Quarter 2 Mastery Packet
Name: __________________
*** This is a practice test only and is not all inclusive of all material that will be on the final exam. Do not rely soley on this
mastery packet for your review, because it doesn't include everything that may potentially be tested. These questions are
related to second quarter material only. Use your first quarter mastery packet as review of first quarter material.
1) In a DNA double helix, adenine pairs with ______ and guanine pairs with ______.
A) guanine . . . adenine
B) cytosine . . . uracil
C) uracil . . . cytosine
D) thymine . . . cytosine
E) cytosine . . . thymine
2) The percent of cytosine in a double stranded DNA is 17. What is the percent of adenine in that DNA?
A) 17
B) 66
C) 33
D) 34
3) The two strands of a DNA molecule run in opposite directions. The 3' and 5' ends of one strand are opposite the 5'
and 3' ends of the complementary strand. This is analogous to
A) a baseball and a bat.
B) a photograph and a photographic negative.
C) an "up" escalator next to a "down" escalator.
D) one side of a divided highway.
E) both A and C.
4) In order to fit within a cell, DNA becomes more compact by
A) being enzymatically changed into a protein.
C) wrapping tightly around associated proteins.
B) extending to form very long, thin molecules.
D) breaking apart into separate genes.
5) Which of the following is characteristic of a DNA double helix?
A) The amount of adenine is equal to the amount of thymine, and the amount of guanine is equal to the amount
of uracil.
B) The amount of adenine is equal to the amount of cytosine, and the amount of guanine is equal to the amount
of thymine.
C) The amount of adenine is equal to the amount of guanine, and the amount of thymine is equal to the amount
of cytosine.
D) The amount of adenine is equal to the amount of uracil, and the amount of guanine is equal to the amount of
cytosine.
E) The amount of adenine is equal to the amount of thymine, and the amount of guanine is equal to the amount
of cytosine.
6) Which of the following are nitrogen bases of the purine type?
A) guanine and adenine
B) adenine and thyamine
C) cytosine and guanine
D) uridine and cytosine
E) thyamine and uridine
7) Which of the following descriptions best fits the class of molecules known as nucleotides?
A) a nitrogen base, a phosphate group, and a five-carbon sugar
B) a five-carbon sugar and a purine or pyrimidine
C) a nitrogen base and a five-carbon sugar
D) a five-carbon sugar and adenine or uracil
E) a nitrogen base and a phosphate group
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8) The statement that “DNA replication is semi-conservative” means that
A) The two stands of the double helix have identical base sequences
B) Only one strand of DNA is copied
C) First one strand is copied, and then the other strand is copied
D) Each double helix consists of one old and one new DNA strand
9) Why must the lagging strand of DNA be replicated in short pieces?
A) the DNA polymerase can synthesize in only one direction
B) to make proofreading for errors easier
C) otherwise the helix will become distorted
D) because of limited space
10) Which enzymes catalyze the elongation of a DNA strand in the 5'
A) DNA polymerase I
B) DNA polymerase III
C) DNA ligase
D) helicase
E) primase
3' direction?
11) The problem of replicating the lagging strand of DNA that is, adding bases in the 3'
of the following?
A) RNA primers
B) DNA ligase
C) Okazaki fragments
D) A and B only
E) A, B, and C
5' direction requires which
12) In DNA replication the fragments of newly synthesized DNA are joined together, so that the 5' end of one fragment
is joined to the 3' end of another fragment by the action of
A) DNA polymerase
B) DNA ligase
C) RNA primer
D) DNA endonucleases
13) What type of chemical bond joins the bases of complementary DNA strands?
A) ionic
B) hydrophilic
C) hydrogen
D) covalent
E) hydrophobic
14) Restriction enzymes are obtained from ______.
A) bacteria
B) retroviruses
E) eukaryotes
C) archaea
D) DNA viruses
15) "Sticky ends" are ______.
A) the site on chromosomes where the centromere is found
B) telomeres
C) the only regions of chromosomes where homeotic genes are found
D) regions of double-stranded DNA that can be cut by a restriction enzyme
E) single-stranded ends of fragments of double-stranded DNA
16) You are attempting to link an individual to a crime. The only evidence you have is a tiny drop of blood. How can
you use this drop of blood to make the association?
A) You can use the sample to determine the individual's ABO blood group.
B) You can use the sample to check for the presence of the Rhesus factor.
C) You can use gel electrophoresis to determine the length of the DNA found in the sample.
D) You can use PCR to increase the amount of DNA available for restriction fragment analysis.
E) There is insufficient material to identify the criminal.
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17) To make restriction fragments, the DNA sample is treated with ______.
A) DNA polymerase
B) DNA ligase
C) gel electrophoresis
D) PCR
E) restriction enzymes
18) Gel electrophoresis separates DNA fragments on the basis of differences in their ______.
A) electric charge and length
B) G:T ratio
C) pH
D) degree of hydration
E) A:C ratio
19) The Human Genome Project has the potential to ______.
A) lead to treatments for inherited diseases
B) aid in solving crimes
C) lead to treatments for contagious diseases
D) increase our understanding of the historical relationships among species
E) play a role in all of the choices listed here
20) ______ is a hydroxyl group.
A) —H
B) —NH2
COOH
D) —SH
E) —OH
C) fructose
D) maltose
E) lactose
24) Which of the following is an example of a polysaccharide?
A) fructose
B) starch
C) sucrose
D) glucose
E) maltose
C)
21) What name is given to the following reaction?
sucrose + water
glucose + fructose
A) denaturation
B) glucogenesis
C) dehydration reaction
D) hydrolysis
E) anabolism
22) Carbohydrates typically have ______.
A) a hydrocarbon chain
B) an NH2 group
C) a PO4 group
D) C, H, and O in a 1:2:1 ratio
E) a 5-carbon ring
23) Table sugar is ______.
A) sucrose
B) glucose
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The DNA profiles below represent four different individuals.
25) Which of the following statements is most likely true?
A) A is the child of C and D.
B) D is the child of B and C.
C) D is the child of A and B.
D) D is the child of A and C.
E) B is the child of A and C.
26) The range of the correlation coefficient is:
A) -1 to 1
B) -1 to 0
C) 0 to 1
27) Which of the following indicated a strong positive correlation?
A) r = 0
B) r = -0.79
C) r = 0.91
D) 0 - 0.05
D) r = 0.45
28) For the chi-square test, what is the value of the DF for a test with 4 categories and a sample of n=100?
A) 96
B) 4
C) 3
D) 99
29) In the T-test, the null hypothesis states that:
A) there is no difference between the two means being examined
B) there is a difference between the two means being examined
C) there is no relationship between the two means being examined
D) there is a relationship between the two means being examined
30) Suppose data are normally distributed with a mean of 120 and a standard deviation of 30. Between
what two values will approximately 68% of the data fall?
A) 60 and 180
B) 90 and 150
C) 30 and 210
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D) 105 and 135