Cell Rap Vids!

Biochemists are truly the cool kids of the science world! so much rap videos on youtube about various biochem topics..i couldn’t resist posting them on my blog! i hope you enjoy them as much as i did.

 

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Cells Quiz

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Sit back, relax, and take the quiz!

1) Which cell feature is responsible for providing energy?

a.Lysosome

b.Mitochondria

c.Endoplasmic reticulum

d.Nucleus

2) Where does replication of DNA take place in the cell?

a.Golgi Apparatus

b. Ribosome

c.Nucleus

d.Nucleolus

3)Which is not a feature of prokaryotes?

a.Cell Membrane

b.Cell Wall

c.Endoplasmic Reticulum

d.DNA

4)Which structure serves to package,process and export proteins in the cell?

a. RER

b.Nucleus

c.Golgi Apparatus

d.Mitochondria

5) What is the phenomenon below?

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a.Apoptisis

b.Enosymbiotic Theory

c.Phagocytosis

d.None of the above

6)What part of the cell manufactures proteins?

a.Ribosomes

b.Nucleus

c.Mitochondria

d.Cytoplasm

7)What feature is responsible for storing water?

a.Lysosome

b.Vacuole

c.Cytoplasm

d.Cell Wall

8)Why is the term ‘nuclear envelope’  used instead of ‘nuclear membrane’?

a. either term is correct

b.the enclosure is composed of two membranes

c. DNA membrane as well as nucleus membrane is considered

d. All of the above

9)Which cell feature transports ribosomes?

a.Cytoplasm

b.ER

c.Golgi Apparatus

d.Chlorophyll

10) Name the structure below:

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a. Chloroplast

b.Golgi Apparatus

c. Circular DNA

d. White blood cell

Cells!

This was the first topic learnt in Biochemistry. Basically what was covered in this lesson was the definition, characteristics and functions of cells, both prokaryotic and eukaryotic. Instead of writing an entire blog explaining this, I decided to post some pictures to make the learning more visual!

Cell: Smallest unit capable of carrying out life functions. The basic unit of structure and function of all organisms.

Size: Smallest free living cell: 0.5×0.5×1.6 μm (this is the dialister pneumosintes bacteria) Any cell smaller than this is unlikely to have sufficient DNA to support enzymes. This sets a LOWER LIMIT on the size of cells. On the other hand, cells cannot be too large becuase as size increases, volume increases hence surface area to volume ratio decreases, and processes such as diffusion takes too long to sustain life.

  • Prokaryotic Vs Eukaryotic Cells

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Eukaryotic Cell Sizes range from 10-100 μm.

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  • Prokaryotic cells lack nuclei and membrane bound organelles

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  • Eukaryotic Cell:

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  • Eurkaryotic Cell vs Prokaryotic Cell:

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Cells..here we go again!

When i saw that Cells was the first topic on the Biochemistry syllabus..i immediately thought, oh no, Cells has come back to haunt me from form 3 straight to A levels.

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However, it was pretty much the same topics as A levels, just more in depth, with a few new interesting concepts. One which i found to be most interesting was Apoptosis.

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Makes you think if structures so small mimic human actions or if us humans show similar characteristics as the basic unit that supports all life. As much as i would like to go on and on about apoptosis, i’d prefer to stick to the biochem syllabus, which brings us to the Endosymbiotic Theroy.

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Wait!…its actually not as complicated as it sounds, dont let the ‘big words’ fool you. The meaning is in the name itself Endo- in Symbio- Living together. Endosymbiotic theory basically states that eukaryotes originated as symbioses between separate single-celled organisms. There is overwhelming evidence in both the chloroplasts and mitochondria to prove this theory. the chloroplasts and mitochondria were once free living prokaryotic cells that were engulfed by eukaryotic cells, now living in a symbiotic relationship.

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If your still confused after that explaination:

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I also found a very cute video explaning this theory as a love story!

Thats all for now folks! Hope this helped you in more than one way.

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References:

riceandbeans.deviantart.com

phoenutria.livejournal.com

http://www.tumblr.com/tagged/cell%20biology