Quiz 6: Topic EXPRESSION OF BIOLOGICAL INFO - Genies

A particular triplet of bases in the template strand of DNA is AGT. The corresponding codon for the mRNA transcribed is ...

• AGT

• UGA

• TCA

• UCA

Which of these CORRECTLY illustrates the pairing of DNA and RNA nucleotides?

• GTTACG with CAATCG

• GTTACG with CAAUGC

• GTTACG with GTTACG

• GTTACG with ACCGTA

How is the four-letter language of nucleic acids converted into the 20-word language of amino acids?

• The 4 nucleic acid bases combine in 2-letter combinations that define different amino acids.

• The 4 nucleic acid bases combine in 3-letter sequences that define different amino acids.

• Triplets of the 2-letter nucleic acid bases are translated into the 20 different amino acids.

• The 4 bases each specify 1 amino acid, which give rise to the remaining 16 amino acids.

Why is ONLY ONE strand of DNA transcribed into mRNA?

• Because mRNA is only required in small quantities.

• Because transcribing both DNA strands would produce different amino acid sequences.

• Because the other strand would produce the same amino acid sequence in reverse order.

• Because all genes are located on the same DNA strand, while the other strand acts as protection.

RNA polymerase moves along the template strand of DNA in the ________ direction, and adds nucleotides to the ________ end of the growing transcript.

• 3' to 5'; 5'

• 3' to 5'; 3'

• 5' to 3'; 5'

• 5' to 3'; 3'

What amino acid sequence will be generated, based on the following mRNA codon sequence?

5' AUG-UCU-UCG-UUA-UCC-UUG 3’

• met-arg-glu-arg-glu-arg

• met-glu-arg-arg-gln-leu

• met-ser-leu-ser-leu-ser

• met-ser-ser-leu-ser-leu

A codon

• consists of two nucleotides.

• may code for the same amino acid as another codon.

• consists of discrete amino acid regions.

• catalyzes RNA synthesis.

Translation occurs in

• the cytoplasm.

• a lysosome.

• the nucleus.

• a mitochondrion.

RNA synthesis is also known as:

• elongation.

• reverse transcription.

• translation.

• transcription.

Uracil forms a complementary pair with __________ in RNA and ___________ in DNA.

• adenine; adenine

• adenine; thymine

• thymine; thymine

• uracil; adenine