Cfe Higher Biology Unit 1 KA 1-3

Who were the two scientists that explained the structure of the DNA molecule for the first time in 1953?

• Watson and Crick

• Mendel and Morgan

• Darwin and Wallace

• Franklin and Wilkins

What are the components of a nucleotide?

• Phosphate, ribose sugar, and a base

• Phosphate, deoxyribose sugar, and a base

• Phosphate, glucose sugar, and a base

• Phosphate, deoxyribose sugar, and an amino acid

Which of the following is not a base in DNA?

• Adenine

• Thymine

• Guanine

• Uracil

What is the correct pairing of the DNA bases?

• A-T and G-C

• A-G and T-C

• A-C and G-T

• A-A and T-T

According to the base pairing rules, which DNA nucleotide pairs with Adenine (A)?

• Thymine (T)

• Guanine (G)

• Cytosine (C)

• Adenine (A)

How are the strands of DNA oriented relative to each other?

• Parallel

• Antiparallel

• Perpendicular

• Intersecting

What type of bonds hold the two strands of DNA together?

• Ionic bonds

• Covalent bonds

• Hydrogen bonds

• Metallic bonds

What is the backbone of the DNA structure made of?

• Amino acids

• Nucleotides

• Sugar phosphate

• Lipids

Which of the following is not a base pair in DNA?

• Adenine-Thymine

• Guanine-Cytosine

• Cytosine-Adenine

• Thymine-Guanine

What is the directionality of the two strands of DNA?

• Both strands run in the 5' to 3' direction

• Both strands run in the 3' to 5' direction

• One strand runs in the 5' to 3' direction and the other in the 3' to 5' direction

• The directionality of DNA strands is not specific