Base pairing in the double helix explains how DNA can be copied because each base on one strand pairs with ____ .

Each strand of the double helix has ____ of the information needed to reconstruct the other half by the mechanism of base pairing.

Because each strand can be used to make the other strand, the strands are said to be ______.

Before a cell divides, it duplicates its DNA in a copying process called ______.

Before a cell divides, it duplicates its DNA in a copying process called replication during the ___ phase of the cell cycle.

During replication, the two strands of each DNA molecule ____.

During replication, after the two strands separate, the two new complementary strands are then ____ following the rules of base pairing.

During replication, each strand of the double helix of DNA serves as a ____ for the new strand.

DNA replication is _____, which means that each DNA molecule resulting from replication has one of the two original strands and one new strand.

If the base on the original strand is adenine, then ____ is added to the newly forming strand.

If the original strand has guanine, it is always paired with ____

A strand that has the base sequence TACGTT produces a strand with the complimentary base sequence ____

DNA replication is carried out during the S phase of the cell cycle by a series of ____

At the start of DNA replication, the enzymes first "unzip" a molecule of DNA by breaking the _____ bonds between base pairs and unwinding the two strands of the molecule.

During DNA replication, each strand serves as a ____ for the attachment of complementary bases.

The principal enzyme involved in DNA replication is called _____

DNA polymerase joins _____ to synthesize a new complementary strand of DNA.

During replication, DNA polymerase ____ each new DNA strand, so that each molecule is a near-perfect copy of the original.

During DNA replication, the DNA molecule produces ___ new complementary strands.

The tips of eukaryotic chromosomes are known as ____

Because the ends of a DNA molecule are difficult to replicate, cells use a special enzyme, called ____, to do the job.

Telomerase adds short, repeated DNA sequences to ____ as the chromosomes are replicated.

In rapidly dividing cells, telomerase helps to prevent genes near the ends of chromosomes from being ______ or _____during replication.

Telomerase is often switched off in ____ cells.

In ____ cells, telomerase may be activated, enabling these cells to grow and proliferate rapidly.