BSC 108 EXAM 3 QUESTIONS AND
ANSWERS. VERIFIED 2025/2026.
Describe the process of transcription. What are the starting molecules and the end products? -
ANS Transcription is the manufacture of a strand of RNA complementary to a strand of DNA.
In initiation, RNA polymerase binds to a promoter region on the DNA strand. RNA synthesis
occurs during the elongation phase as RNA nucleotides are added to the growing RNA
polynucleotide. When the RNA polymerase reaches the terminator region of the gene,
elongation stops and the polymerase and new RNA molecule detach. The starting molecules are
DNA, RNA polymerase, and RNA nucleotides. The end product is a new strand of RNA.
a three-nucleotide sequence of DNA or mRNA that specifies a particular amino acid or
termination signal - ANS Codon
an infectious form of a protein - ANS Prion
a virus that infects bacteria - ANS Bacteriophage
a noncoding portion of a gene - ANS Intron
a coding portion of a gene - ANS Exon
a specific sequence of three nucleotides that is complementary to a codon - ANS Anticodon
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, T/F DNA and RNA are polymers composed of nucleotide monomers. - ANS True
How many nucleotides make up a codon? - ANS three
Translation converts the information stored in ____ to ____. - ANS RNA; polypeptide
T/F The three parts of a nucleotide are a sugar, a phosphate, and an anticodon. - ANS False
The three parts of a nucleotide - ANS nitrogenous base, pentose sugar, phosphate group
T/F After replication, each new DNA double helix consists of one old strand and one new strand.
- ANS True
A geneticist finds that a particular mutation has no effect on the polypeptide encoded by the
gene. This mutation probably involves - ANS deletion of one nucleotide.
Which of the following is the correct sequence of events that occurs during transcription? -
ANS initiation, elongation, termination
Describe the role of mRNA. - ANS Messenger RNA encodes genetic information from DNA
and conveys it to the ribosomes, where the information is translated into amino acid sequences.
If one strand of DNA has the sequence ATCCGA, what is the sequence of the other strand? -
ANS TAGGCT
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
ANSWERS. VERIFIED 2025/2026.
Describe the process of transcription. What are the starting molecules and the end products? -
ANS Transcription is the manufacture of a strand of RNA complementary to a strand of DNA.
In initiation, RNA polymerase binds to a promoter region on the DNA strand. RNA synthesis
occurs during the elongation phase as RNA nucleotides are added to the growing RNA
polynucleotide. When the RNA polymerase reaches the terminator region of the gene,
elongation stops and the polymerase and new RNA molecule detach. The starting molecules are
DNA, RNA polymerase, and RNA nucleotides. The end product is a new strand of RNA.
a three-nucleotide sequence of DNA or mRNA that specifies a particular amino acid or
termination signal - ANS Codon
an infectious form of a protein - ANS Prion
a virus that infects bacteria - ANS Bacteriophage
a noncoding portion of a gene - ANS Intron
a coding portion of a gene - ANS Exon
a specific sequence of three nucleotides that is complementary to a codon - ANS Anticodon
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, T/F DNA and RNA are polymers composed of nucleotide monomers. - ANS True
How many nucleotides make up a codon? - ANS three
Translation converts the information stored in ____ to ____. - ANS RNA; polypeptide
T/F The three parts of a nucleotide are a sugar, a phosphate, and an anticodon. - ANS False
The three parts of a nucleotide - ANS nitrogenous base, pentose sugar, phosphate group
T/F After replication, each new DNA double helix consists of one old strand and one new strand.
- ANS True
A geneticist finds that a particular mutation has no effect on the polypeptide encoded by the
gene. This mutation probably involves - ANS deletion of one nucleotide.
Which of the following is the correct sequence of events that occurs during transcription? -
ANS initiation, elongation, termination
Describe the role of mRNA. - ANS Messenger RNA encodes genetic information from DNA
and conveys it to the ribosomes, where the information is translated into amino acid sequences.
If one strand of DNA has the sequence ATCCGA, what is the sequence of the other strand? -
ANS TAGGCT
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
