Exploring DNA Structure and Replication

What does DNA stand for?

• Deoxyribonucleic Acid

• Deoxyribose Nucleic Atom

• Deoxyribose Nucleic Acid

• Deoxyribonucleic Atom

What shape is DNA often compared to?

• A straight ladder

• A twisted ladder

• A flat staircase

• A circular ring

Who used an x-ray method to photograph DNA molecules in 1952?

• James Watson

• Rosalind Franklin

• Gregor Mendel

• Francis Crick

What are the sides of the DNA ladder made of?

• Proteins and lipids

• Sugars and phosphates

• Nucleotides and bases

• Amino acids and enzymes

Which nitrogen base pairs with adenine?

• Guanine

• Cytosine

• Thymine

• Uracil

Which nitrogen base pairs with guanine?

• Thymine

• Adenine

• Cytosine

• Uracil

What is the key to understanding DNA replication?

• The pairing pattern of nitrogen bases

• The shape of the DNA molecule

• The number of chromosomes

• The length of the DNA strand

What happens first during DNA replication?

• New nitrogen bases are created

• The DNA molecule is duplicated

• The two sides of the DNA molecule unwind and separate

• The DNA molecule is cut into pieces

Where do the nitrogen bases that pair with the original DNA bases come from?

• The cytoplasm

• The cell membrane

• The nucleus

• The mitochondria

What is the result of DNA replication?

• Four new DNA molecules

• One new DNA molecule

• Two new DNA molecules

• Three new DNA molecules