13. In which step of protein synthesis does the rRNA make protein? 14. What does transfer RNA, or tRNA, carry on them?
15. What do chains of amino acids build?
16. What is the role of tRNA?
17. How many bases does one molecule of tRNA read at one time?
18. Where is a codon located?
19. Where is the anticodon located?
20. What tool is used to predict what amino acid will be brought to the rRNA?
21. What type of bond holds amino acids together?
22. What indicates that the protein building is finished?
23. Ultimately, what molecule was the director of the entire protein building?

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!

the correct answer is d