the portion of the molecule in box 5 of figure 12-1 is:
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The portion of the molecule in box 5 of Figure 12-1 is:
a hydrogen bond.
a pyrimidine.
a nucleotide
a phosphate.
4%
68%
24%
4%
1. a hydrogen bond.
2. a pyrimidine.3. a nucleotide4. a phosphate.
The final product of DNA replication is:
DNA fragments.
mRNA, tR
NA, and rR
NA...
two DNA m
olecules, e
ac...
the enzymes n
eeded for ..
.
0% 0%
83%
17%
1. DNA fragments.2. mRNA, tRNA, and rRNA
molecules.3. two DNA molecules, each
of which contains one new and one old DNA strand.
4. the enzymes needed for further processes, such as DNA polymerase
Which of the following cause the unwinding of the DNA double helix?
Primoso
me
DNA helicase
RNA primer
RNA polymerase
DNA polymerase
4%
48%
36%
8%4%
1. Primosome2. DNA helicase3. RNA primer4. RNA polymerase5. DNA polymerase
A replication fork:
is a s
ite w
here one DNA ...
is cre
ated by the acti
on ..
is only
seen in pro
karyo
t..
is a Y
-shaped st
ructure ...
5%
73%
9%14%
1. is a site where one DNA strand serves as a template, but the other strand is not replicated.
2. is created by the action of the enzyme RNA polymerase.
3. is only seen in prokaryotic chromosomes.
4. is a Y-shaped structure where both DNA strands are replicated simultaneously.
Which of the following adds new nucleotides to a growing DNA chain?
DNA polymerase
Primase
RNA polymerase
DNA helicase
RNA primer
60%
16%
8%
0%
16%
1. DNA polymerase2. Primase3. RNA polymerase4. DNA helicase5. RNA primer
Why does DNA synthesis only proceed in the 5' to 3' direction?
Because that is
the dire
c...
Because that is
the only
...
Because the ch
romosom..
Because the 3'end of th
...
Because DNA polymerase
...
0%
9%
26%30%
35%1. Because that is the direction in which the two strands of DNA unzip.
2. Because that is the only direction that the polymerase can be oriented.
3. Because the chromosomes are always aligned in the 5'to 3'direction in the nucleus.
4. Because the 3'end of the polynucleotide molecule is more electronegative than the 5'end.
5. Because DNA polymerases can only add nucleotides to the 3'end of a polynucleotide strand.
The 5' end of each Okazaki fragment begins with:
a DNA primer b
inding to...
a separate RNA prim
er.
the sa
me RNA primer th
..
a small
DNA primer.
DNA polymerase binding...
32%
52%
4%0%
12%
1. a DNA primer binding to the template DNA.
2. a separate RNA primer.3. the same RNA primer that
began synthesis on the leading strand.
4. a small DNA primer.5. DNA polymerase binding to
the template DNA.
The DNA strand that is replicated smoothly and continuously is called the:
primary st
rand.
first st
rand.
leading s
trand.
alpha stra
nd.
lagging st
rand
16%
0% 0%4%
80%1. primary strand.2. first strand.3. leading strand.4. alpha strand.5. lagging strand
Okazaki fragments are joined together by:
DNA polymerase.
DNA ligase
RNA ligase.
primase.
RNA polymerase.
8%
54%
8%
17%13%
1. DNA polymerase.2. DNA ligase3. RNA ligase.4. primase.5. RNA polymerase.
What is the rounded hourglass-shaped
globule?
Helicase
Nitrogen b
ase
Ribosome
DNA
55%
0%
15%
30%1. Helicase2. Nitrogen base3. Ribosome4. DNA
According to Chargaff’s rule the following proportion exists in DNA
G=C G>C
G<C C=T
70%
22%
4%4%
a. G=C
b.G>C
c. G<C
d.C=T
If one side of the DNA strand is GTAATC, the other side will be this
GTAATC
ACGGCT
CATTAG
GGGCCC
8%0%
75%
17%
1. GTAATC2. ACGGCT3. CATTAG4. GGGCCC
The nitrogen bases of the DNA molecule are held together by these
Covalent b
onds
Phosphodieste
r bonds
Hydrogen bonds
Glue
9% 4%
83%
4%
1. Covalent bonds2. Phosphodiester
bonds3. Hydrogen bonds4. Glue
DNA is described as a double helix. Why?
A. It is
made of tw
o str..
.
B. It has t
wo complim
en...
C. Eve
ry part of D
NA ha...
D. It ca
n replic
ate itself a
..
