Ultimately, the string of amino acids folds upon itself, adopting the unique shape that is the signature of that particular protein. Connector molecules called tRNA (transfer RNA) aid in this process. Question: Question 1 The building blocks of DNA and RNA are: O Phospholipids O Peptides O Amino acids Nucleotides Question 2 All of the following are true. And as I just said, the building blocks of the proteins are the amino acids. DNA says, well, what contains the information, but a lot of the work of organism is actually done, is actually done by the proteins. Inside every cell, ribosomes read mRNA sequences and hook together protein building blocks called amino acids in the order specified by the code: Groups of three nucleotides in mRNA code for each of 20 amino acids. So proteins, the way at least my brain of it, is they do a lot of the work. An intermediate in this process, called mRNA (messenger ribonucleic acid), is made from the DNA template and serves as a link to molecular machines called ribosomes. DNA's four nucleotides, abbreviated A, T, G, and C, can only match up in specific pairs: A links to T and G links to C. Our genetic identity is "coded" in the sense that four building blocks, called nucleotides, string together to spell out a biochemical message-the manufacturing instructions for a protein. Tucked away inside the DNA of all of your genes are the instructions for how to construct a unique individual. Each amino acid differs in terms of its 'R' group. There are 20 different amino acids commonly found in proteins and often 300 or more amino acids per protein molecule. All amino acids contain an amino or NH 2 group and a carboxyl (acid) or COOH group. Work horses of the cell, proteins serve as structural material, hormones, enzymes and neurotransmitters as well as play many other roles. Amino acids are the building blocks for proteins. Discrete segments of DNA, called genes, encode the instructions for making proteins. Such changes over long time periods provide opportunities for organisms to adapt to new surroundings-or, cause them to die out. Occasionally exposure to toxins or malfunction of cellular processes, among other things, does cause copying mistakes. The building blocks link to form the molecule's famous "double helix" structure, which allows genetic information to be copied and passed down from one generation to the next. Made up of four chemical building blocks called A, C, T and G, for short, DNA contains the instructions for making all living things. The DNA stored in the nucleus of a single human cell spans over six feet in length if stretched from end to end.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |