Polar covalent bonds are formed when the electrons in the bond are not shared equally between the two nuclei. Which one of these molecules contains polar bonds?
(a) molecular oxygen
(b) methane
(c) propane
(d) water
(d)
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This portion of the graph shows the free energy of the reactants
a. A b. B c. C d. W + X e. Y + Z
Which protozoan group consists solely of parasitic forms?
A) apicomplexans B) ciliates C) flagellates D) amoebas
Which group of gymnosperms resembling small palms produce pollen and gametophytes on separate male and female plants, are usually pollinated by beetles?
A. Ginkgos B. Gnetophytes C. Ferns D. Cycads E. Ephedras
A man and his sister are both affected with a mitochondrial disorder. Because the sister has two children who also have the disorder, the man is concerned about the possibility of also having children with the disorder. What is the estimated risk for each pregnancy of this man producing a child with the same mitochondrial disorder that he has if his wife does not have a mitochondrial disorder?
A. 100% B. 50% C. 25% D. 0%