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The arrow at X represents outward bulk movement of fluid and small dissolved substances through the capillary wall. What drives this filtration? A. The absence of all dissolved substances from blood plasma B. A greater hydrostatic pressure within the capillary…
Local networks within the gut wall coordinate waves of smooth-muscle contraction even without conscious instructions. Which nervous-system component provides this local control? A. The retinal sensory network B. Motor pathways to skeletal muscle only C. The…
Which cell contributes directly to innate defence by engulfing invading bacteria? A. An antibody-secreting plasma cell B. A memory B lymphocyte C. A neutrophil D. An antigen-specific cytotoxic T cell
After body temperature rises above the regulated range, which response and feedback classification are appropriate? A. Negative feedback: increased skin blood flow promotes heat loss B. Positive feedback: shivering reduces heat production C. Negative feedback:…
In a model insect, females are XX and males XO. A normal-looking male carries a newly induced recessive allele on his X in the germ line. He mates with a female homozygous for the normal allele. F1 females then mate with normal XO males. In which listed group…
A beetle lineage colonizes an archipelago. Which explanation is consistent with the rise in species richness shown? A. Individuals stop competing, so population growth alone creates new species B. Different available niches favour divergence and adaptive…
A chromosome-doubled population of a flowering plant arises beside its diploid relatives. Which observation provides the strongest evidence of a new species? A. The doubled plants grow taller only when fertilizer is added B. One doubled plant reproduces by…
A bacterium grows using aerobic respiration when oxygen is present but can also generate ATP and grow when oxygen is absent. Which classification applies? A. Facultative anaerobe B. Obligate aerobe C. Obligate anaerobe D. Organism incapable of metabolism
Which feature can be shared by an animal with holozoic nutrition and a saprotrophic fungus? A. Both always ingest solid food into digestive cavities B. Both obtain all carbon by fixing carbon dioxide C. Both digest food exclusively within individual lysosomes…
Four model aquatic invertebrates feed on the same suspended food. Their preferred temperature ranges are shown. Which conclusions about this niche dimension are justified? Species | Preferred temperature / °C W | 14–17 X | 12–25 Y | 17–21 Z | 20–29 I. All four…