starter
Download
Skip this Video
Download Presentation
Starter

Loading in 2 Seconds...

play fullscreen
1 / 16

Starter - PowerPoint PPT Presentation


  • 153 Views
  • Uploaded on

Starter. Using page 19 first few paragraphs under the prokaryotic cells title work out the answers to the following Give definitions of the terms prokaryotic and eukaryotic cells Which do you think evolved first eukaryotic or prokaryotic cells?. Learning objectives.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Starter ' - gur


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
starter
Starter

Using page 19 first few paragraphs under the prokaryotic cells title work out the answers to the following

  • Give definitions of the terms prokaryotic and eukaryotic cells
  • Which do you think evolved first eukaryotic or prokaryotic cells?
learning objectives
Learning objectives
  • Recall the differences between prokaryotic and eukaryotic cells
  • Describe the differences in the DNA of these cells
  • Create a hypothesis of eukaryotic cell evolution - hwk
bacterial cells prokaryotic
Bacterial cells –prokaryotic
  • Still show all the characteristics of living things
  • Sheet to fill in as we go through the differences in the structure
membrane
Membrane
  • Prokaryotic cells have only one membrane at the surface – cell surface membrane
  • You should be able to put 7 no’s in the prokaryotic column of your table
  • Nuclear membrane, mitochondria, chloroplasts, ER, golgi, nucleus and golgi vesicle
cell wall always present
Cell wall – always present
  • Made of peptidoglycan instead of cellulose
  • Peptidoglycan often called murein
ribosomes always present
Ribosomes – always present
  • Smaller than those of a eukaryotic cell
  • 20nm in prokaryotes (70s)
  • 30nm in eukaryotes (80s)
slide7
DNA
  • In the form of a single loop = circular
  • Eukaryotic DNA is in strands = linear
  • Many prokaryotes have additional loops of DNA called plasmids (not essential for life)
  • In eukaryotic cells histone proteins attach to the DNA strand
  • In prokaryotic cells no histone proteins
  • No nucleus in prokaryotic cells but general area that the main DNA is found is called the nucleoid
energy production
Energy production
  • No mitochondria but energy needs to be released just the same
  • Cell surface membrane has infolded regions called mesosomes
  • Enzymes for respiration
some can photostnthesise
Some can photostnthesise
  • No chloroplasts

Photosynthetic forms do have membraneous vesicles where photosynthetic pigments (chlorophyll molecules) are located. These structures are called thylakoids.

flagella
Flagella
  • Eukaryotic and prokaryotic flagella have different internal structures
  • Function is the same – movement of cell
3 main differences
3 main differences
  • Nucleus
  • DNA
  • Organelles
typical exam questions
Typical exam questions
  • Complete the table to show 3 ways in which prokaryotic and eukaryotic organisms differ in the structure of their cells
slide13
The table below compares the features of typical eukaryotic and prokaryotic cells
  • Complete the table by placing a tick, cross or sometimes present (4)
  • Outline the roles of the golgi apparatus and the ribosomes (2)
slide14
The following table compares some of the features of prokaryotic and eukaryotic animal cells

Complete the table using ticks and crosses

homework on paper
Homework – on paper
  • Mitochondria and chloroplasts contain small loops of DNA. They also contain ribosomes that are the same size as prokaryotic ribosomes.
  • Suggest an explanation for these features
ad