1) Which enzyme untwists the DNA and separates the strands? a) DNA polymerase b) DNA helicase c) DNA ligase d) DNA primase 2) What type of bonds are broken when the strands are separated? a) phosphodiester b) glycosidic c) hydrogen d) peptide 3) Which of the following base pairs occur in DNA? a) A-T b) A-U c) G-C d) G-T 4) Which enzyme connects nucleotides together to form a new strand? a) DNA polymerase b) DNA helicase c) DNA ligase d) DNA primase 5) Where does DNA replication take place in eukaryotic cells? a) cytoplasm b) ribosome c) vacuole d) nucleus 6) Why is DNA replication known as semi-conservative? (choose the best answer) a) two new strands are formed b) half of the original DNA is kept in each new molecule c)  one molecule is made of original DNA only d) one molecule is made of new DNA only 7) Select the differences between RNA and DNA a) DNA contains uracil, RNA contains thymine b) DNA is double stranded, RNA is single stranded c) DNA contains thymine, RNA contains uracil d) RNA contains ribose, DNA contains deoxyribose e) DNA and RNA both contain a pentose sugar f) DNA is a very long molecule, RNA is shorter 8) How is DNA structure suited to function? a) complementary base pair rule ensures accurate copying b) it is a short molecule so it can fit in the nucleus c) it is a very long molecule so that it can carry a lot of genes d) it is coiled so it is compact e) sugar phosphate backbone increases strength f) H bonds are very strong so it is difficult to separate strands 9) If the proportion of adenine in a DNA molecule is 24% what is the proportion of guanine? a) 24% b) 76% c) 26% d) 74% 10) Ribosomes are made from..... a) mRNA and protein b) tRNA c) rRNA and mRNA d) rRNA and protein

Nucleic acid structure & DNA replication

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