BSC 2010 EXAM 4 CHAPTERS 14-17 QUESTIONS AND ANSWERS
| BSC 2010 STUDY GUIDE & PRACTICE TEST 2026/2027
Two chains of DNA must run in ____ direction and must be ____ if they are to bond with each other -
correct answer ✔✔antiparallel; complimentary
When a ribosome first attaches to an mRNA molecule, one tRNA binds to the ribosome. The tRNA that
recognizes the initiation codon binds to the: - correct answer ✔✔P site of the ribosome
In crossing a homozygous recessive with a heterozygote, what is the chance of getting an offspring with
the homozygous recessive phenotype? - correct answer ✔✔50%
A particular triplet of bases in the coding sequence of DNA is ATT. The anticodon on the tRNA that binds
to the mRNA codon is: - correct answer ✔✔AUU
The following is true of the leading and lagging strand respectively - correct answer ✔✔forms
continuously, forms in short pieces
DNA replication is considered - correct answer ✔✔semiconservative
In replication of DNA - correct answer ✔✔the strands separate and act as templates for new helices to
form
Which of the following does not occur during DNA replication? - correct answer ✔✔polymerization 3' to
5'
The primer used for DNA replication - correct answer ✔✔is present only once on the leading strand
The 3' end of a DNA strand is defined as the place where: - correct answer ✔✔there is a free OH group
at the 3' carbon of deoxyribose
The role of DNA ligase in replication is to: - correct answer ✔✔bond Okazaki fragments to one another
Incorrect bases that are added to DNA: - correct answer ✔✔can be removed by proof reading
A region of DNA template strand has the sequence 3' - ATTCGC - 5'. What is the sequence of mRNA
transcribed from this DNA? - correct answer ✔✔5' - UAAGCG - 3'
Transcription: - correct answer ✔✔produces only mRNA
Which statement about translation is NOT true? - correct answer ✔✔Okazaki fragments are involved
Fragile X syndrome: - correct answer ✔✔requires a short DNA sequence that is repeated many times
Epistasis means: - correct answer ✔✔one gene affects expression of another
, What are the predicted genotypes of two parents which are both blood type AB? - correct answer ✔✔a,
b, ab
If a color blind man marries a normal woman and color blindness is an x linked recessive, what is the
probability of a daughter that is color blind? - correct answer ✔✔0%
Alcaptonuria is an autosomal recessive. If a man with alcaptonuria marries a woman that is a carrier,
what is the probability that an affected child will be produced? - correct answer ✔✔50%
An allele is: - correct answer ✔✔a gene that has alternative forms
Sequences of DNA that are non coding: - correct answer ✔✔are introns and are not translated
An individual of genotype AA BB CC Dd Ee Ff Gg could produce how many different kinds of gametes? -
correct answer ✔✔16
Polydactlyl is an autosomal dominant trait. A man and woman with polydactlyl marry. What is the
probability that their children will have polydactlyl if homozygous dominant is lethal? - correct answer
✔✔66 2/3%
The base segments that function in protein synthesis on the tRNA are called: - correct answer
✔✔anticodons
Regarding the structure of DNA: - correct answer ✔✔the strands are antiparallel; they are composed of
a sugar, phosphate and nitrogenous base; they are hydrogen bonded; the 3' end has a free OH group
Which of the following adds new nucleotides to the New DNA being synthesized? - correct answer
✔✔DNA polymerase
In DNA replication, the lagging strand: - correct answer ✔✔is synthesized in a series of Okazaki
fragments
Okazaki fragments are joined together by: - correct answer ✔✔DNA ligase
______ at the end of eukaryotic chromosomes shorten with every cell replication event: - correct answer
✔✔telomeres
A man with Hemophilia (sex-linked recessive) marries a woman that is a carrier. What is the probability
that they will have:
a) A son with Hemophilia?
b) A carrier daughter?
c) A daughter with Hemophilia?
d) A genotypically normal son?
e) A genotypically normal daughter?
