AP Biology Replication

Which of the following best describes a DNA molecule?

• double helix
• contains ribose
• made of amino acids
• contains Uracil

Tags

NGSS.HS-LS1-1

Which sequence of DNA bases would pair with this partial strand
ATG TGA CAG

• ATG TGA CAG
• TAC ACT GTC
• GTA AGT GAC
• CAT TCA CTG

Seals the Okazaki fragments together

• DNA Polymerase
• ligase
• helicase
• primase

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.

Which enzyme is needed to start DNA replication?

• DNA Polymerase
• Topoisomerase
• Ligase
• Primase

Which of the following help(s) to hold the DNA strands apart while they are being replicated?

• RNA primase
• single–strand binding proteins
• DNA polymerase I
• DNA ligase

What is meant by the description "antiparallel" regarding the strands that make up DNA?

• The twisting nature of DNA creates nonparallel strands.
• One strand is positively charged and the other is negatively charged.
• The 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand.
• Base pairings create unequal spacing between the two DNA strands

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.

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

Which component of DNA determines the traits of an organism? 

• Nitrogen Bases
• Sugar-Phosphate Backbone
• Hydrogen bonds

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-1