Question

1. what does the word dna stand for?
2. dna is a polymer, which means that it is made up of many repeating subunits. what are the subunits called?
3. circle one complete nucleotide in the picture on the right.
4. how many total nucleotides are in the dna picture?
5. what are the 3 parts of a nucleotide? draw an arrow from each part you list below to where you can find it on the picture.
6. there are 4 different variations of these subunits (4 different bases), what are those?
7. the base pairs with. the base pairs with. this is called complementary base pairs. thus one strand of the dna is complementary to the other strand (opposite/matching). the scientist who discovered this is named
8. based on this base paring system, which of the following is/are true?

a. cells contain the same amount of t as a
b. cells contain the same amount of c as g
c. cells contain the same amount of t as g
d. cells contain the same amount of a as c

1. write a complementary sequence for this strand of dna underneath it:

aattggccoggtattagacgtt

1. dna is a double stranded molecule. because it is 2 strands which are coiled in a helical shape, dna is also known as a
2. dna is in the of cells. the two major functions (jobs) of dna are:

Explanation:

1. DNA stands for Deoxyribonucleic Acid.
2. DNA is made up of repeating subunits called nucleotides.
3. (This requires visual identification in the provided picture, which can't be done here. But the concept is to circle a unit with a phosphate group, a deoxyribose sugar, and a nitrogen - containing base.)
4. (Assuming the picture has 12 nucleotides as written in the original, but without seeing the picture, it's based on the given number.)
5. A nucleotide has three parts: a phosphate group, a deoxyribose sugar, and a nitrogen - containing base.
6. The four different bases are adenine (A), thymine (T), cytosine (C), and guanine (G).
7. Adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G). The scientist who discovered this is Erwin Chargaff (for the base - pairing rules, though Watson and Crick also built on this for the DNA structure).
8. According to Chargaff's rules:

• a. False.
• b. True (A pairs with T, so amount of A = amount of T; C pairs with G, so amount of C = amount of G).
• c. False.
• d. False.

1. The complementary sequence is TTAAGCCGCCAT AATCTGCAA (using A - T and C - G base - pairing).
2. DNA is also known as a double helix.
3. DNA is in the nucleus of cells. The two major functions of DNA are to store genetic information and to pass it on (replicate) during cell division.

Answer:

1. Deoxyribonucleic Acid
2. Nucleotides
3. (Visual task not completed here)
4. 12
5. Phosphate group, deoxyribose sugar, nitrogen - containing base
6. Adenine (A), thymine (T), cytosine (C), guanine (G)
7. A; T; C; G; Erwin Chargaff
8. b
9. TTAAGCCGCCAT AATCTGCAA
10. Double helix
11. Nucleus; Store genetic information and replicate (pass on genetic information)