DNA Structure

The diagram shows the base sequence of a strand of DNA.
From left to right, what is the sequence of the complementary strand of DNA in this molecule?

• T G A A C
• A C T  T G
• T G U U C
• U C T T G

What happens to the DNA helix when a cell reproduces?

• It partially dissolves in the cytoplasm

• It unzips and makes a copy of itself

• It forms a vesicle until division is complete

• It forms a plasmid and doubles in size

The analysis of a DNA molecule reveals that 30% of its nucleotides are adenine. What percentage of the same DNA molecule would be expected to be guanine nucleotides?

• 20%

• 30%

• 40%

• 60%

What is the segment of DNA that contains information to synthesize a specific protein molecule?

• Chromosome

• Codon

• Gene

• RNA

Identify the complementary DNA strand to the following:

5' ATT TGC CCC 3'

• 3' UAA ACG GGG 3'

• 3' UAA ACG GGG 5'

• 3' TAA ACG GGG 5'

• 5'TAA ACG GGG 3'

A nucleotide in DNA consists of what

• a sugar phosphate backbone and nitrogenous bases

• a sugar, a phosphate, and a nitrogen

• adenine, thymine, guanine, cytosine

• a sugar and a phosphate molecule

What is DNA made of?

• Sugar, Phosphate, nitrogen base

• Phosphate, Adenine, nitrogen base

• Thymine, Adenine, Cytomine

• Phosphate, Nitrogen, Adenine

Adenine bonds with ______________.

• Guanine
• Thymine
• Cytosine
• Adenine

Guanine bonds with ______________.

• Adenine
• Guanine
• Cytosine
• Thymine

What are the 4 nitrogen bases?

• adenine, thymine, cytoplasm, and guanine

• adenine, thymine, cytosine, and guanine

• adenine, thymine, cytosine, and gylcerol

• adenine, thymine, cytosine, and glucose