Exposure of which of the following regions of a molecule of DNA permits the reading of DNA sequence without opening the double helix?
A) phosphate groups
B) phosphodiester bonds
C) major groove
D) minor groove
C) major groove
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The range of conditions and resources required by a population is known as its ____, while the range of conditions and
resources that it actually uses is known as its ____.
a. fundamental niche; habitat b. trophic level; habitat c. realized niche; fundamental niche d. fundamental niche; realized niche e. ecological niche; trophic level
Two species cannot occupy the same niche because of which of the following?
a. communalistic principle b. endosymbiotic principle c. competitive exclusion principle d. intraspecific competition principle
To meet the high oxygen demands of flight, birds _____
a. use simple lungs b. use air sacs connected to their lungs c. use carbon dioxide for respiration d. can diffuse oxygen through their skin e. use simple lungs, and can diffuse oxygen through their skin
____ is a passive transport plasma membrane protein that forms a pore through which water (but not solutes) can flow freely across the membrane.
A. ADH B. A sodium ion C. Ketone bodies D. Aquaporin E. Angiotensinogen