You are tracking the inheritance of a genetic disorder through a family's pedigree, and you notice that it shows up in every generation. The disorder is most likely:
A) X-linked recessive. B) recessive. C) dominant.
Answer: C
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Which of the following statements about muscle contraction is false?
A. Actin and myosin filaments shorten during muscle contraction. B. Sarcomere length is variable in invertebrates, but uniform in vertebrates. C. Longer sarcomeres allow for a greater degree of shortening. D. Actin and myosin filaments overlap more when a muscle is contracted than when it is relaxed. E. Rapidly contracting muscles express myosin molecules that have higher rates of ATP hydrolysis.
Under what environmental conditions would it be MOST advantageous for the photoautotrophic dinoflagellate Peridinium limbatum to reproduce asexually?
A. Increasing concentrations of nitrogen and phosphorus caused by fertilizer runoff B. Fluctuating seasonal water temperatures C. Increasing water acidity levels caused by rising concentrations of atmospheric carbon dioxide D. Decreasing light availability caused by an increase in suspended particles
Compared with plants growing in shade, plants growing in sunlight tend to have smaller
A) stems. B) roots. C) leaves. D) flowers.
Each of the following contributes to the unidirectional propagation of nerve signals except
A) dendrites only receive signals. B) presynaptic neurotransmitter secretion is separated from postsynaptic receptors. C) neuron membranes have a refractory period following generation of an action potential. D) ion channels are oriented to transport ions only into the neuron. E) action potentials initiate the hillock and propagate only down the axon.