A polar covalent bond would be most likely to form between
a. atoms with different electronegativities.
b. cations and anions.
c. atoms with ?+ and ?? charges.
d. atoms with filled valence shells.
e. atoms of the same element.
A
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Refer to the paragraph on the Krings et al. paper. Why did the researchers wear protective clothing and note so emphatically that they did so?
A) They needed to be certain there were no ancient pathogens on the sample that modern humans hadn't been exposed to. B) They needed to be sure not to harm the precious sample with oils from skin or moisture from their breath. C) They needed to minimize the chance of introducing their own mitochondrial DNA to the sample. D) They needed to follow careful, standardized laboratory procedures required by law and document their compliance.
Plants do not benefit from insects that prey on their nectar
Indicate whether the statement is true or false
Hemocyanin:a
combines irreversibly with oxygen for transport within the body of various organisms. b. is bright red in color when combined with oxygen. c. has an iron-porphyrin group that is responsible for oxygen transport. d. is a respiratory pigment found in the blood of some invertebrate and vertebrate species. e. is a respiratory pigment that is colorless when deoxygenated.
Which of the following is NOT a phase of the Calvin-Benson cycle?
A. Reduction phase B. Oxidation phase C. Carboxylation phase D. Regeneration phase