All GED Science Resources
Example Questions
Example Question #3 : Dna, Rna, And Proteins
Which of the following statements is false?
RNA contains the nitrogenous base uracil
The RNA backbone contains the carbohydrate ribose
RNA is more stable than DNA
RNA is usually single-stranded, while DNA is usually double-stranded
RNA is more stable than DNA
Because RNA is usually single-stranded (vs. double-stranded DNA), it is more susceptible to degradation by nucleases; therefore, RNA is NOT more stable than DNA.
RNA does contain the carbohydrate sugar ribose in its backbone, while DNA contains the sugar deoxyribose. RNA contains the nitrogenous base uracil; in contrast, DNA contains thymine.
Example Question #4 : Dna, Rna, And Proteins
What is the name of the segment of DNA that RNA polymerase attaches to in order to initiate transcription?
Origin of replication
Terminator
Promoter
Operator
Promoter
Transcription is initiated when RNA polymerase attaches to DNA at the promoter site. This allows the RNA polymerase to be appropriately positioned so that the whole gene is transcribed.
The origin of replication is the site that allows the initiation of DNA replication. Operators are segments of DNA that can bind transcription factors and regulate certain genes.