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Two wild populations of a sexually reproducing amphibian differ in colour pattern. Which observation most strongly supports classifying them as the same species under the biological species concept? A. They live in neighbouring valleys B. They use the same…
Which combination is typical of many veins carrying blood back from the limbs? A. Valves present; walls relatively thin B. Valves absent; walls thicker than comparable arteries C. Valves present; complete absence of muscle D. Valves absent; walls one…
The graph models the ventilatory response when increased metabolic carbon dioxide lowers blood pH. Which receptor response contributes to the rise in ventilation? A. Thermoreceptors detect a fall in body mass B. Baroreceptors measure oxygen-binding affinity C.…
Which gland–hormone–role combination is correct? A. Pineal gland — melatonin — coordination of daily sleep timing B. Adrenal gland — insulin — lowering blood glucose C. Pancreas — melatonin — initiating sleep D. Pineal gland — adrenaline — increasing cardiac…
Which mechanism coordinates ordinary peristaltic waves along the intestine? A. Conscious contraction controlled by the motor cortex B. Involuntary coordination by the enteric nervous system C. Voluntary coordination by the spinal withdrawal reflex D. Conscious…
Which sequence of events causes normal quiet inspiration? A. Diaphragm relaxation reduces thoracic volume and lowers pressure B. Diaphragm contraction increases thoracic volume and lowers alveolar pressure below atmospheric pressure C. Abdominal compression…
After a person steps on a sharp object, a withdrawal reflex bends the leg. Which component acts as the effector? A. A contracting leg muscle B. A sensory axon from the skin C. A relay neuron in the spinal cord D. A pain receptor in the sole
A bacterial isolate is no longer killed by an antibiotic that inhibited an earlier isolate of the same species. Which biological change could explain the difference? A. A mutation has altered a bacterial target so the drug binds less effectively B. The…
Which mechanism coordinates ordinary peristaltic waves along the intestine? A. Conscious contraction controlled by the motor cortex B. Involuntary coordination by the enteric nervous system C. Voluntary coordination by the spinal withdrawal reflex D. Conscious…
Which cell can provide an innate defence by engulfing microbes without first selecting a clone with a matching antigen receptor? A. A plasma cell secreting one antibody specificity B. A memory B cell C. An activated helper T cell D. A macrophage