Unit 1 MCQ Review

Palmitic acid, because the absence of carbon-carbon double bonds allows the molecules to pack closely together; double bonds increase fluidity, which is why unsaturated fats are liquid

Based on the molecular structures shown in the figure, which molecule is likely to be solid at room temperature?

Both are polymers of nucleotides and both are made of nucleotides consisting of a pentose sugar, a phosphate in their backbone, and nitrogenous base, and go from 5' to 3'

Similarities between DNA and RNA

The backbone of DNA contains deoxyribose, whereas the backbone of RNA contains ribose; RNA only has one strand

Which of the following best describes a structural difference between DNADNA and RNARNA?

Hydrogen bonds between molecules at the surface of the water provide surface tension, which allows the water surface to deform but not break under the insect.

Which of the following best describes how the properties of water at an air-water interface enable an insect to walk on the water's surface?

They occur as monomers, chains of monomers, and branched structures. They are linked by covalent bonds, specifically called glycosidic bonds

Which of the following best describes the structures of carbohydrates?

It forms hydrogen bonds.

Which of the following is most directly responsible for water's unique properties?