Question

samples viewed on an electron microscope must be placed in a vacuum. therefore, an electron microscope can only be used to examine nonliving samples. images are black and white, but computers are used to add \false color\ to structures. transmission electron microscopes beams of electrons must pass through the sample, so samples of cells and tissues must be sliced extremely thin. images appear flat and two - dimensional. scanning electron microscopes a beam of electrons scans the surface of a specimen, so samples do not have to be cut into thin slices. images appear three - dimensional. prokaryotes and eukaryotes key question how do prokaryotic and eukaryotic cells differ? most cells range from 5 to 50 micrometers in diameter. all cells are surrounded by a thin flexible barrier called the cell membrane (also called the plasma membrane). cells fall into two categories, depending on whether they contain a nucleus. the nucleus (plural: nuclei) is a large membrane - enclosed structure that contains genetic material in the form of dna. eukaryotes (yoo kar ee ohts) are cells that have nuclei. prokaryotes (pro kar ee ohts) are cells that do not have nuclei. prokaryotes prokaryotic cells do not enclose their genetic material within a nucleus. they are generally smaller and simpler than eukaryotic cells. bacteria are prokaryotes. prokaryotes carry out all of the activities associated with living things. prokaryotes were the first photosynthetic organisms on earth. eukaryotes in eukaryotic cells, the nucleus separates the genetic material from the rest of the cell. most eukaryotic cells contain many structures and internal membranes. some eukaryotes are unicellular organisms called protists. others form multicellular organisms—plants, animals, and fungi. in multicellular organisms, cells are specialized and usually work together to perform specific tasks. visual reading tool: prokaryotes and eukaryotes read the section on prokaryotes and eukaryotes to identify the similarities and differences of each cell type. use a green pencil to circle similarities, a blue pencil to circle prokaryotic cell characteristics, and a red pencil to circle eukaryotic cell characteristics. then complete the table below. prokaryotic cell eukaryotic cell cell membrane yes nucleus cell size smaller complexity example of organism with this cell type

Explanation:

The text provides information about transmission and scanning electron microscopes, and then focuses on the differences between prokaryotic and eukaryotic cells. Prokaryotic cells lack a nucleus, are generally smaller and simpler, with bacteria being an example. Eukaryotic cells have a nucleus, can be unicellular (like protists) or multicellular (plants, animals, fungi), and are more complex. The table - filling task requires understanding these characteristics to complete. For the electron - microscopy question, transmission electron microscopy images are flat and two - dimensional as electrons pass through extremely thin samples, while scanning electron microscopy images are three - dimensional as the electron beam scans the specimen surface.

Answer:

• How do the final images of transmission and scanning electron microscopy differ?: Transmission electron microscopy images are flat and two - dimensional; scanning electron microscopy images are three - dimensional.
• Prokaryotic Cell - Cell membrane: yes
• Prokaryotic Cell - Nucleus: no
• Prokaryotic Cell - Cell size: smaller
• Prokaryotic Cell - Complexity: simpler
• Prokaryotic Cell - Example of organism with this cell type: bacteria
• Eukaryotic Cell - Cell membrane: yes
• Eukaryotic Cell - Nucleus: yes
• Eukaryotic Cell - Cell size: larger
• Eukaryotic Cell - Complexity: more complex
• Eukaryotic Cell - Example of organism with this cell type: plants, animals, fungi, protists