Fibroblast cells are a good model system for studying muscle differentiation because
A. they are totipotent.
B. they never differentiate into muscle cells in a normally developing animal.
C. they can differentiate into muscle cells in a normally developing animal.
D. they express a limited number of genes.
E. they have a small genome.
B. they never differentiate into muscle cells in a normally developing animal.
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During inhalation,
a. the pressure in the thoracic cavity is greater than the pressure within the lungs. b. the pressure in the pleural sac is less than the pressure within the lungs. c. the diaphragm moves upward and becomes more curved. d. the chest cavity volume decreases. e. movement of the diaphragm is inhibited
Which one of the following is NOT directly involved in the production of a typical spinal reflex?
A) brain B) sensory neuron C) motor neuron D) interneuron E) stimulus
The cow Bos primigenius (which is bred for meat and milk) has a smaller brain and larger eyes than closely related wild species of ungulates. These traits most likely arose by _____
A) natural selection, because these traits evolved in the population over time B) natural selection, because these traits were not consciously selected by humans C) artificial selection, because changes in these traits co-occurred with human selection for high milk output and high muscle content D) artificial selection, because these animals differ from their close relatives and common ancestor
The destruction of (cysts/endospores/viruses) is the goal of industrial canning procedures.
Fill in the blank(s) with the appropriate word(s).