During DNA replication, what ensures the correct alignment of the incoming nucleotides against the template strand?

A. Hydrogen bond stability between A and T, G and C
B. The anti-parallel structure of the double helix
C. The activity of DNA polymerase
D. The presence of the primer

Which of the following statements about RNA is correct?

A. RNA molecules are double-stranded and contain the base thymine
B. RNA molecules are single-stranded and contain the base uracil
C. RNA molecules are double-stranded and contain the base uracil
D. RNA molecules are single-stranded and contain the base thymine

What is the significance of the 5' and 3' ends in DNA replication?

A. They determine the direction of transcription
B. They regulate the process of translation
C. They determine the direction of replication
D. They are responsible for the stability of the DNA molecule

Which component is not a part of a nucleotide?

A. Phosphate group
B. Pentose sugar
C. Nitrogenous base
D. Ribose sugar