Which of the following is not true regarding RNA?
A. It has cytosine as one of its four nitrogenous bases.
B. It includes ribose, a 5-carbon sugar.
C. It is double-stranded.
D. It is transcribed in the nucleus and enters the cytoplasm.
Answer: C
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Fimbriae
A. are sloughed off during menstruation. B. enclose the ovary at the time of ovulation. C. assist in the movement of sperm through the female reproductive tract. D. line the ampulla of the uterine tube. E. are extensions of the ovarian ligament.
Valves are important for promoting one-way flow of blood through the heart and some large veins.
Answer the following statement true (T) or false (F)
Parasympathetic effects are localized and short-lived because
A) muscarinic receptors are deactivated by norepinephrine. B) acetylcholine is inactivated at the synapse by acetylcholinesterase. C) norepinephrine hyperpolarizes the postganglionic membrane. D) norepinephrine is inactivated at the synapse by monoamine oxidase. E) epinephrine blocks the muscarinic receptors.
Once threshold is reached, the rising phase of the action potential in pacemaker cells is brought about by the opening of ____-type ____ channels
Fill in the blank(s) with correct word