In this depiction of transcription, the ____
strand is ____ because it ____.
a. upper; RNA; is single-stranded.
b. lower; RNA; contains uracil.
c. lower; RNA; contains thymine.
d. upper; RNA; has no uracil (U).
e. lower; DNA; contains adenine (A).
B
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Self-assembly has been utilized or potentially may be used for all of the following applications except
A) nanotechnology. B) electrical conductivity. C) biosensors. D) drug delivery systems. E) All of the above are examples.
The above figure is a photomicrograph of what kind
of tissue? a. cardiac muscle b. skeletal muscle c. nerve tissue d. cartilage e. dense connective
In mammalian females, which of the following is a structure essential for reproduction?
a. the urethra b. the anus c. the uterus d. the stomach
Why did the smooth muscle in cultured strips of aorta not respond to acetylcholine by relaxing, while the smooth muscle of aortic rings did?
a) The endothelial layer in aortal strips was abnormally thickened, while in aortal rings it was not. b) Acetylcholine in the strips could not penetrate to the muscle cells while in the rings it could. c) Smooth muscle cells in aortic strips are physically incapable of relaxing under any circumstances. d) The delicate endothelial layer in aortal strips had been rubbed away during dissection, while in aortal rings it remained intact. e) Smooth muscle cells in aortic rings express acetylcholine receptors, while those in strips do not.