DNA Structure and Replication

In a molecule of double-stranded DNA, the amount of Adenine present is always equal to the amount of

• cytosine
• guanine
• thymine
• uracil

Guanine bonds with ______________.

• Adenine
• Guanine
• Cytosine
• Thymine

Why is DNA important?

• it is very small and very complicated
• it's in everything
• it serves as the blueprint for traits of all living things
• because we eat it every day for energy

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-1

Which 2 molecules form the sides (backbone) of the DNA ladder?

• deoxyribose sugar and adenine
• deoxyribose sugar and a hydrogen bond
• deoxyribose sugar and the nucleus
• deoxyribose sugar and phosphate

The enzyme that unzips the DNA to prepare for replication

• helicase
• replicase
• polymerase
• synthase

In what phase of the cell cycle does DNA replication take place?

• G1
• S
• G2
• M

What type of sugar is in DNA?

• glucose

• lactose

• deoxyribose

• ribose

What is the main function of DNA polymerase during DNA replication?

• To break hydrogen bonds between nitrogenous bases

• To add nucleotides to the growing DNA strand

• To unwind the DNA double helix

• To join Okazaki fragments

Which strand is synthesized continuously during DNA replication?

• Lagging strand

• Leading strand

• Both are synthesized discontinuously

• Neither, DNA replication is not continuous

Sometimes, DNA is called "semi-conservative." Why might this be?

• The old strand is "conserved" and used to make the new strands
• Uracil is "conserved" in that it is only used to make the new strands
• ATP is "conserved" via the usage of facilitated diffusion
• Ligase is "conserved" in that it is denatured by the process

Tags

NGSS.HS-LS3-2