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LekaFEV [45]
3 years ago
15

Compare and contrast a cell membrane and cell wall

Biology
1 answer:
ki77a [65]3 years ago
6 0
Cell wall: strong, ridgid, gives a plant cell its rectangular structure, green, non permeable, only in plants, 1st layer of plant cell

Cell membrane: weak membrane surrounding animal cell, 1st layer of animal, second in plant, whiteish clear color, semi permeable, in both plants and animals,

Both: organelle, in plant cells, made of cellulose
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MakcuM [25]
The complete question goes like this :
 <span>Almost every major city in the world has a zoo. Humans have kept and enjoyed animals since the prehistoric times. Ancient Greeks and Romans kept small zoos. Over the past fifty years, zoos have changed remarkably. Today zoos provide the animals with larger and more natural habitats.
</span><span>Which sentence could be added to the passage as a supporting detail?

</span>The correct answer is <span>A) Zoos also provide great research facilities
This sentence is adding more information directly related to the state of the zoo in modern times. Besides the educational and entertaining purposes, the zoos are now becoming important centres for research and places for developing conservation strategies for endangered animals. All of the other sentences are not relevant to the importance and characteristic of modern-day zoos. </span>
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4 years ago
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NEED HELP ASAP! 20 PTS AND BRAINLIEST TO CORRECT ANSWER
Diano4ka-milaya [45]
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6 0
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WILL GIVE BRAINLIEST!! Tamara puts a drop of red food dye into a glass of water. The dye makes swirls of
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Prior to its export from the nucleus, what modifications must be made to a mRNA molecule in eukaryotic cells?
mamaluj [8]

Answer: Option A

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Before the mRNA which has been processed from DNA is taken and transported to the ribosomes in the cytoplasm for the translation process, some modifications are made to the mRNA before transport. This includes

1. Capping: addition of 5'-5' phosphate bonds to the 5' terminus of the mRNA. Forms the cap structure that is essentials for binding to ribosomes via special proteins attached to the cap structure

2. Addition of poly(A) tail: a poly(A) addition signal (AAUAAA) is attached to the 3' terminus of the mRNA. They are important in translation initiation and degradation prevention

3. Splicing: this is likely the most remarkable processing in eukaryotes. It involves the removal of intron regions by excision from the present-mRNA and then ligating the exon regions together giving rise to the mRNA.

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