Which of the following molecules is least likely to cross a cellular membrane by simple diffusion?
a. carbon dioxide
b. nitrogen
c. oxygen
d. potassium ion
e. water
D
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The figures above represent three hypothetical populations; each circle is an organism. Write the letter of the pattern that you would expect to find. Individuals establish exclusive territories to secure access to resources
A. A B. B C. C
Phil is conducting a seed germination experiment. He places 3 groups of lettuce seeds in a 34º Celsius incubator with adequate moisture. One set of seeds is placed in a dark area with no light source. A second set is placed under artificial light and third set of seeds is placed in direct sunlight. This experiment is intended to test Phil's hypothesis that light is necessary for lettuce seed germination.Based on the experimental design, which variable was the control?
A. Moisture B. Temperature C. Seeds in the dark D. Type of light E. Germination rate
The tetracyclines interfere with
A. protein synthesis. B. cell wall synthesis. C. cell membrane component synthesis. D. nucleic acid synthesis. E. folic acid synthesis.
Flowering plants rose to dominance in part because they __________ with animal pollinators. Fill in the blank(s) with the appropriate word(s)