DNA/RNA/PS

In an analysis of the nucleotide composition of DNA, which of the following will be found?

• A = C  
• A + C = G + T
• A = G and C = T
• G + C = A + T

In transcription, there is a promoter sequence located within the DNA that acts as the starting point for mRNA polymerase to transcribe DNA into mRNA.  Part of this promoter sequence includes a short sequence known as the TATA box, which is said to be highly conserved.  What is the evolutionary significance of this?

• The sequence evolves rapidly.
• The sequence has a high degree of mutation.
• The sequence is transcribed at the end of every gene.
• Mutations in this sequence are selected against. 

In transcription, there is a promoter sequence located within the DNA that acts as the starting point for mRNA polymerase to transcribe DNA into mRNA.  Part of this promoter sequence includes a short sequence known as the TATA box, which is said to be highly conserved.  What is the evolutionary significance of this?

• The sequence evolves rapidly.
• The sequence has a high degree of mutation.
• The sequence is transcribed at the end of every gene.
• Mutations in this sequence are selected against. 

What amino acid sequence will be generated based on the following mRNA codon sequence? AUG - GUA - AGU 

• met - val - ser
• met - ser - val
• met - glu - ser
• met - val - gly

A mutation occurs in the gene encoding the protein responsible for making DNA polymerase.  What will be the result?

• DNA will not unwind properly during the replication process.
• RNA nucleotides will not be properly matched up to their DNA complements during transcription.
• mRNA will not be correctly edited in eukaryote cells undergoing transcription.
• DNA nucleotides will not be properly matched up to their complements during replication.

DNA is said to be an antiparallel molecule.  What does this mean? 

• The twisting nature of DNA creates nonparallel strands.
• The 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand.
• One strand is positively charged and the other is negatively charged.
• One strand contains only purines and the other contains only pyrimidines.

Replicate the following strand of DNA: 
AATCATGGA

• AATCATGGA
• TTAGTACCT
• UUAGUACCU
• GGATAUCUA

The enzyme that unzips the DNA to prepare for replication

• helicase
• replicase
• polymerase
• synthase

DNA replication results in two DNA molecules,

• each one with two original strands
• each one with two new strands
• each one with one new strand and one original strand
• one with two new strands and the other with two original strands

order of replication

• 3, 2, 1, 4
• 2, 1, 4, 3
• 2, 3, 1, 4
• 3, 4, 1, 2