The attachment of nucleotides to form a complementary strand of DNA during replication

Biology

1 answer:

olga2289 [7]3 years ago

6 0

Answer: is accomplished by DNA polymerase.

Explanation: DNA polymerase is an enzyme that catalyzes the synthesis of a complementary strand of a DNA molecule during replication. The double stranded DNA helix is first unwind by the enzyme known as helicase giving rise to two DNA strands which serve as templates for replication. DNA polymerase then binds to a primer, a short nucleotide sequence and catalyzes the attachment of nucleotides to the primer to form a growing strand that is complementary to the parent DNA.

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The diagram below shows the layers of a rock having an ammonite:

sergiy2304 [10]

Answer:

Fossil Z is younger than Fossil Y.

Explanation:

For any age-related questions in geology, we have to consider the basic principle of stratigraphy. According to which, sediment layers on top harbor younger fossils whereas layers on the bottom have older fossils. In the case given here, Fossil Z is younger because it is in the top layer and Fossil Y is in the middle layer. The other two options are completely wrong because Fossil Y cannot be older than Fossi X and likewise, Fossil Z doesn't exist in multiple periods rather it is present only once.