Help, i have some doubts Watch

therecovery
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Report Thread starter 3 years ago
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Hey, guys i was doing some bio revision and I came across some difficulties:

1. what is the significance of 80S and 70S ribosomes in eukaryotes and prokaryotes respectively?
2. compare and contrast mitochondria and chloroplasts
3. how can cell walls be permeable to allow small permeable salts?
4. what is a:
-polysome? chromatin?
5. what are the functions of matrix and cristae within mitochondira?
6. what are the differnces between dna replication and protein synthesis?
7. in monosaccarides, what are cross bridges and what is there importance?
8. why do myosin heads get detached when an atp molecule is attached to mysoin head?


I have more doubts, ill update this post when i find them. im doing this for all my subjects. Ill try and respond to TSR threads within this subject to my fullest ability to help TSR community in the same way that it aids me
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hknobody
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1. what is the significance of 80S and 70S ribosomes in eukaryotes and prokaryotes respectively?
both 70S and 80S ribosomes are for protein synthesis (translation), eukaryotic have a higher density (80S > 70S)

2. compare and contrast mitochondria and chloroplasts
similarities:
both are double membrane
both contain their own genetic material and 70S ribosomes
both have electron transport chain
differences:
functions (respiration v.s. photosynthesis)
structure: (thylakoid v.s. cristae) (presence of chlorophyll) (different enzymes)

3. how can cell walls be permeable to allow small permeable salts?


4. what is a:
polysome?
many ribosomes working on the same mRNA

chromatin?
DNA wrap around histone protein

5. what are the functions of matrix and cristae within mitochondira?
Cristae: increase surface area of inner membrane, for production of ATP
Matrix: contain enzymes for krebs cycle and link reaction

6. what are the differnces between dna replication and protein synthesis?
both purpose and process are different....

7. in monosaccarides, what are cross bridges and what is there importance?
you sure there are cross bridge in monosaccharides? i thought it was a name given when the myosin head binds to their binding site on actin
or do you mean the cross bridges between each strand of cellulose?

8. why do myosin heads get detached when an atp molecule is attached to mysoin head?
the phosphorylation causes conformational change in myosin head
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therecovery
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Thank you so much man.
Sorry im late with this reply.
Ill go through your answers, read more on the Internet and let you know.
Again, many thanks! x

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