Diffusion during which the substance to be transported binds selectively to a membrane-spanning protein, which helps the process along, is called ________.
a) simple diffusion
b) active transport
c) facilitated diffusion
d)facilitated osmosis
e) osmosis
Ans: c) facilitated diffusion
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In which order were the key features of complex multicellularity likely to have appeared?
A. cell adhesion, cell communication, regulated growth and development B. cell communication, cell adhesion, regulated growth and development C. regulated growth and development, cell communication, cell adhesion D. regulated growth and development, cell adhesion, cell communication
The above figure represents __________, a group of
parasitic fungi that are killing amphibians around the world. a. Chytrids b. Ascomycetes c. Basidiomycetes d. Glomeromycetes e. Zygomycetes
Which of the following is a coenzyme?
A) zinc B) vitamin B6 C) iron D) iodine
Future kidney cells and heart cells can differentiate into their respective specialized cell types because
A. they possess different genes. B. they utilize different transcription factors. C. they express different genes and utilize different transcription factors during development. D. they express a different set of genes during development. E. they arise from different embryonic stem cells.