A radioactive isotope is an isotope that
A) is stable.
B) decays.
C) has more protons than the common variant of the element.
D) has the same atomic mass but a different atomic number than the common variant of the element.
Answer: B
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The colinearity rule describes rev
A. the correlation between the spatial arrangement of homeotic genes along the chromosome with their expression. B. The correlation between the timing and location of expression of homeotic genes. C. the long stretches of DNA between homeotic gene complexes. D. the parallel arrangement of homeotic genes between different chromosomes. E. the spatial arrangement of alpha helices in proteins encoded by homeotic genes.
In order to prove that a bacterium is pathological according to Koch’s postulates, the ____
a. bacteria must be present in most cases of the disease b. bacteria must be isolated from the infected host and grown in mixed culture c. specific disease must be induced when a pure culture of the bacteria is introduced into a healthy host d. bacteria must be isolated from a transfer host e. bacterium must produce spores that can be transmitted from one individual to another
During an action potential, the membrane potential can reach as high as
a. +30 mV. b. +40 mV. c. +50 mV. d. +60 mV. e. +70 mV.
What causes shifts in the dry and wet seasons of the tropics?
A) Hadley cells B) saturation VP C) ITCZ D) the equatorial low