Chapter 3 - Cell Structure and Genetic Control-1.pptx

Splicing in the cell nucleus the dna code in

Info icon This preview shows pages 20–25. Sign up to view the full content.

View Full Document Right Arrow Icon
Splicing In the cell nucleus, the DNA code in transcribed into mRNA. Non-coding regions, or introns , are removed during splicing, so that only exons are spliced together in mRNA . Fig 3.17
Image of page 20

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
GENES “CODE FOR” PROTEINS The “triplet code” of DNA determines which amino acid will be placed in each position of the protein via complementary base pairing.
Image of page 21
Transcription of a gene from the DNA template to RNA transcript. RNA triplets are called codons. Fig 3.19 Transcription of DNA to RNA
Image of page 22

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
The codons in mRNA are translated into a sequence of amino acids in a polypeptide. Fig 3.19 Translation of mRNA into Amino Acid Sequence
Image of page 23
Formation of a Polypeptide The anticodons of tRNA bind to the codons of mRNA as the mRNA moves through the ribosome, creating a growing polypeptide chain. Each tRNA detaches from the mRNA. The amino acids carried by each tRNA molecule are joined by peptide bonds to create the polypeptide.
Image of page 24

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
The polypeptide chain grows longer, and its amino acids interact to create its secondary structure. Then it folds and bends to create its tertiary structure. Proteins are either used within a cell or secreted by the cell to a different destination. Proteins to be secreted are sorted in the Golgi apparatus, based on their function and destination. Proteins to be secreted are packaged into vesicles in the Golgi apparatus before secretion. Protein Synthesis
Image of page 25
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern