Why don't steroid hormones bind to transmembrane cell-surface receptors?
A. Steroid hormones don't require receptors
because they bind directly to the cell's DNA.
B. Steroid hormones are not signaling
molecules.
C. Steroid hormones are nonpolar and
therefore cannot bind to receptors.
D. Steroid hormones are nonpolar and cross
the cell's plasma membrane, binding to
receptors inside the cell.
D
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Support for the succession mechanism of tolerance is found in research on plant communities that shows
A. that plants release toxins that prevent other species from establishing. B. succession is random and cannot be predicted by existing species. C. climax communities never form as predicted by Clements. D. succession is determined largely by species that exist in the ground as seeds or old roots. E. competition-tolerant species colonize first.
Which of the following plant adaptations is shared by seedless vascular plants, gymnosperms and angiosperms?
A. Seeds B. Flowers C. Vascular tissue D. Seedless vascular plants, gymnosperms and angiosperms do not share any plant adaptations.
When RNAs separated by electrophoresis are transferred to a membrane and detected using a nucleic
acid probe the result is called a Western Blot. __________________ Indicate whether the statement is true or false.
Linings of the upper respiratory passageways
What will be an ideal response?