High School Biology : Genes and DNA
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Example Questions
Example Question #1 : Understanding Gene Regulation
Which of the following best describes the interaction between tRNA and mRNA during protein synthesis?
mRNA anti-codons directly bind tRNA codons to form a chain of amino acids. Once all amino acids are joined, mRNA and tRNA are degraded.
tRNA semi-randomly adds amino acids to the ribosome, and the ribosome sorts them later by binding mRNA codons and building the correct protein chain sequence.
mRNA provides the code for the proper amino acid chain order and the ribosome creates the links in the chain (peptide bonds). tRNA is then responsible for folding the chain to give a protein its 3-dimensional structure.
mRNA does not interact with tRNA because mRNA is a nucleic acid that is only utilized during transcription.
tRNA anti-codons are matched to the mRNA codons during translation in the ribosome to build the correct protein. tRNA molecules carry the amino acids to the ribosome in the correct order as prescribed by the mRNA transcript.
tRNA anti-codons are matched to the mRNA codons during translation in the ribosome to build the correct protein. tRNA molecules carry the amino acids to the ribosome in the correct order as prescribed by the mRNA transcript.
The ribosome is where translation happens, but it requires both mRNA and tRNA. mRNA provides the "recipe" for the order of the amino acids in its codons, each of which corresponds to a specific amino acid in the chain, and the tRNA molecules come in and bind appropriately when their anti-codons are complementary to the mRNA codons. tRNA molecules carry the amino acids to the ribosome, where the actual protein chain is then synthesized.
Example Question #132 : Genetics And Evolution
What type of protein binds to the the regulatory region of genes in eukaryotic cells to regulate gene expression?
Transcription factors
Tyrosine recombinases
TATA-box binding protein
RNA polymerase
Transcription factors
Transcription factors are proteins that bind to the regulator region of genes in eukaryotes and regulate whether a gene is expressed or not. A TATA-box binding protein is recruited after the transcription factors bind to the regulator region, and it eventually recruits RNA polymease. Tyrosine recombinases are not involved in initating eukaryotic gene expression.
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