DNA Replication and Transcription Quiz

Which of the following events occurs in transcription as well as in replication of DNA?

• Free nucleotides bond to the DNA strand.

• Two new DNA molecules are produced.

• Uracil nucleotides bond to adenine on the DNA strand.

• Only part of the DNA molecule containing a gene unwinds.

The following diagram shows the structure of a tRNA molecule. Which letter A, B, C or D, indicates the position on the molecule where the amino acid would be attached?

Evaluate responses using AI:

OFF

Which of the following represents the sequence of amino acids in the polypeptide chain from the DNA strand?

• Serine -Lysine -Histidine -Phenylalanine -Glycine -Tyrosine

• Serine -Phenylalanine -Alanine - Lysine -Histidine -Tyrosine

• Tyrosine -Glycine -Phenylalanine -Histidine -Lysine -Serine

• Tyrosine -Histidine -Lysine -Alanine -Phenylalanine -Serine

Which of the following BEST explain why DNA replication is important in maintaining genetic stability?

• I. DNA has to replicate accurately to allow offspring to inherit genes from parents.

• II. When new cells are made, each must receive two exact copies of the instructions to function properly.

• III. DNA must be replicated for cell division to produce cells that function efficiently.

• I, II and III

Which of the following is NOT a feature of the genetic code?

• Similar amino acids may have similar codons.

• A triplet of bases codes for one amino acid in a polypeptide chain.

• One amino acid may be coded for by more than one codon.

• Each species has its own set of unique triplet codes

give a concise description of the events occuring at the steps labelled 1,2 and 3 in the diagram (6 marks)

Evaluate responses using AI:

OFF

One role of transfer RNA in protein synthesis is to

• Deliver amino acids to ribosomes

• Terminate the elongation of the polypeptide chain

• Acts as a supporting framework for polypeptide chains

• Carry protein-building instructions from DNA in the cytoplasm

What is the primary function of ribosomal RNA in protein synthesis?

• To transport amino acids to the ribosome

• To catalyze the formation of peptide bonds

• To carry genetic information from DNA

• To provide a site for protein synthesis

Which of the following statements about codons is TRUE?

• Codons are found in the mRNA sequence.

• Each codon consists of four nucleotides.

• Codons are identical in all organisms.

• Each codon codes for multiple amino acids.

During which phase of the cell cycle does DNA replication occur?

• M phase

• G2 phase

• S phase

• G1 phase