DNA, RNA & Replication Quiz 24-25

Which of the following correctly describes the structure of a DNA nucleotide?

• Phosphate, ribose sugar, and base

• Phosphate, deoxyribose sugar, and base

• Phosphate, glucose sugar, and base

• Phosphate, sucrose sugar, and base

What is the primary structural difference between DNA and RNA?

• DNA is single-stranded, while RNA is double-stranded.

• DNA contains uracil, while RNA contains thymine.

• DNA is double-stranded, while RNA is single-stranded.

• DNA contains ribose sugar, while RNA contains deoxyribose sugar.

Which base is found in RNA but not in DNA?

• Adenine

• Thymine

• Uracil

• Cytosine

During DNA replication, which enzyme is responsible for unzipping the DNA strands?

• DNA polymerase

• Helicase

• Ligase

• Primase

What is the role of DNA polymerase during DNA replication?

• Unzips the DNA strands

• Builds complementary strands

• Joins Okazaki fragments

• Adds RNA primers

Which of the following statements best describes semiconservative replication?

• Each new DNA molecule contains two new strands.

• Each new DNA molecule contains one old strand and one new strand.

• Each new DNA molecule contains two old strands.

• Each new DNA molecule contains a mixture of old and new segments.

What is the sugar component of a nucleotide in RNA?

• Deoxyribose

• Ribose

• Glucose

• Fructose

What is the function of DNA polymerase's proofreading ability?

• To unzip the DNA strands

• To correct errors in the newly synthesized DNA strand

• To add RNA primers

• To join Okazaki fragments

Which of the following bases pair together in DNA?

• Adenine and Uracil

• Cytosine and Thymine

• Adenine and Thymine

• Guanine and Uracil

What is the main reason RNA can leave the nucleus while DNA cannot?

• RNA is more stable than DNA.

• RNA is single-stranded and can pass through nuclear pores.

• RNA is double-stranded and can pass through nuclear pores.

• RNA is smaller than DNA.