AP Biology DNA Practice Test

How do the leading, and the lagging strands differ?

• The leading strand is synthesized in the same direction as the movement of the replication fork, and the lagging strand is synthesized in the opposite direction.
• The leading strand is synthesized at twice the rate of the lagging strand.
• The leading strand is synthesized in short fragments that are ultimately stitched together, whereas the lagging strand is synthesized continuously. 
• The leading strand is synthesized by adding nucleotides to the 3' end of the growing strand, and the lagging strand is synthesized by adding nucleotides to the 5? end. 

Suppose a double-stranded DNA molecule was shown to have 15% adenine bases. What would be the expected percentage of guanine bases in that molecule?

• 15%
• 35%
• 85%
• Not enough information

Consider the replication bubble diagrammed at the right. Which letters represent leading strands? 

• W and X
• Y and Z
• W and Z
• X and Y

Which enyzme would be found only on the lagging strand?

• DNA polymerase
• Primase
• Ligase
• Topoisomerase

Which enzyme is not working correctly if new DNA bases are not added to the template strand?

• DNA Polymerase
• Topoisomerase
• Ligase
• Primase

What is meant that DNA replication follows a “semi-conservative” model?

• After DNA replication, each strand contains one side that is a parental strand and the other side is a daughter strand.
• After DNA replication, one completed strand contains only parental DNA while the other contains only daughter DNA.
• None of these identify the “semi-conservative” model.
• After DNA replication, one completed strand contains a mixture of both parental DNA and daughter DNA dispersed throughout the strand.

Which RNA bases would pair with TACGAA in transcription? 

• AUGCUU
• ATGCTT
• GCATCC
• GCAUCC

Which pre-mRNA processing step is important for initiating translation?

• poly-A tail
• RNA editing
• splicing
• 7-methylguanosine cap

Protein molecules around which DNA is tightly coiled in chromatin

• Histones
• Whey
• Casein
• Hemoglobin

Tags

NGSS.HS-LS1-1

The parts of a gene that do NOT code for amino acids in a protein are called

• introns
• exons
• codons
• anticodons