Describe the musculature of the gastrointestinal tract
What will be an ideal response?
In most parts of the GI tract, there are two layers of smooth muscle composing the walls of the tube; circular and longitudinal. Both aid in churning and peristalsis. The stomach, however, has 3 layers to allow for more complex churning and mixing. A good example of structure/function relationship.
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What phenomenon would violate the conditions for Hardy-Weinberg equilibrium?
A. The population is isolated from other populations. B. Females select males based on secondary sex traits. C. The population is large. D. No genotypes within the population have a reproductive advantage. E. Genetic drift within the population does not change allele frequencies.
Which of these is not a possible function of trichomes?
A. reflect light from leaf surfaces B. store or secrete salt C. defend against insects D. structural support E. irritate potential herbivores
Which of the following is used as an electron carrier by living organisms?
A. NADP+ B. Ubiquinone C. NAD+ D. All of the choices are correct.
The single long process that extends from a typical
motor neuron is the a. axon. b. neuron. c. synapse. d. dendrite. e. cell body.