19. Which of the following statement is not true for genetic codes and tRNA? A. Each amino acid is attached to one tRNA.
B. There are 61 codons specify for 20 amino acids.
© RNAs contain other bases rather than A. G.C and U.
D. Same tRNA may be able to recognize more than one codon.
E. Prokaryotic genetic codes are different from eukaryotic one

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.

Give examples of selective advantage of organism’s body part/organ

Suppose you use three different scale to weigh a bag of organges. one scale says the nag weighs 2.1 lb, and third says it weighs 2.1 lb. the actual weight of the bag of organges is 2.153 lb. which of the following best decribes these results?