"Third-base wobble allows some tRNAs to recognize more than one mRNA codon. Based on this chapter's discussion of wobble, what is the minimal number of tRNA molecules necessary to recognize the following amino acids?" "leucine"

In case of the amino acid Leucine only, there are six different codons (TTA, TTG, CTT, CTC, CTA, CTG) that the tRNA can recognize and translate. Since there is only one codon that needs to be translated, only one tRNA is required.

Explanation:

The anti-codon on the tRNA recognizes the complementary bases on the codon, and because of the third-base wobble feature, there isn't a 1:1 ratio between the number of codons present and the anti-codons required.

Hope that answers the question. Have a great day!

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!