Question

name
class
date
active reading continued
skill: interpreting graphics

1. the figure below shows dna replicating. in the space provided, describe what is occurring at each lettered section of the figure.

part a.
part b.
part c.
part a.________________
part b.________________
part c.________________
in the space provided, write the letter of the term or phrase that best completes the statement.
____5. dna helicases and dna polymerases are alike in that both are
a. nucleotides.
b. nitrogenous bases.
c. enzymes.
d. both (a) and (b)

Explanation:

• Part a: DNA helicase unwinds the double - helix structure of DNA. It breaks the hydrogen bonds between the base pairs, creating a replication fork.
• Part b: DNA polymerase synthesizes new DNA strands. It adds nucleotides to the growing DNA strand, following the base - pairing rules (A - T and C - G).
• Part c: Two new DNA molecules are formed. Each new DNA molecule consists of one original (parent) strand and one newly synthesized (daughter) strand, which is the result of semi - conservative replication.
• For question 5: DNA helicases and DNA polymerases are both enzymes. Nucleotides are the building blocks of DNA (e.g., adenine nucleotide, thymine nucleotide etc.), and nitrogenous bases (adenine, thymine, cytosine, guanine) are part of nucleotides. Enzymes are proteins that catalyze biological reactions. DNA helicase catalyzes the unwinding of DNA, and DNA polymerase catalyzes the synthesis of new DNA strands.

Answer:

• Part a: DNA helicase unwinds the DNA double - helix.
• Part b: DNA polymerase synthesizes new DNA strands.
• Part c: Two new DNA molecules (semi - conservatively replicated) are formed.
• 5. C. enzymes.