Guidelines for the assignment of sex for an individual include
A. karyotype results.
B. the presence of ovaries or testes.
C. the presence of penis or clitoris.
D. karyotype results and the presence of ovaries or testes.
E. the presence of ovaries or testes and the presence of a penis or clitoris.
D
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Osmosis is the diffusion of water across a membrane in response to the concentration of one or more of the ______.
A. solutes B. membranes C. compartments D. cells
In your biology lab, you use a stereoscopic microscope to observe a living animal that uses only one opening to both take in its food and eject its waste products. What is the body arrangement of this animal?
A. gastrovascular cavity B. incomplete digestive tract C. complete digestive tract D. complete digestive tract and a gastrovascular cavity E. incomplete digestive tract and a gastrovascular cavity
How does a sarcomere shorten using the sliding filament mechanism of muscle contraction?
A) Actin and myosin filaments shorten and slide past each other. B) As they slide past each other, actin filaments shorten, while myosin filaments do not shorten. C) Actin and myosin filaments do not shorten, but they do slide past each other. D) As they slide past each other, myosin filaments shorten, while actin filaments do not shorten.
A neuron and a nerve differ in that
A. nerves are bundles of fibers and neurons are single cells. B. neurons carry impulses and nerves do not. C. neurons are found in the peripheral nervous system only. D. nerves are attached to neurons.