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For this ordinary temperate plant, assume the optimum is above26°C and below45°C. Other factors remain suitable. Which extension towards70°C is most plausible? A. The rate increases without limit B. The rate immediately falls to zero at27°C and then rises C.…
Define an autotroph.
Describe the role of decomposers.
Suggest why energy-transfer efficiencies differ among food chains.
Suggest how expansion of cattle farming can affect global climate.
Which row demonstrates degeneracy of the genetic code? Row | mRNA codons | Encoded amino acids P | AAA GCU AAA | Lys–Ala–Lys Q | AUG UGG GAA | Met–Trp–Glu R | UCU GGA UCC | Ser–Gly–Ser S | UAC GAC AAC | Tyr–Asp–Asn A. P B. Q C. R D. S
Feedback regulates physiological variables. (a) Discuss positive and negative feedback in variable control. (b) Describe the regulation of human blood glucose. (c) Explain responses expected when blood pH falls below its usual range. One additional mark is…
What consequence follows from several codons specifying the same amino acid? A. Every codon specifies several amino acids B. Every substitution destroys a protein C. A ribosome can translate a codon without tRNA D. Some substitutions leave the amino-acid…
Nectar-feeding insects depend on flowering plants and can influence their evolution. (a) Outline links between the properties of glucose and its uses. (b) List human activities that threaten insect pollinators. (c) Explain how natural selection can produce…
In which cell could a new mutation be transmitted directly to a child through fertilization? A. A sperm cell B. A liver cell C. A mature skin cell D. A pancreatic beta cell