Meteorites seem to be primarily composed of material very similar to the material in asteroids
a. True
b. False
Indicate whether the statement is true or false
True
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Large external polysaccharides are degraded by bacteria and archaea using ________ ________, which they secrete outside the cell.
Fill in the blank(s) with the appropriate word(s).
Jacob, Monod, and Pardee constructed a mutant strain of E. coli that carried a lacI-gene mutation (encodes the lac repressor). Which is TRUE of this mutant strain?
A. Transcription of the lac operon is repressed. B. Transcription of the lac operon does not change. C. The lac operon is constitutively expressed. D. Nonfunctional proteins are produced. E. The lac operon is constitutively expressed and nonfunctional proteins are produced.
Which is not true of cadherin proteins?
A. They are cell adhesion molecules. B. An endodermal cadherin can only bind to an endodermal cadherin. C. They maintain the different germ cell layers. D. They establish morphogenic fields. E. They ensure that certain cells will move together.
In animals ________ is the sugar-storage equivalent of starch in plants
a. glucose b. sucrose c. glycogen d. cellulose e. chitin