Class Notes (838,681)
Canada (511,043)
BIOL 1412 (89)

BIOL1412 02 07 2014.docx

4 Pages
Unlock Document

Biological Sciences
BIOL 1412
Paul Messing

BIOL1412 02 07 2014 Topic 5: Cell Physiology IV Cell - living building blocks of body (Fig. 3.2) (Fig. 3.1) - chem. processes in body (performed by cells) = metabolism anabolism - building mol.s catabolism - breakdown of mol.s Basic Cell Processes 1) Protein Synthesis - enzymes, etc. a) DNATranscription - DNA⇒ mRNA (messenger RNA) (Fig. 3.37) - steps: i) DNAuncoils at site of gene to expose gene base sequence ii) RNAstrand is formed using code on DNAtemplate to add complimentary RNAmol.s eg. DNAtemplateA-T-C-G-C-A mRNA U-A-G-C-G-U b) DNATranslation - mRNA⇒ proteins - steps: i) mRNA associates w/ ribosomes ⇒ 3 bases on mRNA= base triplet = a codon eg. CUU,ACG, etc. ⇒ each codon codes for 1 amino acid (aa's can have more than one codon) (Fig. 3.39) ii) transfer RNA(tRNA) w/ specific aa and anticodon (comp. bases to codon) binds to matching RNA iii) peptide bind is formed to attach aa to growing peptide chain (Fig. 3.37) - so overall: sequence of DNAbases determine mRNAsequences ⇒ determines aa sequence for protein c) After Translation - proteins produced on free ribosomes - released into cytosol or go to nucleus + mito. - proteins produced by ribosomes on ER (RER) - released into ER lumen ⇒ modified by addition of sugars (glycoprotein) (Fig. 3.2) ⇒ transferred to Golgi complex in vesicles (Fig. 3.19) i) further modified by card changes/additions (act as address to send them to right destination: (Fig. 3.20) cell membrane, secretion, lysosomes) ⇒ Lysosomes: ⇒ membrane-bound organelles containing digestive enzymes (acid env't) Enzymes (names end in "ase") - ⇑ Rx rates - not used
More Less

Related notes for BIOL 1412

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.