RNA catalysis was discovered by Thomas Cech and his coworkers when the experimental control tube with only RNA and no protein showed enzymatic activity. This discovery would most likely be described as:

A. model building and calculation.
B. exploration and observation
C. inspiration.
D. serendipity.


D

Biology & Microbiology

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The site of new primary growth at the apex of a shoot is the

a. terminal bud. b. internode. c. axil. d. lateral bud. e. node.

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_____ are an example of seedless vascular plants.

a) Pine trees b) Mosses c) Charophyceans d) Ferns e) Lilacs

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A recombinant cell

1)is a cell that receives DNA from an outside source and incorporates it into its own. 2).donates DNA into a new cell. 3).is the result of a cell dividing.

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