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In transmission electron microscopy, objects are imaged by their differences in _______ density.

Scanning electron microscopy is usually used for a three-dimensional view of the surface of cells.

In velocity gradient centrifugation, how are particles separated during centrifugation?

Caenorhabditis elegans is an important organism for the study of plant development.

Proteins move from the __________to the _________ during protein trafficking.

Similarities in basic metabolic mechanisms indicate that all present-day cells on Earth descended from a single primordial ancestor.

The genome of eukaryotes consists of genes derived from

The feature that most clearly separates eukaryotes from prokaryotes is the presence of _______ in eukaryotic cells.

Which aspect of C. elegans biology makes it particularly useful for studying development and differentiation?

The frog Xenopus laevis is useful for studying early development because its eggs are small and clear.