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Which outcome is consistent with the developmental potential of an embryonic pluripotent stem cell? A. It can form only one already specialized blood-cell type B. It must make an entire placenta as well as every embryonic tissue C. It can generate many…
How does an axon maintain the ion gradients needed for its resting potential? A. ATP-driven pumps transport sodium outward and potassium inward B. Every sodium and potassium ion diffuses outward until none remains C. ATP pumps both sodium and potassium inward…
An action potential reaches a chemical synapse. Which immediate ion movement follows depolarization of the presynaptic membrane? A. Calcium enters through voltage-gated channels B. Calcium is expelled through newly opened channels C. Chloride is permanently…
The schematic cross-section shows axons surrounded by concentric membrane layers. What function is associated with structure X? A. It provides insulation that permits faster impulse conduction along the axon B. It synthesizes neurotransmitter receptors in…
Which observation supports the identification of a dividing cell as entering mitotic metaphase? A. Homologous chromosomes form paired bivalents B. Sister chromatids have already reached opposite poles C. Spindle microtubules position chromosomes towards the…
A developing animal cell divides its cytoplasm very unevenly, leaving almost all of it in one product. Which process normally includes this pattern? A. Production of two equivalent daughter skin cells B. Binary fission of an intestinal bacterium C. Formation…
Which event is shared by mitotic and meiotic nuclear division? A. Homologous chromosomes must pair as bivalents in both B. The chromosome number is halved in both C. Chromatin becomes more condensed through DNA packaging with histones D. DNA is replicated…
A survey records Betula pendula, Quercus robur, Betula pubescens and Quercus petraea. What can be deduced from these names? A. All four plants belong to one species B. Betula pendula and Betula pubescens share a genus C. Quercus robur and Betula pendula share…
A red fox (Vulpes vulpes) and a European rabbit (Oryctolagus cuniculus) occupy the same meadow. Which grouping necessarily includes both organisms there? A. One species B. One population C. One genus D. One ecological community
The binomial name of the grey wolf is Canis lupus. Which part names its genus? A. Canis B. lupus C. Mammalia D. The complete two-word name alone