________ are tiny chambers within the lungs that allow for gas exchange
Fill in the blank(s) with correct word
Alveoli
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Foods that have been unacceptably altered due to uncontrolled bacterial growth are called
A. refrigerated. B. spoiled. C. preserved. D. fermented.
Using a specific chemical, a cell biologist has blocked one type of channel-linked receptor in a lab rat's liver tissue. What was the likely mechanism of the chemical she used?
A. The chemical prohibits binding of a ligand to the receptor. B. The chemical prohibits ions from entering the cell via active transport. C. The chemical causes ions to move in the opposite direction of the ion gradient. D. The chemical prohibits second messenger signaling.
Coral mucus is used by reef dwellers as a food source
Indicate whether the statement is true or false
Which of the following statements about the lac operon is not true?
a. When the inducer binds to the repressor, the repressor can no longer bind to the operator. b. When the inducer binds to the operator, transcription is stimulated. c. When the repressor binds to the operator, transcription is inhibited. d. When the inducer binds to the repressor, the shape of the repressor is changed. e. The repressor has binding sites for both DNA and the inducer.