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The graph follows glucose in the filtrate of a healthy nephron. Which process best explains the decrease along the proximal convoluted tubule? A. Glucose is transported from the filtrate and returned to the circulation B. Water enters the filtrate…
A urine test strip is designed to detect the hormone released following early embryo implantation. Which target makes it useful as a pregnancy test? A. Human chorionic gonadotropin B. Progesterone alone C. Oestradiol alone D. Prolactin
The diagram shows a change in skin arterioles following a change in environmental temperature. Which response is likely to accompany it? A. More sweat secreted to the skin surface B. Increased shivering activity in skeletal muscles C. Body hairs lying flatter…
Two insect populations become reproductively isolated because they mate on different host plants within the same woodland. Which feature makes this an example of sympatric rather than allopatric speciation? A. Their descendants will necessarily have identical…
The limb plans below retain corresponding bones despite their different uses. Which kind of evidence for common ancestry do they illustrate? A. Analogy produced only by the same habitat B. Unrelated structures that happen to perform identical functions C.…
The streamlined bodies of a shark and a dolphin evolved in separate vertebrate lineages. Which interpretation is correct? A. A similar aquatic demand has favoured convergent evolution of an analogous overall form B. The dolphin descended directly from the…
A threatened woodland dormouse depends on connected patches of native shrubs. Which action is an in situ conservation measure? A. Maintaining a breeding colony entirely in an overseas zoological collection B. Freezing tissue samples in a laboratory collection…
Which conclusion best matches broad estimates of global species richness through evolutionary history? A. Discovery of new species stopped once genome sequencing became available B. The present contains a very high total diversity, probably exceeding earlier…
Which condition belongs to the environmental requirements of a typical tropical reef-building coral? A. An acidic freshwater lake B. Permanent darkness below the ocean’s lighted zone C. Seawater with an appropriate marine salinity D. Continuous freezing of the…
This simplified diagram positions terrestrial biomes along two increasing climatic variables. What do X and Y represent? A. X: annual temperature; Y: annual precipitation B. X: annual precipitation; Y: annual temperature C. X: soil nitrogen; Y: day length D.…