Journey Into Dna

Name ______Period _____ Journey Into DNA Go to the following website: www.pbs.org/wgbh/nova/genome/dna.html# Click on the flash version of the graphic and wait for it to load. Read each paragraph about a different aspect of DNA. Complete the worksheet section for that slide. When you have finished reading and have answered the question(s), click on the + magnifying glass to go to the next slide. Continue doing this until you have gone through all 15 slides. Main page: What is the structure of DNA?

Human body: How many cells does the human body contain?

What is the only type of cell in the human body that contains no nucleus and therefore no nuclear DNA?

Intestines: Is the DNA code from cell to cell in the human body the same?

Cells: How are new types of cells produced?

Nucleus: The nucleus acts as the control center for the cell, what 3 jobs does it have?

Human genome: The human genome is comprised of two sets of ______chromosomes.

About ______% of the genome consists of sequences that have no known function.

Within the other 3% are an estimated ______genes.

Chromosome: Draw what a single chromosome looks like.

Chromosome banding: Each of the 23 chromosome types has a ______. Name ______Period _____

Gene: A single gene can range in length from ______.

Chromatin loops: There is a lot of DNA within the nucleus-about ______feet if you could unravel it and stretch it out.

Chromatin scaffold: Chromatin refers to ______that help organize the long DNA molecule.

Nucleosome:

Double helix: Which two scientists used Rosalind Franklin’s photo 51 to piece together the first accurate model of DNA? The structure of DNA resembles a ______.

DNA bases: Name the base for each abbreviation: T = A = C = G = A always pairs up with ______. C always pairs up with ______.

One nucleotide: The sides of the DNA ladder consist of a long string of ______and ______molecules, to which the bases are attached. Each sugar-phosphate-base combination is called a ______.

Molecular structure: How many sequences of bases exist in the human genome?

Scientists have completed determining the sequence of the human genome, what are they working on now?