2GENBIO2 - MOLECULAR STRUCTURE OF DNA, RNA AND PROTEINS

Multiple Choice

Which of the following are the building blocks of nucleic acids?

• Amino acids

• Nucleotides

• Fatty acids

• Monosaccharides

Open Ended

Explain how the structural differences between DNA and RNA relate to their functions in the cell.

Multiple Select

Which of the following are components of a nucleotide?

• Phosphate group

• Pentose sugar

• Nitrogenous base

• Fatty acid

Multiple Choice

What is the main difference between the pentose sugars found in DNA and RNA?

• DNA has ribose, RNA has deoxyribose

• DNA has deoxyribose, RNA has ribose

• Both have the same sugar

• DNA has glucose, RNA has fructose

Multiple Choice

Which of the following statements is true about polymers based on the given definition and diagram?

• Polymers are made of a single repeating unit.

• Polymers are made up of different molecules joined randomly.

• Polymers are long chain molecules made up of repeating monomers.

• Polymers cannot be broken down into smaller units.

Multiple Choice

What type of bond links the two strands of DNA together?

• Ionic bond

• Hydrogen bond

• Covalent bond

• Peptide bond

Multiple Choice

Which base pairs with adenine (A) in DNA according to Chargaff’s rule?

• Thymine (T)

• Cytosine (C)

• Guanine (G)

• Uracil (U)

Multiple Choice

Which statement best describes the directionality of polynucleotides?

• They have a 5' to 3' directionality.

• They have a 3' to 5' directionality.

• They have no directionality.

• They can only form circular structures.

Open Ended

Explain the importance of phosphodiester bonds in the structure of nucleic acids.

Labelling

Label the parts of the monomer

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amino group

carboxyl group

side chain

central carbon

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​

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are the ​

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(also called MONOMERS) of ​

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.

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Amino acids

building blocks

proteins