Student Exploration: Building DNA
Vocabulary: double helix, DNA, enzyme, mutation, nitrogenous base, nucleoside, nucleotide,
replication
Prior knowledge Questions (Do these BEFORE using the Gizmo)
DNA is an incredible molecule that forms the basis of life on Earth DNA molecules contain
instructions for building every living organism on Earth, from the tiniest bacterium to a massive
blue whale DNA also has the ability to replicate, or make copies of itself. This allows living
things to grow and reproduce
Look at the DNA molecule shown at right. What does it look like?
This shape is called a double helix
2. Based on this picture, how do you think a DNA molecule makes a
copy of itself? (Hint Look at the bottom two "rungs' of the ladder)

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.

1. law of superposition: when there are horizontal layers of rock. the layers at the top are the youngest.

2. law of uncomformity: where one layer is much younger than the previous one, therefore creating a gap in the time record.

3. inclusion: when there is a solid stone inside of another.

4. intrusion: a feature formed when a stone is filled with magma.

hope i answered your question.