8%0%0%
92%A. It is made of two strands
of RNA.B. It has two
complimentary strands that are coiled in a spiral.
C. Every part of DNA has a matching part on another chromosome.
D. It can replicate itself and made an identical copy.
What term describes the phosphate, sugar, and nitrogenous base groups
that make up DNA?
A. RNA
B. thym
ine
C. nucle
otide
D. pyrim
idine
4% 0%
84%
12%
A. RNAB. thymineC. nucleotideD. pyrimidine
The process of copying a gene's DNA sequence into a sequence of RNA is called
Replication
Transcription
Translation
PCR
21%
0%
29%
50%1. Replication2. Transcription3. Translation4. PCR
The transcribing enzyme is
Ligase
DNA polymerase
RNA polymerase
amino-acyl tr
ansferase
8% 4%
71%
17%
1. Ligase2. DNA polymerase3. RNA polymerase4. amino-acyl
transferase
Which molecule contains the genetic code?
RNA DNA
mRNA
tRNA
0% 0%
13%
87%1. RNA2. DNA3. mRNA4. tRNA
Transcription occurs along a ____ template forming an mRNA in the ____ direction.
5' to 3'; 5
' to 3‘
5' to 3'; 3
' to 5‘
3' to 5'; 5
' to 3‘
3' to 5'; 3
' to 5'
12%
0%
16%
72%1. 5' to 3'; 5' to 3‘2. 5' to 3'; 3' to 5‘3. 3' to 5'; 5' to 3‘4. 3' to 5'; 3' to 5'
RNA contains which bases?
adenine, thymine, g
uanin..
adenine, thymine, g
uani...
thym
ine, guanine, cy
tosin..
adenine, guanine, c
ytosin
..
8%
58%
8%
25%
1. adenine, thymine, guanine, cytosine, uracil
2. adenine, thymine, guanine, cytosine
3. thymine, guanine, cytosine, uracil
4. adenine, guanine, cytosine, uracil
Which mode of information transfer usually does not occur?
DNA to DNA
DNA to RNA
DNA to protein
all occu
r in a w
orking ce
ll
14%5%
71%
10%
1. DNA to DNA2. DNA to RNA3. DNA to protein4. all occur in a
working cell
A DNA strand with the sequence AACGTAACG is transcribed. What is the sequence of the mRNA
molecule synthesized?
AACGTAACG
UUGCAUUGC
AACGUAACG
TTGCATTGC
0%
17%
0%
83%1. AACGTAACG2. UUGCAUUGC3. AACGUAACG4. TTGCATTGC
Which of the following features is common to both DNA replication and transcription?
Nucleotides a
re added t...
Deoxyribonucle
otides ar...
Both RNA and DNA pol...
Both RNA and DNA pol...
68%
8%0%
24%
1. Nucleotides are added to the 3' end of the newly synthesized strand
2. Deoxyribonucleotides are incorporated into the growing sequence
3. Both RNA and DNA polymerase require oligonucleotide priming
4. Both RNA and DNA polymerase initiate at promoter sequences
The process of producing an amino acid polymer (polypeptide) from a RNA template is called __.
replic
ation
transcr
iption
transla
tion
duplication
4%0%
70%
26%
1. replication2. transcription3. translation4. duplication
Each amino acid in a protein is specified by
several g
enes.
a promoter.
an mRNA m
olecu...
a codon.
4%
91%
4%0%
1. several genes.2. a promoter.3. an mRNA molecule.4. a codon.
When mRNA leaves the cell's nucleus, it next becomes associated with
proteins.
a riboso
me.
tRNA.
RNA polymerase...
10%0%
25%
65%1. proteins.2. a ribosome.3. tRNA.4. RNA polymerase.
Considering the structure of double stranded DNA, what kinds of bonds hold one complementary strand to
the other?
ionic
covale
nt
Van der Waa
ls
hydroge
n
hydrophobic a
n...
0%9% 4%
87%
0%
1. ionic2. covalent3. Van der Waals4. hydrogen5. hydrophobic and
hydrophilic
What type of mutation is in the following DNA sequence? original: ATCGATCGCGAT
mutated: ATCGAACGCGAT
Inse
rtion
Translocation
Point
inversi
on
5% 5%
55%
36%1. Insertion2. Translocation3. Point4. inversion
In DNA guanine always pairs with
Adenine
Thymine
Cytosine
Uracil
8%0%
83%
8%
1. Adenine2. Thymine3. Cytosine4. Uracil
Enter question text...
1. Enter answer text...
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