Bio Unit 1- The Molecules of Life

The three molecular components all monomers of DNA have

• Deoxyribose sugar, phosphate group, tRNA

• Deoxyribose sugar, phosphate group, nitrogenous base

• Deoxyribose sugar, phosphate group, mRNA

• Deoxyribose sugar, nitrogenous base, nucleotides

• Deoxyribose sugar, nitrogenous base, amino acids

What makes the 4 nucleotides unique?

• Different phosphate groups

• Different nitrogenous bases (A, T, G, C)

• Different nitrogenous bases (A, U, G, C)

• Nothing, they are the same

• Different deoxyribose sugars

What is a "strand" of DNA? There are two of these strands in DNA.

• Nucleotides bound together by covalent bonds (= polynucleotide chain)

• Nucleotides bound together by hydrogen bonds (= polynucleotide chain)

• Nucleotides

• Amino acids

• Deoxyribose sugar, phosphate group, and nitrogenous base

The DNA double helix looks like a twisted ladder. What makes of each rung of the ladder and what holds the runs together (the sides)?

• Rungs/steps = Nitrogenous bases + phosphate

  Sides = sugar

• Rungs/steps = Nitrogenous bases

  Sides = sugar + phosphate

• Rungs/steps = sugar + phosphate

  Sides = Nitrogenous bases

• Rungs/steps =

  Nitrogenous bases + sugar

  Sides = phosphate

What bases have 2 hydrogen bonds?

• C and T

• C and G

• A and T

• A and U

• G and A

What bases have 3 hydrogen bonds?

• A and U

• A and T

• C and G

• T and C

• T and G

What flimsy bonds hold the nitrogenous bases together?

• Covalent

• Hydrogen

• Peptide

What stiff bonds hold the phosphate group and deoxyribose sugar together and to the nitrogenous base?

• Covalent

• Hydrogen

• Peptide

What kinds of bonds hold the sugar, phosphate, and nitrogenous base together?

• Covalent

• Hydrogen

• Peptide

Monomer of DNA

• Amino acic

• R-group

• Nucleotides