For most of their lives, cells are in
a. cytokinesis
b. interphase
c. prophase
d. mitosis
Answer: b. interphase
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Starling's law of the heart states that the heart pumps:a
more forcefully when more blood is delivered to it. b. more rapidly when less blood is delivered to it. c. less forcefully when oxygen-rich blood is delivered to it. d. slower when more blood is delivered to it.
e. slower when norepinephrine is secreted.Which portion of DNA contains the genetic information "read" by the RNA polymerase and transmitted into mRNA?
A) sugar B) backbone C) phosphodiester bond D) base
Each human kidney contains about a million ________, which are the tubular functional units of the kidney.
A. renal medullae B. flame cells C. nephrons D. nephridia E. ureters
Which of the following is considered to be the safest drinking water source?
A- a river B- a lake C- the groundwater D- the ocean E- melted snow