Which observation proves that a cell is a eukaryote? A. It has ribosomes inside the cell. B. It is surrounded by a cell membrane. C. It has enclosed organelles inside the cell. D. It has DNA in the cell.

Which of these is true of the cytoplasm of an unfertilized egg? a. it is an unevenly distributed mixture of mrna, proteins, organelles, and other substances. b. it does not contain substances that are important in directing development. c. these substances are supplied by the sperm. d. it does not contain substances that are important in directing development. e. development is directed solely by the surrounding cells. f. it is a homogeneous mixture of mrna, proteins, organelles, and other substances. g. it does not contain substances that are important in directing development. h. these substances are produced by the dna of the fertilized zygote.

What is an example of a scientific question that galileo could not have answered with out this new tool?

What is the major difference between a virus and a viroid?