Unit 3: Nucleic Acids and Protein Synthesis

DNA vs. RNA

1. DNA is made of ​ (a)   strand(s) and RNA is made of ​ (b)   strand(s).​

2. DNA and RNA both have four bases, but only 3 in common. The base unique to DNA is ​ (c)   and the base unique to RNA is ​ (d)   .

• 1
• 2
• thymine
• uracil

Label the nucleotide.

a

b

c

Phosphate group

5-carbon sugar

Nitrogenous base

DNA and RNA nucleotides both contain a 5-carbon sugar. In DNA, the sugar is (a)   . In RNA, the sugar is ​ (b)   .

• deoxyribose
• ribose

DNA and RNA are both classified as the biomolecule, ​ (a)   . That means that they are both made up of the monomer, ​ (b)   .

• nucleic acid
• lipid
• protein
• carbohydrate
• nucleotide
• glycerol and fatty acid
• amino acid
• monosaccharide

DNA Base pairing rule:

• G

• A

• C

• T

• A

• C

• T

• G

Nitrogenous bases in DNA are held together by:

• polar bonds

• hydrogen bonds

• covalent bonds

• nonpolar bonds

DNA can travel outside of the nucleus.

• True

• False

Which part of a DNA molecule represents encoded information?

• Nitrogenous base (A,T,C,G)

• Phosphate group

• 5-carbon sugar

• Hydrogen bond

Each strand of a DNA molecule contains nitrogenous bases that pair with other nitrogenous bases on another strand. A diagram of a section of DNA is shown in the picture. Which DNA strand is complementary to the one shown?

• 
• 
• 
• 

What is the complementary sequence to the DNA strand provided?

• GAGT

• TCTG

• AGAC

• GAGU