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An enzyme converts substrate S into product. Two molecules, P and Q, resemble the binding features of S and compete for its active site. At the same substrate concentration, P requires a concentration of 8 mmol L⁻¹ to halve the rate, while Q requires 0.04 mmol…
The space between the outer and inner mitochondrial membranes has a small volume. How does this assist oxidative phosphorylation? A. It allows electrons to accumulate as a dissolved nutrient B. It permits a proton concentration difference to develop with fewer…
Which conversion is part of the Calvin cycle? A. Triose phosphate is oxidised directly to oxygen B. Glycerate 3-phosphate is reduced to triose phosphate C. Ribulose bisphosphate is produced by splitting water D. Carbon dioxide is formed by oxidation of…
A water-filled potometer estimates water uptake by tracking a bubble in a capillary. To compare uptake rates of two leafy plant species, which variables should be kept the same? I. Total exposed leaf area. II. Air temperature. III. The decorative colour of the…
A nectar-feeding bat carries pollen between flowers of the same species. Why can the interaction be mutualistic? A. The bat receives food while pollen transfer supports plant reproduction B. Only the bat gains and the plant always dies C. The bat supplies the…
Two unlinked loci determine seed colour and surface texture, with complete dominance at each locus. Which cross can produce four phenotypes in equal expected proportions? A. RrTt × rrtt B. RRTT × rrtt C. RrTt × RrTt D. rrTT × RRtt
Two insect populations use different courtship signals and rarely mate in nature. Laboratory pairing can produce fertile hybrid offspring. Which interpretation is justified? A. The populations have no barrier to mating in nature B. Behavioural isolation can…
Which process is shared by typical human spermatogenesis and oogenesis? A. Each meiotic precursor ultimately forms four equal-sized functional gametes B. Each begins with a population of germline precursor cells increased by mitosis C. Each pauses at prophase…