High School Biology : Understanding Replication Regulation
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Example Questions
Example Question #21 : Dna Replication
Which enzyme is responsible for forming a new strand of DNA?
DNA Polymerase
Helicase
Amylase
Synthase
RNA Polymerase
DNA Polymerase
DNA polymerase is responsible for joining nucleotide subunits to form the new strand of DNA during replication. In contrast, RNA polymerase will join nucleotides to form strands of RNA during transcription. Amylase is found in saliva and catalyzes the breakdown of starch and carbohydrates. Synthases are a class of enzyme that act as catalysts for joining two molecules. Helicase uncoils double-stranded DNA, allowing the formation of the replication fork.
Example Question #21 : Dna Replication
When considering the regulatory processes behind DNA replication, what is special about chloroplast and mitochondrial genomes?
The cell checkpoints in these types of replication are only limited by available fuel.
Replication occurs independently from the cell cycle.
There are no regulatory checkpoints on these types of replication.
There is no well-defined cycle of replication for chloroplasts or mitochondria, and their DNA instead replicates continuously.
Cyclins and cyclin-dependent kinases are strengthened in these types of replication.
Replication occurs independently from the cell cycle.
Replication of chloroplast cells in plants and mitochondrial DNA in advanced cells occurs independently of the cell cycle, follwing instead the process known as D-Loop Replication.
Example Question #21 : Dna Replication
To what process does the term "transcription" refer?
Transcription is the process of tRNA carrying amino acids to a polypeptide being built
Transcription is the process of "writing" RNA from DNA
Transcription is the process of "writing" proteins from DNA
Transcription is the process of "writing" proteins from RNA
Transcription is the process of rRNA building ribosomes
Transcription is the process of "writing" RNA from DNA
The conversion of DNA into RNA is known as transcription. A DNA template is read to produce a complementary RNA strand.
The conversion of RNA to protein is described by translation, and is completed with the help of mRNA. You cannot transition from DNA straight to protein without these intermediary steps. tRNA is used to carrying amino acids to a growing polypeptide, and rRNA is used to build ribosomes, but these processes are not considered parts of transcription.
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