NUCLEIC ACID

1.Genetic mutations primarily occur in:

• a) Proteins

• b) RNA

• c) DNA

• d) Nucleus

2.Where does protein synthesis take place within a cell?

 

• a)Nucleus

• b)Mitochondria

• c)Ribosomes

• d)Golgi apparatus

3.The two strands in a DNA double helix are held together by:

• a) Covalent bonds

• b) Hydrogen bonds

• c) Ionic bonds

• d) Phosphodiester bonds

4.Chromatin is composed of:

• a) Nucleic acids and proteins

• b) Nucleic acids only

• c) Proteins only

• d) Lipids and proteins

5.The width of a DNA molecule is approximately:

• a) 15 Å

• b) 3.4 Å

• c) 20 Å

• d) 25 Å

6.Which type of RNA is responsible for carrying amino acids to the ribosome during protein synthesis?

• mRna

• rRNA

• tRNA

• hnRNA

7.The most abundant type of RNA in cells is:

• a) rRNA

• b) mRNA

• c) tRNA

• d) hnRNA

8.Which sugar is found in RNA?

• a) D-ribose

• b) L-ribose

• c) Deoxyribose

• d) None of these

9.Which pyrimidine base contains an amino group at carbon 4?

 

• a) Cytosine

• b) Thymine

• c) Uracil

• d) Adenine

10.Thymidine in DNA:

• a) Can participate in hydrophobic interactions due to its methyl group

• b) Is replaced by uracil in RNA

• c) Normally forms two hydrogen bonds with adenosine

• d) All of the above