Multiple choice. 1. Nucleotides are the building blocks of DNA and RNA molecules. How is RNA different to DNA? (A). RNA molecules contain the nitrogenous base (B).

Multiple choice.

1. Nucleotides are the building blocks of DNA and RNA molecules. How is RNA different to DNA?
(A). RNA molecules contain the nitrogenous base
(B). uracil and a deoxyribose sugar.
uracil and a ribose sugar
(C). thymine and a ribose sugar.
(D). thymine and a deoxyribose sugar.

2
The monomers of carbohydrates
(A). are joined by glycosidic bonds to form polypeptides.
(B). alwavs contain a ribose sugar bound to a phosphate
(C). are joined by peptide bonds to form polysaccharides.
(D).are joined by glycosidic bonds to form polvsaccharides

3. Which two groups of macromolecules play a major role in energy storage in eukaryotes?
(A). Proteins & Carbohydrates
(B). Carbohydrates & Lipids
(C). Nucleic Acids & Proteins
(D). Lipids & Nucleic Acids

4
The exterior of the phospholipid bilayer of a membrane is
(A). hydrophilic.
(B). solid.
(C).hydrophobic.
(D). aqueous.

5. A small, charged molecule moving against its concentration gradient will most likely cross the cell
membrane via
(A). active transport.
(B). diffusion.
(C). osmosis.
(D). facilitated diffusion.

6.
Life is divided into three domains: Eukarya, Archaea and Bacteria. Which of the following best describes how they are related?
(A). Eukarya evolved from Archaea, which in turn evolved from Bacteria
(B). Eukarya are more closely related to Archaea than they are to Bacteria
(C). Archaea are the common ancestor of both Eukarya and Bacteria.
(D). Archaea and Bacteria share a different common ancestor to Eukarva

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