When under attack, ciliates can eject sticky threads
called
a. vacuoles.
b. trichocysts.
c. cysts.
d. pseudopods.
e. pellicles.
Answer: b
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Which of the following mutations is most likely to cause a phenotypic change?
A) a duplication of all or most introns B) a large inversion whose ends are each in the same region between genes C) a nucleotide substitution in an exon coding for a transmembrane domain D) a single nucleotide deletion in an exon coding for an active site E) a frameshift mutation one codon away from the end of the nontemplate strand
To turn genes off, a regulatory protein called a(n) ________ is bound to a regulatory site so that RNA polymerase is blocked.
A. translator B. operon C. signal molecule D. repressor
What is the function of the epidermis?
A. Secretion of lignin B. Pliable structural support C. Photosynthesis D. Forms protective cover on older stems and roots E. Control of gas exchange and water loss
A signal outside a cell triggers changes in the transcription and translation inside the cell through
A) post-translational editing. B) signal transduction pathways. C) protein breakdown.