What molecules are involved directly with protein synthesis?

cRNA
mRNA
tRNA
DNA

The simple answer is mRNA, tRNA, and rRNA

Explanation:

The gene (DNA) gets turned into a copy of pre-messener RNA (pre-mRNA). This pre-mRNA get spliced by the splicesome (which contains its own RNA, but this is rarely considered part of the process). The processed mRNA then goes to the ribosome where ribosomal RNA (rRNA) and transfer RNA (tRNA) work together to make the protein.

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.

the last one: artificial selection/genetic engineering

plant breeding is modifying the genetic composition of the plant - but this isn't cloning (which is specifically introducing a gene into a genome). but you are artificially selecting for the phenotype that you want.

the second one is literally genetic engineering - the gene would have been cloned first and then inserted or genetically engineered into the new plant cell (the cotton).