f) A carrier son? - correct answer ✔✔a) 50%
b) 50%
c) 50%
| BSC 2010 STUDY GUIDE & PRACTICE TEST 2026/2027
Two chains of DNA must run in ____ direction and must be ____ if they are to bond with each other -
correct answer ✔✔antiparallel; complimentary
When a ribosome first attaches to an mRNA molecule, one tRNA binds to the ribosome. The tRNA that
recognizes the initiation codon binds to the: - correct answer ✔✔P site of the ribosome
In crossing a homozygous recessive with a heterozygote, what is the chance of getting an offspring with
the homozygous recessive phenotype? - correct answer ✔✔50%
A particular triplet of bases in the coding sequence of DNA is ATT. The anticodon on the tRNA that binds
to the mRNA codon is: - correct answer ✔✔AUU
The following is true of the leading and lagging strand respectively - correct answer ✔✔forms
continuously, forms in short pieces
DNA replication is considered - correct answer ✔✔semiconservative
In replication of DNA - correct answer ✔✔the strands separate and act as templates for new helices to
form
Which of the following does not occur during DNA replication? - correct answer ✔✔polymerization 3' to
5'
The primer used for DNA replication - correct answer ✔✔is present only once on the leading strand
The 3' end of a DNA strand is defined as the place where: - correct answer ✔✔there is a free OH group
at the 3' carbon of deoxyribose
The role of DNA ligase in replication is to: - correct answer ✔✔bond Okazaki fragments to one another
Incorrect bases that are added to DNA: - correct answer ✔✔can be removed by proof reading
A region of DNA template strand has the sequence 3' - ATTCGC - 5'. What is the sequence of mRNA
transcribed from this DNA? - correct answer ✔✔5' - UAAGCG - 3'
Transcription: - correct answer ✔✔produces only mRNA
Which statement about translation is NOT true? - correct answer ✔✔Okazaki fragments are involved
Fragile X syndrome: - correct answer ✔✔requires a short DNA sequence that is repeated many times
Epistasis means: - correct answer ✔✔one gene affects expression of another
, What are the predicted genotypes of two parents which are both blood type AB? - correct answer ✔✔a,
b, ab
If a color blind man marries a normal woman and color blindness is an x linked recessive, what is the
probability of a daughter that is color blind? - correct answer ✔✔0%
Alcaptonuria is an autosomal recessive. If a man with alcaptonuria marries a woman that is a carrier,
what is the probability that an affected child will be produced? - correct answer ✔✔50%
An allele is: - correct answer ✔✔a gene that has alternative forms
Sequences of DNA that are non coding: - correct answer ✔✔are introns and are not translated
An individual of genotype AA BB CC Dd Ee Ff Gg could produce how many different kinds of gametes? -
correct answer ✔✔16
Polydactlyl is an autosomal dominant trait. A man and woman with polydactlyl marry. What is the
probability that their children will have polydactlyl if homozygous dominant is lethal? - correct answer
✔✔66 2/3%
The base segments that function in protein synthesis on the tRNA are called: - correct answer
✔✔anticodons
Regarding the structure of DNA: - correct answer ✔✔the strands are antiparallel; they are composed of
a sugar, phosphate and nitrogenous base; they are hydrogen bonded; the 3' end has a free OH group
Which of the following adds new nucleotides to the New DNA being synthesized? - correct answer
✔✔DNA polymerase
In DNA replication, the lagging strand: - correct answer ✔✔is synthesized in a series of Okazaki
fragments
Okazaki fragments are joined together by: - correct answer ✔✔DNA ligase
______ at the end of eukaryotic chromosomes shorten with every cell replication event: - correct answer
✔✔telomeres
A man with Hemophilia (sex-linked recessive) marries a woman that is a carrier. What is the probability
that they will have:
a) A son with Hemophilia?
b) A carrier daughter?
c) A daughter with Hemophilia?
d) A genotypically normal son?
e) A genotypically normal daughter?
f) A carrier son? - correct answer ✔✔a) 50%
b) 50%
c) 50%
