Answer:
The correct option is the A
Explanation:
Like oxygen is more electronegative than hydrogen, it attracts electrons stronger than hydrogen. Therefore the two covalent bonds are polar.
The option b is incorrect because if oxygen and hydrogen had similar electronegativities, they would form no-polar bonds.
The option c is incorrect because oxygen is more electronegative than hydrogen (you can check that in a periodic table).
The options d and e are incorrect because the molecular size or hydrophilic don't influence the type bond.
The level is 1.59 of natural forest
The word elliptical refers to regular ovals.
When NAD becomes NADH, it is being reduced and gaining chemical energy.
Nicotinamide adenine dinucleotide (NAD), a coenzyme, can exist in two forms, NAD⁺ (oxidized) and NADH (reduced form).
Electrons and protons released in catabolism reactions are attached to NAD⁺. The conversion of NAD⁺ to NADH is important reaction for production of ATP during the cellular respiration.
Reduction is lowering oxidation number because element, ion or compound gain electrons.
Chemical equation for reaction of reduction of NAD⁺ (see picture below):
NAD⁺ + 2e⁻ + H⁺ → NADH
Nicotinamide adenine dinucleotide (NAD) is made of two nucleosides joined by pyrophosphate.
More about reduction :brainly.com/question/25334331
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They can probably use those radioactive measuring things. But they will still use proper caution around it.