SUMMATIVE TEST ON NUCLEIC ACIDS

1. Nucleic acids ____________________

• are also called nucleotides.

• do not contain purine.

• are polymers.

• do not contain pyrimidine.

2. A nucleotide is composed of

• an acid, a base and a sugar.

• a base, a sugar, and a phosphate

• a base, and sugar

• an acid, a sugar, and a phosphate

4. All of these are nitrogenous bases of DNA EXCEPT

• Uracil

• Adenine

• Guanine

• Cytosine

3. Which pair is a complementary base pair?

• C-G

• A-G

• A-C

• G-G

5. Which of these statements correctly differentiates RNA and DNA structures?

• The sugar of DNA is pentose while the sugar for RNA is tetrose.

• Thymine can only be found in DNA while Uracil is only present in RNA.

• RNA is double stranded while DNA is single stranded

• Ribose sugar is present in DNA while deoxyribose is found in RNA.

6. The rules which state that in a DNA sample, the amount of the Adenine base is equal to the amount of Thymine base while the amount of the Cytosine base is equal to the amount of Guanine is ______________.

• Chargraff's Rules

• Chargaff's Rules

• Levene's Tetranulceotide Hypothesis

• Levine's Tetranucelotide Hypothesis

7. In humans, there is approximately 30% adenine. What is the percentage of other nitrogenous bases?

• T-30%, C-20%, AND G-20%

• T-40%, C-15%, AND G-15%

• T-50%, C-25%, AND G-25%

• T-60%, C-20%, AND G-20%

8. In DNA, guanine is 10%. The content of adenine is _____.

• 20%

• 30%

• 40%

• 50%

9. DNA profiling is also known as ______________.

• DNA fingerprinting

• RNA fingerprinting

• DNA mapping

• RNA mapping

10. Which of these is NOT a use of DNA profiling?

• crime victim and suspect identification

• paternal testing

• family relationship establishment

• age of a dead organism