DNA & Gene Expression RETEST

A molecule of DNA is a polymer composed of _____________.

• glucose

• amino acids

• fatty acids

• nucleotides

In all plant and animal cells, the nucleus contains long molecules of DNA. Which of the following best describes the function of DNA?

• DNA provides the shape and structure of the nucleus

• DNA packages materials for transport through the nucleus

• DNA carries materials into and out of the nucleus

• DNA contains the blueprint for producing the cell

What nitrogenous base would bond with thymine in a complimentary strand of DNA?

• uracil

• cytosine

• adenine

• guanine

Where in the cell does DNA replication occur?

• ribosome

• cytoplasm

• vacuole

• nucleus

In a double helix, the two strands of DNA are held together by what type of bonds?

• peptide bonds

• ionic bonds

• hydrogen bonds

• amino bonds

What is one of the roles of DNA polymerase during DNA replication?

• it degenerates the old DNA strand once the new strand is made

• it uses a strand of DNA to build a new strand of RNA

• it joins nucleotides to synthesize a complementary strand of DNA

• it unzips the two strands in a molecule of DNA to begin replication

Each nucleotide is composed of three parts. The picture shows a chain of 4 nucleotides linked together. What is the correct name of the molecule indicated?

• deoxyribose sugar

• nitrogenous base

• phosphate group

• hydrogen bond

Enzymes, which are specialized proteins, help perform the tasks of DNA replication. Which enzyme is responsible for unzipping the two strands of DNA so that replication can take place?

• DNA polymerase

• DNA ligase

• Catalase

• Helicase

Four different nucleotides are used as building blocks of DNA. Which of the following can be used to distinguish one nucleotide from another?

• the nitrogenous base

• the shape of deoxyribose sugar

• the length of the phosphate group

• the type of fatty acid

Which of these will complete the mRNA strand matching the DNA shown?

• C A G

• A U G

• G U C

• U A G