Pre-course 3: Nucleic Acids

What is adenine, guanine, cytosine, thymine?

• Nitrogen bases, which forms DNA

• Nitrogen bases, which forms RNA

• Sugar molecules, which makes up DNA and RNA

• Protein monomers

Which answer describes DNA molecule?

• Double-stranded, contains ribose and A, T, G, C

• Single stranded molecule, contains deoxyribose and A, T, G, C

• Double-stranded, contains deoxyribose and A, U, G, C

• Double-stranded, contains deoxyribose and A, T, G, C

• Single stranded molecule, contains ribose and A, U, G, C

Which sequences are correct?

Denotation: A;T;C;G;U-nitrogen bases; D-deoxyribose, R-ribose;P- phosphoric acid residue.

• A-T-P

• U-R-P

• T-R-P

• A-D-P

• C-D-P

Based on the principle of complementarity two hydrogen bonds connect nitrogen bases A-T.

• Yes

• No

In which phase of cell cycle DNA replication occurs?

• M

• G1

• S

• G2

• G0

In which phase of the cell cycle the metaphase chromosomes are visible in cell?

• M

• G1

• S

• G2

• G0

In which phase of the cell cycle the sister chromatids are formed?

• M

• G1

• S

• G2

• G0

By studying the bacterial DNA molecule, it was found to contain 20% guanine, calculate the remaining nucleotide composition in DNA molecule. What would be the approximate content of adenine?

• 15%

• 20%

• 30%

• 10%