Which of the following is not associated with salutatory propagation?
A. myelation
B. nodes of Ranvier
C. variable concentration of voltage-gated
Na+ and K+ channels along the axon
D. faster signal transmission
E. extremely low threshold potential
E
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A collection of similarly specialized cells and any extracellular material they secrete and maintain describes
(a) an organ. (b) a system. (c) a tissue. (d) organelles.
Answer the following statements true (T) or false (F)
1. In an open circulatory system, there is no difference between blood and interstitial fluid. 2. Relative to closed circulatory systems, Open Circulatory Systems pump hemolymph at relatively high pressure. 3. Blood is typically delivered to respiratory structures at low pressures in closed circulatory systems. 4. Frogs have two atria, but only a single ventricle.
In June 2001 an announcement was made that a draft sequence of the ____________________ nucleotides in the human genome had been finished
a. 350 million b. 990 million c. 1.1 billion d. 3.2 billion e. 56 billion
The poly(A) tail of an mRNA ____
a. is where the start codon is located b. covers the stop codon until it is needed c. protects the mRNA from attack by RNA-digesting enzymes d. is where ribosomes attach at the start of translation e. is where translation terminates