Which part of the cell theory is supported by what is shown in this illustration?

A) All organisms are composed of one or more cells.
B) All cells arise from existing cells.
C) Any cell in an organism can turn into a different type of cell.
D) All cells have a similar structure.


Ans: B) All cells arise from existing cells.

Biology & Microbiology

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Competent cells are those used in studies of conjugation

Indicate whether the statement is true or false

Biology & Microbiology

How do epithelial cells obtain their nutrients? a. Direct blood supply from an artery

b. Nutrients are delivered by macrophages. c. Direct blood supply from a vein. d. Diffusion from adjacent cells. e. Osmosis of nutrients from underlying tissue.

Biology & Microbiology

While foraging on grass, white-tailed deer occasionally ingest snails or slugs that host larvae of the meningeal worm. The worm larvae mature inside the deer and eventually are passed out with the feces

The snails acquire the larvae as they come into contact with deer feces on the ground. The snails are an example of a(n) A) intermediate host. B) direct host. C) definitive host. D) macrohost.

Biology & Microbiology

Which of the following explains the movement of nutrients into a plant's roots at the end of the growing season?

A. active transport B. pressure-flow system C. transpiration D. osmosis

Biology & Microbiology