Question

reviewing the concepts: dna structure and replication
part i. vocabulary practice: use the word bank below to fill in the blanks. all words will be used.
phosphate adenine guanine dna polymerase helicase primase
deoxyribose nucleotide nitrogen base semi - conservative

1. a ________ is the basic building block of a nucleic acid.
2. the backbone of the dna molecule is composed of a ______ and ______ sugar.
3. a nucleotide is composed of a sugar, phosphate and ________.
4. in the dna molecules, the base ______ pairs with thymine and the base ______ pairs with cytosine.
5. dna replication is considered ________, as each new strand of dna is composed of one new strand of nucleotides and one original strand of nucleotides.
6. in dna replication, the enzyme ______ \unzips\ the dna double helix, ____ adds a molecule of rna to the separated strands to indicate where replication should begin, and ______ adds new nucleotides to the separated strands.

part ii. diagram labeling
using the word bank, label the
diagram of the dna double helix.
hydrogen bond
sugar
phosphate
nitrogen base
nucleotide

Explanation:

1. Nucleotide is the basic unit of nucleic acids.
2. DNA backbone has phosphate and deoxyribose.
3. Nucleotide components: sugar, phosphate, nitrogen base.
4. Adenine pairs with thymine; guanine with cytosine.
5. DNA replication is semi - conservative.
6. Helicase unzips; primase adds RNA; DNA polymerase adds nucleotides.

Answer:

1. Nucleotide
2. Phosphate, Deoxyribose
3. Nitrogen Base
4. Adenine, Guanine
5. Semi - Conservative
6. Helicase, Primase, DNA Polymerase