Which of the following is false about fMet-tRNAf, the initiator tRNA. a. fMet-tRNAf has a formylated amino group on a methionine residue which blocks the free NH2 group, preventing the initiator tRNA from participating in chain elongation.
b. fMet-tRNAf is only used for initiation, recognizing the codons AUG or GUG and occasionally UUG. fMet-tRNAf does not respond to internal AUG codons on an mRNA molecule.
c. the last two bases in the stem of fMet-tRNAf do not form base pairs as in all other tRNAs which prevent it from participating in elongation. Mutations that create base pairs in this region allow it to function in elongation.
d. a series of 3 G-C pairs in the stem of the loop containing the anticodon is exclusive to fMet-tRNAf. Mutations in these base pairs prevent the fMet-tRNAf from being inserted into the P site of the ribosome.
e. none of the above.

What is the "great pacific garbage patch"? a large area of marine debris concentrated by rotating ocean currents a large area around the pacific rim where debris collects from natural disasters such as tsunamis an area in the pacific ocean where trash is intentionally dumped due to lack of landfill availability a large trash dump located in hawaii

What makes the results of a scientific experiment accurate? a) having multiple trials b) lacking any supporting data c) working in a lab d) using a hypothesis that is always true

To answer this question, researchers studied populations of the dusky salamander (desmognathus ochrophaeus) living on different mountain ranges in the southern appalachian mountains. the researchers tested the reproductive isolation of pairs of salamander populations by leaving one male and one female together and later checking the females for the presence of sperm. four mating combinations were tested for each pair of populations (a and b)—two within the same population (female a with male a and female b with male b) and two between populations (female a with male b and female b with male a). the proportion of successful matings for each mating combination was measured. for example, when all the matings of a particular combination were successful, the researchers gave it a value of 1; when none of the matings were successful, they gave it a value of 0. then the researchers calculated an index of reproductive isolation that ranged from 0 (no isolation) to 2 (full isolation). the reproductive isolation value for two populations is the sum of the proportion of successful matings of each type within populations (aa + bb) minus the sum of the proportion of successful matings of each type between populations (ab + ba). the table provides data for the geographic distances and reproductive isolation values for 27 pairs of dusky salamander populations.