A soluble protein or glycoprotein released by one cell population to signal between cells is called
A) An enzyme
B) A cytokine
C) A hormone
D) None of the above
Ans: B) A cytokine
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Which of the following is not affected by the presence of epigenetic marks?
A. development B. imprinting C. X chromosome inactivation D. maturation of RNA E. unique expression patterns in different cells
Terrestrial organisms lose water through evaporation. In what ecosystem might an entomologist find a good study organism to examine the prevention of water loss?
A) wet rain forest B) desert C) prairie D) chaparral
During photosynthesis, solar energy is converted to
What will be an ideal response?
Why aren't viruses considered living organisms?
A. because they lack the metabolic machinery to acquire and use nutrients B. because they are not composed of cells C. because they do not possess genetic material D. because they do not replicate E. None of these are correct.