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Biomolecules and the Chemistry of Life

Biomolecules and the Chemistry of Life

Biomolecules and the Chemistry of Life: Feeling Starchy True or False

1. An element’s atomic number tells you -> how many neutrons are contained in the nucleus.
2. Lithium is a relatively small atom; its atomic number is 3, and it has three electrons. Two of those electrons are in the first electron shell, which holds a maximum of two electrons, and the last electron is alone in the next shell, which can hold a maximum of eight electrons. If lithium becomes an ion, it is most likely to become -> Li+.
3. When two or more atoms bind by sharing electrons equally, we call it a(n) -> nonpolar covalent bond.
4. Water is a good solvent because -> of options 1, 2, and 3.
5. Usually, the solid phase of a substance is ______ dense than the liquid phase. Water is _______ dense than ice. -> more; less
6. Carbon is the basis for life forms on Earth because -> it can form four bonds, thereby giving rise to a diverse array of molecules.
7. Starch is a(n) _______ storage polysaccharide and is ___________, whereas glycogen is a(n) _______ storage polysaccharide and is ___________. -> animal; branched; plant; branched or unbranched
8. All lipids have the following trait(s) in common: -> both options 1 and 2.
9. The quaternary structure of a protein is -> a string of amino acids forming a polypeptide chain.
10. Nucleotides are made up of -> options 1, 2, and 3.

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