Which of the following is a feature of the nematode nervous system?
a. a true brain with two hemispheres
b. spinal cord
c. pharyngeal nerve ring
d. partial meninges
c. pharyngeal nerve ring
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Why don't hormones build up in the body over time?
A. They are secreted from the body by exocrine glands. B. They are filtered out of the blood by lymph tissues. C. They do, but target tissues become desensitized over time. D. They are degraded by enzymes in the target tissue.
While the maximum number of electrons required to fill the outermost shell of an atom varies depending on the size of the atom, almost all of the smaller atoms (atomic numbers 2-20 ) are considered stable (nonreactive) when they contain ________
electron(s) in the outermost shell. A) 1 B) 2 C) 8 D) 16
Which statement is false about complex IV?
A) A binuclear center that contains an iron ion and heme-a3 is the site of the reduction of molecular oxygen to water. B) Bacterial and eukaryotic forms of complex IV have very similar structures and number of subunits per functional unit. C) The core structure of the cytochrome c oxidase in complex IV has three conserved subunits. D) Copper ions shift from a +2 oxidation state to a +1 oxidation state as electrons are passed through the complex.
Thinking of the examples in your book of adaptive radiation, in which of the following environments might you be most likely to find adaptive radiation?
A) in earthworms feeding on detritus B) among insects that are generalist feeders C) in fruit flies that feed on different yeast strains specific to different species of cacti in the desert D) among houseflies living in a garbage dump