Answer: a. tRNA
Explanation: The transference RNA is a nucleic acid that participates of the protein synthesis. tRNA is a small RNA with folding as a trefoil. The tRNA has a site where aminoacid is loaded and a anticodon site that is complementary to the codon in the mRNA, ensuring the proper aminoacid sequence in the resulting polypeptide.
Characteristics of Living Organisms: Ability to reproduce independently, ability to grow
Characteristics of Viruses: Not made of cells, have a protein coat instead of a membrane.
Characteristics of Both: Can have a DNA genome, may mutate and evolve
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Aquaporins would be expected to increase in numbers when there is an insufficient amount of water present in the blood.
Aquaporins are a type of proteins which are present in the integral membrane of the cells. They act as channels and help in the transport of water and small solutes across the membrane.
Whenever there is insufficient amount of water present in the blood, the antidiuretic hormone or the ADH responds. The aquaporins increase in number in the blood. They allow the transcellular reabsorption of water. Due to this fact, more water is able to escape from the collecting tubules and enter the blood.
To learn more about aquaporins here
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D. <span>They all contain carbon as an important part of their structure. Hope this helps you!! =')</span>