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A DNA template is read 3′ to 5′. The reading frame starts at the first base shown. The first G in the fourth triplet is removed. 3′–TAC GGA AAT GCT CCG TTA–5′ What is the fourth mRNA codon after this deletion? A. AGC B. GAG C. CTC D. GGA
Plant and animal cells use ATP while obtaining energy through different processes. (a) Explain why ATP is suited to transferring energy within cells. (b) Describe how light energy drives ATP formation in a plant cell. (c) Compare and contrast how types of…
A substitution occurs within the template strand of a protein-coding gene. The reading frame starts at the first triplet shown. Sequence | Template DNA, read 3′ to 5′ Original | TAC CTT GGA CGA Mutant | TAC CAT GGA CGA mRNA codon | Amino acid AUG | Methionine…
Researchers disable a gene in a laboratory strain and compare its phenotype with an otherwise similar strain in which the gene remains active. What is the main purpose? A. To ensure that all mutations in the genome are removed B. To manufacture additional…
The diagram shows a ribosome translating mRNA in the indicated direction. What would directly result from blocking the leftmost binding site labelled P? A. RNA polymerase would reverse transcription B. A deacylated tRNA would be unable to leave through its…
Why did the results of the Miller–Urey apparatus support a chemical explanation for the origin of life? A. They showed that bacteria arose repeatedly in the apparatus B. They demonstrated that modern DNA can duplicate without enzymes C. They established that…
A membrane-protein preparation is rapidly frozen so that molecules can be imaged in stable conformations using an electron beam. Which method is being used? A. Fluorescence microscopy of living cells B. Light microscopy with a visible stain C. Cryogenic…
A laboratory uses immunofluorescence to locate a protein in cells. What provides the specificity of the fluorescent signal? A. Visible light converts the target protein into DNA B. A dye binds indiscriminately to all membrane lipids C. A fluorophore is…
Three eukaryotic cells have the features shown. Which classification best fits the observations? Feature | Cell P | Cell Q | Cell R Cell wall | Chitin-containing | Absent | Cellulose-containing Plastids | Absent | Absent | Present Large central vacuole |…
Which event distinguishes lysogenic infection from an immediately lytic infection by a temperate bacteriophage? A. The host supplies no energy to viral processes B. The phage genome becomes a prophage within the host chromosome C. The viral genome is never…