrolysis
dehydration synthesis (condensation)
dynamic
bond-forming
nuclear
16. Which of the following is not considered to be a type of lipid?
A)
B)
C)
D)
E)
waxes
fats
phospholipids
steroids
All of the above choices are examples of lipids
17. What kinds of bond exist between two amino acids in a protein?
A)
B)
C)
D)
E)
peptide
ionic
hydrogen
covalent
Both A and D are correct choices.
18. Compounds that consist of carbon, hydrogen, and oxygen in a ratio of 1C:2H:1O are called
______________.
A)
B)
C)
D)
E)
lipids
enzymes
proteins
carbohydrates
nucleic acids
19. The following drawing shows the chemical formula for the sugar called sucrose. What type of
carbohydrate does this sugar represent?
Sucrose - For questions 19 & 20
A) monosaccharide
.
CH 2OH
B) disaccharide
C) polysaccharide
O
C
H H COH
D) cellulose
2
C OH
C
C
E) starch
H
H
O
H
H
H
HO
20. What molecule would be needed to break this
molecule of sucrose into two simpler forms of sugar
(i.e., glucose and fructose)?
A)
B)
C)
D)
E)
C
C
H
OH
O
C
C
OH
H
water
methane
carbon dioxide
oxygen (O2)
hydrogen (H2)
21. Nucleotides are the building blocks for _________________.
A)
B)
C)
D)
E)
proteins
steroids
lipids
ATP, NAD+, and DNA
carbohydrates
22. The figure at the lower right is a diagrammatic representation of a(n) _______________.
A)
B)
C)
D)
E)
nucleotide
amino acid
fatty acid
carbohydrate
None of the above choices are correct.
H
O
H 2N
C
C
OH
R
23. The interaction of four polypeptide chains in a hemoglobin molecule is _____________ structure.
A)
B)
C)
D)
quaternary
secondary
primary
tertiary
HO
C
CH 2OH
24. Each of the following lipids contain fatty acid chains as part of their chemical structure except for
_____________________________________.
A)
B)
C)
D)
E)
phospholipids
steroids
glycerides
fats
Both choice B and D are correct.
25. According to the First Law of Thermodynamics, _________________________.
A)
B)
C)
D)
E)
the total amount of free energy in the universe is on the decline
the total amount of energy in the universe is constant
the total amount of energy in the universe is constantly changing
entropy or increasing randomness and disorder are inevitable
nothing lasts forever
26. Each time free energy is transformed from one form to another or used to do work, some of it is
transformed into the energy of random motion or ________________.
A)
B)
C)
D)
E)
potential energy
kinetic energy
heat energy
activation energy
stored energy
27. Endergonic chemical reactions (where G > 0) __________________.
A)
B)
C)
D)
E)
occur spontaneously
do not occur spontaneously
require the input of free energy
can destroy some of the energy that exists in the universe
Both B and C are correct choices
28. A cell's capacity to acquire and use energy for building and breaking apart molecules is called
_________________________.
A)
B)
C)
D)
E)
photosynthesis
aerobic respiration
fermentation
reproduction
metabolism (anabolism & catabolism)
29. Model of enzyme action whereby a bound substrate initiates changes in the shape of the enzyme's
active site, resulting in a more precise fit between the enzyme and its substrate and is known as the
_______________________________.
A)
B)
C)
D)
E)
lock and key model
induced-fit model
induced key model
lock and fit model
Florida keys model
30. A substance that attaches to the active site of an enzyme and prevents the substrate from binding to
the enzyme is called a ______________________.
A)
B)
C)
D)
E)
competitive inhibitor
non-competitive inhibitor
catalyst
coenzyme
proton acceptor