The accompanying figure shows a cross-section through the vascular cylinder of a(n) ____
a. monocot stem
b. eudicot stem
c. monocot root
d. eudicot root
e. eudicot leaf vein
ANSWER: a
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During every energy transformation, it can be said that ____
a. the entropy of the universe increases b. the entropy of the universe decreases c. there is an increase in the free energy of the universe d. there is a change in the total energy of the universe e. the system becomes more organized
Which of the following is an example of antiport?
-simultaneous movement of an amino acid and protons into the cell -simultaneous movement of an amino acid and protons out of the cell -coupling of the inward movement of water with the outward movement of protons -coupling of the inward movement of Na+ with the outward movement of Ca++ -none of the choices are correct.
In a parasitic relationship where the host contracts a disease and sometimes dies, the parasite is called a(n):
a. predator. b. keystone species. c. mutualistic symbiont. d. interspecific competitor. e. pathogen.
Why do things appear mainly black or white to us in low light?
A) Rods are more sensitive to light than are cones. B) Colored light does not strike the retina in low light. C) Only white light is available at night. D) Few action potentials are generated in low light. E) The diffused light of night does not fall on the fovea.