An element or molecule that has an essential role in an organism's growth and survival is defined as a(n) ________
a. vitamin
b. ion
c. compound
d. nutrient
d
You might also like to view...
Bacteria are good models to use because they
A. are large in size. B. share many biochemical/physiological properties with more complicated organisms. C. can be assembled into multicellular organisms. D. have complicated growth requirements.
What is the correct ordering in the hierarchal levels of the organization of life, from the least inclusive to the most
inclusive?
a. tissues, cells, population, organisms, and organs b. molecules, cells, organs, tissues, and organisms c. ecosystems, populations, tissues, cells, and organs d. cells, tissues, organs, communities, and populations e. cells, tissues, organs, organisms, and ecosystems
In a two-point test-cross analysis, what are the "two points" being tested?
What will be an ideal response?
Which of the following statements about the loop of Henle is true?
a. The walls of the descending loop are relatively impermeable to water. b. The walls of the descending loop are relatively permeable to sodium. c. The walls of the ascending loop are relatively permeable to water. d. The walls of the ascending loop are relatively permeable to sodium. e. The entire loops is relatively permeable to sodium.