What is a codon?

• A single nucleotide in DNA

• A sequence of 3 nucleotides which code for a specific amino acid

• A protein found in the nucleus

• An enzyme that synthesizes DNA

Tags

NGSS.HS-LS1-6

Which of the following is NOT a stop codon?

• UAA

• UGA

• AUG

• UAG

Where does transcription occur in a eukaryotic cell?

• Cytoplasm

• Nucleus

• Ribosome

• Mitochondria

Which base is found in mRNA but not in DNA?

• Thymine

• Uracil

• Adenine

• Guanine

Where does translation occur?

• Nucleus

• Ribosome

• Mitochondria

• Golgi apparatus

What is the role of DNA in protein synthesis?

• It transports amino acids

• It provides the code to make specific proteins

• It forms ribosomes

• It breaks down proteins

Tags

NGSS.HS-LS1-1

What chemicals make up the backbone of the DNA molecule?

• Ribose and phosphate

• Deoxyribose and phosphate

• Nitrogen bases and ribose

• Deoxyribose and nitrogen bases

Which chemical makes up the rungs of the DNA ladder?

• Deoxyribose

• Phosphate

• Nitrogen bases

• Ribose

Which of the following is NOT a nitrogen base found in DNA?

• Adenine

• Cytosine

• Uracil

• Thymine

Which nitrogen base always pairs with guanine in DNA?

• Adenine

• Thymine

• Cytosine

• Uracil