intro to module

Question 1

key concepts

Answer 1

-genes codes for proteins
-information flows from:
=genes to proteins
=RNA to DNA
-DNA is transcribed to produce RNA (transcription)
-eukaryotic pre-mRNA transcripts are processed prior to translation
-the information in mRNA is translated into proteins
-polypeptides can be modified or transported during or after translation

Question 2

DNA is a double helix

Answer 2

-the B-form of DNA is a double helix
-consists of two polynucleotide chains that run antiparallel
-has a major (wide) groove and minor (narrow groove

Question 3

DNA nitrogenous bases

Answer 3

-purine
-pyrimidine
-face inward and pair by:
= A-T
= G-C

Question 4

nucleoside consists of:

Answer 4

a purine or pyrimidine base linked to the 1’ carbon of a pentose sugar

Question 5

pyrimidine

Answer 5

1-carbon nitrogen ring bases:
=cytosine
=thymine

Question 6

purine

Answer 6

2-carbon nitrogen ring bases:
=adenine
=guanine

Question 7

difference between RNA and DNA structure ?

Answer 7

-DNA has a deoxyribose sugar at its 2’ position (2-H)
-RNA has a ribose sugar at its 2’ position (2-OH)