GENETICS EXAM QUESTIONS AND
CORRECT ANSWERS
The two strands of DNA are said to be ___ to each
other since adenine is always across the molecule
from thymine and cytosine is always across the
molecule from guanine. Pick the best answer.
Complementary
The nucleotides along each strand of DNA are joined
by ____ bonds.
___ bonds join one nucleotide to the next along a
strand of RNA.
Phosphodiester
Is the helical coiling shown in this picture a right-
handed or left-handed coil?
Right-Handed Coil
X-ray diffraction experiments conducted by ____ led
to the determination of the structure of DNA.
Wilkins, Franklin
There are ___ base pairs per turn in the Watson-Crick
model of DNA.
10
The following is a small fragment of DNA. Only one
strand is shown, but assume that the molecule is
double-stranded. How many hydrogen bonds are
present in this DNA molecule? Give your answer as a
number without units so that Moodle can grade it
,correctly.
5' - GGCTAGG - 3'
19
(Adenine pairs with Thymine using 2 hydrogen bonds
Guanine pairs with Cytosine using 3 hydrogen bonds)
The base composition of a double-stranded DNA
molecule is 12% adenine. What percentage of this
molecule is the base guanine? Give only the answer in
numerical form so that Moodle will grade your answer
correctly. Do not write "%".
38 (A=T/U G=C so A+G=50%)
The sequence of a template strand in a double-
stranded DNA molecule is
5'- ATTGCCAA -3'. What is the sequence of the mRNA
produced from this segment of DNA? Pick the best
answer.
5'- UUGGCAAU -3' (Write down the pairs then put it in
opposite order!!)
5'-A A C G A A U A U G U U A A U C G U A G C C A C
C U G G U U C A G C U A A G G U G A-3'
As this mRNA is translated, the third codon is
________. Fill in the blank with the correct codon
without any spaces, and nothing else so that Moodle
can grade this question correctly.
AUC
5' - C C G U A U G C A U U U C G G A C U U A G U A A
G G A C U G A C A U A A -3'
What is the sixth amino acid in the protein formed
from this mRNA? Fill in the blank with the name of the
,correct amino acid and nothing else so that Moodle
can grade your question correctly.
Ser
Is the helical coiling shown in this picture a right-
handed or left-handed coil? (Look at the pointed side
of the sword, not the handle)
Right-Handed Coil
The donuts in this picture were decorated to illustrate
the cell cycle. Which donut(s) represent telophase of
mitosis?
Donut 5
The donuts in this picture were decorated to illustrate
the cell cycle. Which donut(s) represent prophase of
mitosis?
Donut 2
Select all of the items below that are components of
DNA.
Deoxyribose, Phosphate, Adenine, Thymine, Guanine,
Cytosine
Approximately how many base pairs of DNA are in the
human genome?
3 billion
Refer to the biochemical pathway below for this
question. Note that "Enz" stands for enzyme. The
allele represented by the capital letter is dominant for
each gene. Individuals with the normal phenotype
produce the end product for this biochemical
pathway. Mutant individuals do not produce the end
product.
Classify each genotype as to whether it results in a
"Normal" or a "Mutant" phenotype.
, 1. Genotype bbeegg
2. Genotype BBEEGG
3. Genotype BbEeGg
4. Genotype BBEegg
5. Which enzyme(s) will an individual of genotype
BbeeGG produce? Select the best answer.
1. Mutant
2. Normal
3. Normal
4. Mutant
5. Enzymes B and G are produced
How many chromosomes are present in a normal
human gamete? Give your answer as a number.
23
A cell is haploid if there is one of each chromosome
type in the cell. A cell is diploid if there are two copies
of each chromosome type in the cell. Classify the cell
type below as either Haploid or Diploid.
Spermatid
Haploid
The coding strand of a normal and a mutant DNA
sequence are shown below:
Normal: 5' - T T A A T G G C C A A T G A C T A C T G
A A A - 3'
Mutant: 5' - T T A A T G G C C A A T G A T T A C T G A
A A - 3'
CORRECT ANSWERS
The two strands of DNA are said to be ___ to each
other since adenine is always across the molecule
from thymine and cytosine is always across the
molecule from guanine. Pick the best answer.
