If the genetic code contained only three different bases instead of four, and these bases made up 3-base code words (codons), how many different codons would be possible?

27

Explanation:

Genetic code has a different combination of four different bases. Each genetic code is made up of three nucleotides. Therefore, either of the four bases may be present in a genetic code at three different positions. This gives a total of 4^3 = 64 different genetic codes to specify amino acids. If there were only three bases in genetic code, either of the three bases may be present at each position of the triplet codon. This would give a total of 3 x 3 x 3 = 27 different genetic codes to code for different amino acids.

in situ hybridization has been widely used for research applications, including clinical cytogenetics, gene mapping, tumor biology and studies of chromosome evolution.

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.