IB DP Biology: SL复习笔记2.6.4 Skills: DNA, RNA & Protein Synthesis

Drawing simple diagrams of the structure of single nucleotides of DNA and RNA

• Simple shapes can be used to draw the main building blocks of nucleotides and the DNA double helix
  • Advanced drawing skills are not required!
• Pentagons can represent pentose sugars
• Circles can represent phosphates
  • Often shown as a circle with the letter P inside: ℗
• Rectangles can represent bases
• Covalent bonds can be shown with solid lines
• Hydrogen bonds can be shown with dashed lines
  • Or with complementary shapes that fit together (see diagrams)

Simple shapes can be used to represent parts of nucleotide molecules

Two nucleotides shown bonded together covalently within a strand

When drawing the base pairing, the opposite strand should be antiparallel to the first. The presence of hydrogen bonding is shown, but the numbers/lengths of bonds is not required

An alternative way to draw a DNA strand is to use complementary shapes for the bases