Class Notes (835,037)
Canada (508,885)
York University (35,167)
Natural Science (2,813)
NATS 1610 (133)
all (20)
Lecture

November The code of life- 2.gene expression and transcription.docx

3 Pages
84 Views
Unlock Document

Department
Natural Science
Course
NATS 1610
Professor
All Professors
Semester
Winter

Description
The code of life-Part 2. Gene Expression and transcription -flow of genetic information: the central dogma-from DNA to RNA to protein -DNA is hereditary material (genetic material) • Passed from one generation of cells to the next • Carries instructions for assembling proteins (in genes) • Genes are segments of DNA that carry information for assembling proteins -Gene expression is the 2-step mechanism by which the information in DNA is used to make proteins -Genes contain the information for making cells and organisms • Structural genes code for polypeptides o Polypeptides are the non-functional primary structures of a protein • Polypeptides becomes functional after they attain their final 3 dimensional structural organization o Secondary, tertiary (and some cases quaternary) structures • The activities of functional proteins o Determine the structure and function of cells • The traits or characteristics of organisms o Are based on the activities of their cells o Which result from the activities of their proteins -To get from DNA to protein requires 2 steps 1. Transcription: a. DNA strand provides template for the synthesis of a complementary RNA strand b. This process synthesizes all types of RNA from DNA templates c. Transcription of a gene produces a messenger RNA (mRNA) molecule d. Transcription occurs in the cell nucleus of eukaryotic cells 2. Translation: a. The information contained in the order f nucleotides in mRNA is used to determine the amino acid sequence of a polypeptide b. Translation occurs at ribosomes, in the cell cytoplasm -A gene is organized unit of DNA sequences that is be transcribed into RNA • Over 90%of all genes are structural genes o Code for messenger RNA (mRNA) o Specifies amino acid sequence of a polypeptide
More Less

Related notes for NATS 1610

Log In


OR

Join OneClass

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

Sign up

Join to view


OR

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.


Submit