The word eukaryotic refers specifically to a cell containing
a. photosynthetic membranes.
b. a true nucleus.
c. a cell wall.
d. none of the above.
d
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Actinoplanetes have extensive ________ mycelia.
Fill in the blank(s) with the appropriate word(s).
The cytoskeleton
A. helps maintain cell shape. B. anchors organelles. C. provides architectural support. D. functions in movements of the cytoplasm. E. All of the choices are correct.
Which term is incorrectly matched to its description?
A) Hydrophilic: Substances which readily dissolve in water B) Hydrophobic: Substances which are not readily dissolved in water C) Amphipathic: Has properties that are neither hydrophilic nor hydrophobic; hydrophilic: substances which readily dissolve in water; AND hydrophobic: substances which are not readily dissolved in water are all incorrectly matched D) Amphipathic: Has properties that are neither hydrophilic nor hydrophobic E) Hydrophilic: Substances which readily dissolve in water AND hydrophobic: substances which are not readily dissolved in water are both incorrectly matched.
Which of the following statements about transcriptional regulators is false?
(a) Transcriptional regulators usually interact with the sugar–phosphate backbone on the outside of the double helix to determine where to bind on the DNA helix. (b) Transcriptional regulators will form hydrogen bonds, ionic bonds, and hydrophobic interactions with DNA. (c) The DNA-binding motifs of transcriptional regulators usually bind in the major groove of the DNA helix. (d) The binding of transcriptional regulators generally does not disrupt the hydrogen bonds that hold the double helix together.