Which organelle can be compared to a security guard who decides whom may enter a building and whom may not

During embryonic development of animals, tissue layers form. This process of embryonic tissue development is called Gastrulation.

I am almost 100% positive that the answer is RNA.

Hope this helps!

Final answer:

The substance among amino acid, fat, polysaccharide, and RNA that is a nucleic acid is RNA. Nucleic acids are made up of nucleotides which include DNA, that stores genetic information, and RNA, which translates genetic information into protein.

Explanation:

In answering the question, 'Which substance is a nucleic acid?', we find out that out of amino acid, fat, polysaccharide, and RNA, the nucleic acid is RNA

Nucleic acids are molecules made up of nucleotides that direct crucial cellular activities, such as protein synthesis. A nucleotide consists of three components: a pentose sugar, a nitrogenous base, and a phosphate group. There are two main types of nucleic acids: deoxyribonucleic acid (DNA), which stores genetic information, and Ribonucleic Acid (RNA), that translates the genetic information into protein.

Specifically, RNA contains a pentose sugar (ribose), a nitrogenous base, and a phosphate group, and is involved in various stages and types of protein synthesis, including messenger RNA (mRNA), ribosomal RNA (rRNA), and transfer RNA (tRNA).

Learn more about Nucleic Acid here:

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Correct me if I’m wrong, studying this right now... the answer maybe, pretty sure it’s its, “surface-to-volume ratio decreases as the cell becomes larger”