The single gene mutation associated with DMD leads to various symptoms that include bone
growth, muscles, and behaviors. This is an example of __________.
a. a polygenic trait
b. pleiotropy
c. gene manipulation
d. codominance
B
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Which system(s) control digestion?
a. the nervous system b. the endocrine system c. both the nervous and endocrine systems d. the lymphatic system e. both the nervous and lymphatic systems
How do beavers maintain a landscape?
A) massive defoliation of shrubs B) feeding on roots of graminoid plants C) feeding on aspen, willow, and birch trees D) dispersing seeds of mesquite
A DNA fingerprint of a suspect doesn't match a DNA fingerprint from a blood sample taken at a crime scene. What can you conclude?
A) The suspect was never at the crime scene. B) The blood sample was probably degraded or destroyed in some way. C) There is no DNA in a blood sample. D) The blood came from a different person, but the suspect may have been there.
Which of the following accounts for the fluid aspect of the fluid mosaic model of plasma membranes?
A) The individual phospholipid molecules are not bonded to one another, so the movement of certain proteins and lipids is possible within and through the bilayer. B) The plasma membrane is "fluid" because of the movement of substances across the membrane. C) One of the components of the membrane is water. D) The membrane is water soluble. E) The bilayer permits diffusion of certain lipid-soluble substances.