How DNA Is Copied What does it mean that the two strands of DNA are complementary?
What is DNA replication?
Using your notes, book, and this assignment, place the steps of DNA replication in the correct order.
a. The enzyme DNA polymerase moves along the exposed strands and adds
complementary nucleotides to each nucleotide in each existing strand.
b. The DNA double helix breaks or unzips down the middle between the base
pairs.
c. A complementary strand is created for each of the two strands of the original
double helix.

There were three models suggested for DNA replication: conservative, semi-conservative, and dispersive.

The conservative method of replication suggests that parental DNA remains together and newly-formed daughter strands are also together.

The semi-conservative method of replication suggests that the two parental DNA strands serve as a template for new DNA and after replication, each double-stranded DNA contains one strand from the parental DNA and one new (daughter) strand.

The dispersive method of replication suggests that, after replication, the two daughter DNAs have alternating segments of both parental and newly-synthesized DNA interspersed on both strands.

Meselson and Stahl, using E. coli DNA made with two nitrogen istopes (14N and 15N) and density gradient centrifugation, determined that DNA replicated via the semi-conservative method of replication.

Key Terms

DNA replication: a biological process occuring in all living organisms that is the basis for biological inheritance

isotope: any of two or more forms of an element where the atoms have the same number of protons, but a different number of neutrons within their nuclei

Explanation:

b

Explanation:

answer: angiosperms

dicots

angiosperms are highly evolved plants, they produce seeds which are enclosed within in a carple. these are the largest group of plants on earth. they include trees, shrubs, herbs and small flowering plants. angiosperms exhibit a flowering stage in their life cycle. the flower serves the function of reproduction and fruit formation in majority of angiosperms. dicot is the term used to describe flowering plants that have two seed leaves. dicots are plants which develop seeds which split into two parts called cotyledons. each cotyledon contains one embryo.

here, a small purple flower development indicates that the plant belongs to angiosperms and having two embryonic leaves indicates it belongs to dicots.