Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off
Reading...
Front

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

image

Play button

image

Play button

image

Progress

1/35

Click to flip

35 Cards in this Set

  • Front
  • Back
diameter of DNA helix looking down from top view
20 angstroms
nucleoside
base plus a sugar
RNA nucleoside units
Adenosine
Guanosine
Cytidine
Uridine
DNA nucleosides
deoxyadenosine
deoxyguanosine
deoxycytidine
thymidine
configuration of glycosidic linkage
Beta - above plane of sugar
what is a nucleotide
nucleoside joined to one or more phosphate groups by ester linkage
4 nucleotide units in DNA
deoxyadenylate
deoxyguanylate
deoxycytidylate
thymidylate
what is a nucleotide
nucleoside joined to one or more phosphate groups by ester linkage
4 nucleotide units in DNA
deoxyadenylate
deoxyguanylate
deoxycytidylate
thymidylate
how much space seperates adjacent bases in DNA helix
3.4 angstroms
how many angstroms per repeate/turn of helix
34 angstroms
how many bases per turn of DNA helix
10
definition of a gene
a region of DNA (sometimes RNA) that encodes a specific biological function
genome
total complement of genes in an organism virus or organell
chromosome
multiple-DNA molecules

(have more than one gene on them)
how many bp in e.coli genome
5 x 10^6

5,000,000
how many DNA bp in yeast genome
10 x 10^7

100,000,000
how many DNA bp in human genome
3 x 10^9

3 billion
anomer of sugar in DNA or RNA is always
beta-furanose
how are nucleotides usually named
nucleoside phosphates
oside's for ADENINE
RNA: adenosine

DNA: deoxyadenosine
nucleoside nomenclature for guanidine
RNA: guanosine

DNA: deoxyguanosine
nucleoside nomenclature for cytosine
RNA: cytidine

DNA: deoxycytidine
ribonucleotide nomenclature for adenine
RNA: adenylate AMP

DNA: deoxyadenylate dAMP
What type of bonds are between bases in the DNA helix
hydrogen bonds
what type of symmetry is between base pairs
pseudosymmetry
3 different conformations of the DNA Helix:
ABZ
why are there A B and Z conformations
different puckerings of ribose units
how many bp per turn of

-A DNA
-B Dna
-Z DNA
11 -- A is shorter and fatter

10 -- this is normal DNA

12 -- this is longer an thinner
what are DNA major/minor grooves important for
sequence specific recognition
Supercoiling
writhing/coiling of the DNA helix
what helps strands seperate in DNA replication?
negative supercoiling -- slight underwinding of DNA.
what takes up more space:
-Supercoiled
-Relaxed DNA?
Relaxed
essence of semiconservative replication
parent molecule (2 complementary chains) gives 2 daughter molecules, each containing half of the parent
What are the 2 models for DNA replication:
Conservative: parent chain not present in daughter molecule - its brand new

semiconservative - parent donates half of its chain to two duaghters