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.

Ithink it’s c or b for the answer.

No because the eaeht is on a 23.5 degree axis tilt and so when it is winter the northern hemisphere is pointing away from the sun and the soutubern hemisphere is pointing toward the sun

answer: carbon 14 can only be used to determine the age of the organisms that were once living, and igneous rocks are non living.

explanation:

carbon 14 dating is used to determine the age of the sample by estimating the amount of carbon 14 present in the sample and then comparing it with a reference standard.carbon 14 is a isotope of carbon which is radioactive and unstable. carbon 14 is assimilated by all plants and animals throughout their life from carbon dioxide. however, one the organisms die they stop this assimilation and the carbon 14 content starts to decrease.by knowing how much of carbon 14 is left in an organism after his death, one can estimate the age of the organism. the materials whose age can be estimated by carbon 14 method are the organic compounds. however, some inorganic compounds such as aragonite   shell can also be dated.however, if we consider the igneous rocks it is a non living component which never accumulated carbon 14 in it and thus, we cannot use carbon 14 dating method to estimate its age.