Which of the following were part of the experiments of Hershey and Chase?

A) Mice were injected with type R bacteria and developed pneumonia.

B) Mice were injected with type S bacteria and developed pneumonia.

C) DNA isolated from type S bacteria killed by heating transformed type R bacteria.

D) E. coli bacteria were infected with virus labeled with radioactive phosphorus.


D) E. coli bacteria were infected with virus labeled with radioactive phosphorus.

Biology & Microbiology

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What is the difference between an estuary and a salt marsh?

a. Salt marshes are found far from the ocean, while estuaries border the ocean. b. Salt marshes are not affected by tides, while estuaries are. c. Salt marshes are dominated by grasses, while estuaries are defined by tidal influence. d. Salt marshes border the ocean, while estuaries exist in river environments. e. Salt marshes are affected by tides, while estuaries are not.

Biology & Microbiology

__________ are multicelled heterotrophs with

unwalled cells. Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

The ___________ is the gel-like material plus the cell's organelles

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

In his 1771 experiments, Joseph Priestly determined that plants added something to the air that allow an animal to survive.  What do we now know that plants contribute to the air that is essential for animals (and other organisms)?

A. oxygen B. water C. organic sugars D. carbon dioxide

Biology & Microbiology