Complementary
The nucleotides along each strand of DNA are joined
by ____ bonds.
___ bonds join one nucleotide to the next along a
strand of RNA.
Phosphodiester
Is the helical coiling shown in this picture a right-
handed or left-handed coil?
Right-Handed Coil
X-ray diffraction experiments conducted by ____ led
to the determination of the structure of DNA.
Wilkins, Franklin
There are ___ base pairs per turn in the Watson-Crick
model of DNA.
10
The following is a small fragment of DNA. Only one
strand is shown, but assume that the molecule is
double-stranded. How many hydrogen bonds are
present in this DNA molecule? Give your answer as a
number without units so that Moodle can grade it
,correctly.
5' - GGCTAGG - 3'
19
(Adenine pairs with Thymine using 2 hydrogen bonds
Guanine pairs with Cytosine using 3 hydrogen bonds)
The base composition of a double-stranded DNA
molecule is 12% adenine. What percentage of this
molecule is the base guanine? Give only the answer in
numerical form so that Moodle will grade your answer
correctly. Do not write "%".
38 (A=T/U G=C so A+G=50%)
The sequence of a template strand in a double-
stranded DNA molecule is
5'- ATTGCCAA -3'. What is the sequence of the mRNA
produced from this segment of DNA? Pick the best
answer.
5'- UUGGCAAU -3' (Write down the pairs then put it in
opposite order!!)
5'-A A C G A A U A U G U U A A U C G U A G C C A C
C U G G U U C A G C U A A G G U G A-3'
As this mRNA is translated, the third codon is
________. Fill in the blank with the correct codon
without any spaces, and nothing else so that Moodle
can grade this question correctly.
AUC
5' - C C G U A U G C A U U U C G G A C U U A G U A A
G G A C U G A C A U A A -3'
What is the sixth amino acid in the protein formed
from this mRNA? Fill in the blank with the name of the
,correct amino acid and nothing else so that Moodle
can grade your question correctly.
Ser
Is the helical coiling shown in this picture a right-
handed or left-handed coil? (Look at the pointed side
of the sword, not the handle)
Right-Handed Coil
The donuts in this picture were decorated to illustrate
the cell cycle. Which donut(s) represent telophase of
mitosis?
Donut 5
The donuts in this picture were decorated to illustrate
the cell cycle. Which donut(s) represent prophase of
mitosis?
Donut 2
Select all of the items below that are components of
DNA.
Deoxyribose, Phosphate, Adenine, Thymine, Guanine,
Cytosine
Approximately how many base pairs of DNA are in the
human genome?
3 billion
Refer to the biochemical pathway below for this
question. Note that "Enz" stands for enzyme. The
allele represented by the capital letter is dominant for
each gene. Individuals with the normal phenotype
produce the end product for this biochemical
pathway. Mutant individuals do not produce the end
product.
Classify each genotype as to whether it results in a
"Normal" or a "Mutant" phenotype.
, 1. Genotype bbeegg
2. Genotype BBEEGG
3. Genotype BbEeGg
4. Genotype BBEegg
5. Which enzyme(s) will an individual of genotype
BbeeGG produce? Select the best answer.
1. Mutant
2. Normal
3. Normal
4. Mutant
5. Enzymes B and G are produced
How many chromosomes are present in a normal
human gamete? Give your answer as a number.
23
A cell is haploid if there is one of each chromosome
type in the cell. A cell is diploid if there are two copies
of each chromosome type in the cell. Classify the cell
type below as either Haploid or Diploid.
Spermatid
Haploid
The coding strand of a normal and a mutant DNA
sequence are shown below:
Normal: 5' - T T A A T G G C C A A T G A C T A C T G
A A A - 3'
Mutant: 5' - T T A A T G G C C A A T G A T T A C T G A
A A - 3'
