Subsidiary cells are the only epidermal cells that have chloroplasts
____________________ Indicate whether the statement is true or false.
F, Guard cells
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Suppose sugar is taken out of an excretory system tubule and back into the blood. This would be an
example of
a. reabsorption. b. release. c. filtration. d. secretion. e. diffusion.
What defines a geological time period known as an era?
A) Location of the continents B) The distinct life forms that were present C) Average global temperature D) The eras represent equal divisions of time
The "gap" phases of the cell cycle are devoted to:
A) DNA replication. B) creating new nuclei. C) normal cell operations, growth, and preparation for cell division. D) moving chromosomes to their correct positions.
Which of the following is not a characteristic of a riboswitch?
A. They are structures that can form in the 5' untranslated region of some mRNA molecules. B. They exert gene expression control only at the level of translation. C. They may physically bind to small-molecule metabolites. D. Ligand-binding to a riboswitch may sequester the Shine-Dalgarno sequence.