DNA and PS

What were the two strains of pneumococcus used in Griffith's experiment?

• A deadly virulent strain (S) and a non-virulent strain (R)

• A heat-resistant strain and a cold-resistant strain

• A strain that could photosynthesize and a strain that could not

• A strain that could ferment lactose and a strain that could not

Who expanded upon the findings of Griffith to demonstrate that DNA is the genetic material?

• Avery, McLeod, McCarthy

• Watson, Crick, Franklin

• Mendel, Darwin, Lamarck

• Hooke, Leeuwenhoek, Pasteur

Who discovered the alpha-helical structure of proteins in the 1940s?

• Erwin Chargaff

• Linus Pauling

• James Watson

• Francis Crick

What did Erwin Chargaff propose in 1950 regarding DNA?

• DNA is a double-helix structure

• DNA has a sugar-phosphate backbone

• Equal amounts of Adenine and Thymine, and equal amounts of Guanine and Cytosine are present in DNA

• DNA is made up of four nucleotides: A, T, G, and C

Who took the infamous X-ray diffraction image of DNA in 1951?

• Linus Pauling

• Erwin Chargaff

• Rosalind Franklin

• James Watson

In 1953, who discovered that DNA is made up of four nucleotides: A, T, G, and C?

• Linus Pauling

• Erwin Chargaff

• Rosalind Franklin

• Watson and Crick

Which of the following base pairs are correctly matched according to the base-pairing rules?

• Adenine bonds with Cytosine

• Guanine bonds with Thymine

• Adenine bonds with Thymine

• Thymine bonds with Guanine

What type of backbone does DNA have?

• Protein backbone

• Lipid backbone

• Sugar-phosphate backbone

• Carbohydrate backbone

How is DNA arranged?

• Single-stranded structure

• Triple-helix structure

• Double-helix structure

• Quadruple-helix structure

What are the monomers that make up DNA called?

• Amino acids

• Nucleotides

• Fatty acids

• Monosaccharides