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These tRNAs carry the amino acids shown. Which mRNA sequence encodes the tripeptide phenylalanine–glycine–lysine? Anticodon, written 3′→5′ | Amino acid AAG | Phenylalanine CCA | Glycine UUC | Lysine A. 5′–AAG CCA UUC–3′ B. 5′–TTC GGT AAG–3′ C. 5′–UUC GGU…
A crop line is resistant to a herbicide used against weeds in the same field. Outline one benefit of cultivating the resistant crop.
In a model region, cultivation of herbicide-resistant crops expanded during the period shown. The chart records the cumulative number of weed species reported resistant to that herbicide. Comment on environmental consequences of widespread use of these crops.
State the effect of raising fish density on FCR.
Evaluate recirculating tanks rather than flow-through tanks for fish grown at high density.
Water, sediment and material scraped from rock biofilms are sampled at two river locations. E. coli is a faecal bacterium. Standardized sample preparations are compared, with variability shown by error bars. (i) Suggest a reason for the difference between the…
When human skeletal muscle relies more heavily on anaerobic respiration, which outcome is expected? A. A modest rapid ATP supply with lactate formation B. A greater ATP yield per glucose than complete aerobic oxidation C. Ethanol and oxygen as the main…
Describe the overall pattern in the species counts.
Describe a method for measuring herbaceous-plant diversity at different distances from a road within a green space.
A green leaf receives only a narrow band of blue light centred near 445 nm. Which plot could show the photosynthesis supported by the wavelengths actually supplied? A. Plot A B. Plot B C. Plot C D. Plot D