Abase at the first position of an anticodon on the trna would pair with a base at the position of the mrna.

Third

Explanation:

The charged tRNA anticodon consist of three nucleotides and the first nucleotide of anticodon pairs with the third nucleotide of codon of mRNA. This is explained by wobble termed as wobble hypothesis and the first position of an anticodon and third position of codon is called wobble position.

The pairing at third position is a non standard pairing as many different codons are specified by single amino acid. The primary determinants are the first two nucleotides. Thus, a base at the first position of an anticodon on the trna would pair with a base at the third position of the mrna.

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added