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Identical red blood cells were placed in solutions P–S. Which conclusion is supported by their model appearances? A. Q is more dilute than P B. S has a higher effective solute concentration than Q C. R is more concentrated than S D. P is more dilute than S
Which process commonly partitions cytoplasm unequally between a parent cell and its offspring? A. Fusion of two gametes B. Binary fission into similar bacterial cells C. Budding in yeast D. Symmetric mitotic division of a lymphocyte
The names of four mammals are shown. Which pair belongs to the same genus? P: Panthera pardus Q: Neofelis nebulosa R: Panthera onca S: Leopardus pardalis A. P and R B. Q and S C. P and S D. R and S
Under the biological species concept, which observation is decisive for membership of one species? I. Occupying the same habitat II. Looking similar III. Interbreeding to produce fertile offspring A. I, II and III are all required B. I and II C. III only D. II…
Which property helps blood flow through a vein when surrounding skeletal muscle contracts? A. A very rigid non-compressible wall B. A flexible wall that can be compressed C. A wall consisting only of a single fenestrated layer D. A lumen always narrower than…
What acts as the receptor in a withdrawal reflex initiated by a sharp object? A. The contracting arm muscle B. The pituitary gland C. A motor neuron terminal D. A sensory nerve ending in the skin
Which event initiates a specific antibody-producing response? A. Activation of a matching B cell by antigen and helper-T-cell signals B. Conversion of fibrinogen into fibrin C. Contraction of a skeletal muscle D. Release of hydrochloric acid in the stomach
What is a major role of a helper T lymphocyte during an adaptive immune response? A. Activating other immune cells through signalling B. Secreting the bulk of circulating antibody directly C. Engulfing every extracellular pathogen by phagocytosis D. Producing…
In a withdrawal reflex, where would a sensory neuron synapse with a relay neuron in the spinal cord? A. Q B. S C. P D. R
A public-health text classifies rabies as a zoonosis. What does this classification mean? A. It can pass from a non-human animal reservoir to humans B. It can occur only in a zoo C. It is necessarily transmitted only between humans D. It consists of animal…