Year 10 Bio Revision

The picture below shows an enzyme unwinding and unzipping DNA.

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​What is the name of this enzyme?

• DNA Helicase

• DNA Ligase

• DNA polyermase

• RNA Polymerase

Which of the following DNA nucleotides are paired with the correct corresponding DNA nucleotide? (mark all that apply)

• Adenine with Thymine

• Guanine with Cytosine

• Thymine with Cytosine

• Adenine with Uracil.

• Uracil with Thymine

Which is the role of DNA polymerase?

• Unwinds the original DNA strand

• Lays down RNA primer for new nucleotide bases.

• Builds new strands by bringing in new nucleotide bases.

• Remove Okazaki fragments for new nucleotides.

Nitrogenous bases are joined by which type of bond?

• polar bonds
• ionic bonds
• covalent bonds
• hydrogen bonds

What makes up the SIDES of a DNA ladder?

• nitrogen bases

• sugars & phosphates

• genes & chromosomes

• RNA

If one strand of a DNA molecule has the following order of bases, what will be the correct order of bases on the complementary (matching) strand?

AATTGGCC

• AATTGGCC

• TTAACCGG

• GGCCAATT

• GACTGACT

Choose the correct complementary nucleotide sequence for the following:

AAA - GTA - CCC

• CCC - TGA - AAA

• AAA - CAG - GGG

• TTT - CAT - GGG

• GGG - TGA - CCC

Choose the correct complementary nucleotide sequence for the following:

CCC - ACT - GGG

• CCC - TGA - AAA

• AAA - CAG - GGG

• TTT - CAT - GGG

• GGG - TGA - CCC

What percentage of chromosomes are contributed by a sperm cell?

• 75%
• 25%
• 50%
• 100%

Before a cell can divide, what must happen?

• Nothing, it is always ready to divide
• The number of chromosomes must be reduced by half
• The  chromosomes must replicate
• The number of chromosomes must triple.